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Mendeley Climate Change Library

6
6.0

2019
2019

2019
by
Yangbo Lu; Chunju Huang; Shu Jiang; Jingyu Zhang; Yongchao Lu; Yang Liu

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Deposition of the organic-rich shales of the Wufeng and lowermost Longmaxi formations (late Katian through Hirnantian) occurred in a relatively stable tectonic setting and commenced at approximately 4.5 Myr prior to the end-Ordovician glacial maximum. These organic-rich shales are important because they provide a continuous sedimentary record of high-frequency eustatic changes associated with ice-sheet expansion and shrinkage. Here, we carried out a high-resolution cyclostratigraphic study of...

Topics: Astronomical forcing, Condensed section, Hirnantian glaciation, Organic matter enrichment,...

6
6.0

Apr 27, 2017
04/17

Apr 27, 2017
by
Hisashi Kohashi; Kosuke Sugita; Masaaki Sugihara; Takeo Hoshi

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Efficient methods are proposed, for computing integrals appeaing in electronic structure calculations. The methods consist of two parts: the first part is to represent the integrals as contour integrals and the second one is to evaluate the contour integrals by the Clenshaw-Curtis quadrature. The efficiency of the proposed methods is demonstrated through numerical experiments.

Topics: Physics, Condensed Matter, Numerical Analysis, Materials Science, Computational Physics, Mathematics

Source: http://arxiv.org/abs/1704.08644

1
1.0

Apr 27, 2017
04/17

Apr 27, 2017
by
Sergey Khrapak

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The Gr\"uneisen parameter is evaluated for three-dimensional Yukawa systems in the strongly coupled regime. Simple analytical expression is derived from the thermodynamic consideration and its structure is analysed in detail. Possible applications are briefly discussed.

Topics: Plasma Physics, Physics, Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1704.08517

2
2.0

Apr 27, 2017
04/17

Apr 27, 2017
by
Shubhashis Rana

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When a system is attached to an information reservoir, then its dynamics will be affected by that reservoir. A sequence of bits written on a tape can be considered as an information reservoir. Second law of thermodynamics can be apparently violated for this case. Recently Merhav has derived the second law when a system is connected to a heat bath, work source and information reservoir. He has showed that the extracted work during any time interval is restricted by the change of Shannon entropy...

Topics: Statistical Mechanics, Condensed Matter

Source: http://arxiv.org/abs/1704.08639

0
0.0

Apr 27, 2017
04/17

Apr 27, 2017
by
Anna Levina; J. Michael Herrmann

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We define the Abelian distribution and study its basic properties. Abelian distributions arise in the context of neural modeling and describe the size of neural avalanches in fully-connected integrate-and-fire models of self-organized criticality in neural systems.

Topics: Condensed Matter, Adaptation and Self-Organizing Systems, Nonlinear Sciences, Statistical...

Source: http://arxiv.org/abs/1704.08496

2
2.0

Apr 27, 2017
04/17

Apr 27, 2017
by
M. R. Mahani; A. Mirsakiyeva; Anna Delin

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Conducting polymers have become standard engineering materials, used in manyelectronic devices. Despite this, there is a lack of understanding of the microscopicorigin of the conducting properties, especially at realistic device field strengths. Wepresent simulations of doped poly(p-phenylene) (PPP) using a Su-Schrieffer-Heeger(SSH) tight-binding model, with the electric field included in the Hamiltonian througha time-dependent vector potential via Peierls substitution of the phase factor. We...

Topics: Materials Science, Condensed Matter

Source: http://arxiv.org/abs/1704.08519

1
1.0

Apr 27, 2017
04/17

Apr 27, 2017
by
Nadine Hauptmann; César González; Fabian Mohn; Leo Gross; Gerhard Meyer; Richard Berndt

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C60-functionalized tips are used to probe C60 molecules on Cu(111) with scanning tunneling and atomic force microscopy. Distinct and complex intramolecular contrasts are found. Maximal attractive forces are observed when for both molecules a [6,6] bond faces a hexagon of the other molecule. Density functional theory calculations including parameterized van der Waals interactions corroborate the observations.

Topics: Mesoscale and Nanoscale Physics, Condensed Matter

Source: http://arxiv.org/abs/1704.08466

0
0.0

Apr 27, 2017
04/17

Apr 27, 2017
by
Z. Yang; A. Surrente; G. Tutuncuoglu; K. Galkowski; M. Cazaban-Carraze; F. Amaduzzi; P. Leroux; D. K. Maude; A. Fontcuberta i Morral; P. Plochocka

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III-V nanostructures have the potential to revolutionize optoelectronics and energy harvesting. For this to become a reality, critical issues such as reproducibility and sensitivity to defects should be resolved. By discussing the optical properties of MBE grown GaAs nanomembranes we highlight several features that bring them closer to large scale applications. Uncapped membranes exhibit a very high optical quality, expressed by extremely narrow neutral exciton emission, allowing the resolution...

Topics: Mesoscale and Nanoscale Physics, Condensed Matter

Source: http://arxiv.org/abs/1704.08477

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2.0

Apr 27, 2017
04/17

Apr 27, 2017
by
Alina Mreńca-Kolasińska; Bartłomiej Szafran

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We study graphene quantum point contacts and imaging of the backscattering of the Fermi level wave function by potential introduced by a scanning probe. We demonstrate that - in spite of the Klein phenomenon - interference due to the backscattering at a circular n-p junction induced by the probe potential is visible in spatial maps of conductance as functions of the probe position.

Topics: Mesoscale and Nanoscale Physics, Condensed Matter

Source: http://arxiv.org/abs/1704.08460

1
1.0

Apr 27, 2017
04/17

Apr 27, 2017
by
R. E. F. Silva; Igor V. Blinov; Alexey N. Rubtsov; O. Smirnova; M. Ivanov

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This Letter brings together two topics that, until now, have been the focus of intense but non-overlapping research efforts. The first concerns high harmonic generation in solids, which occurs when intense light field excites highly non-equilibrium electronic response in a semiconductor or a dielectric. The second concerns many-body dynamics in strongly correlated systems such as the Mott insulator. Here we show that high harmonic generation can be used to time-resolve ultrafast many-body...

Topics: Strongly Correlated Electrons, Condensed Matter

Source: http://arxiv.org/abs/1704.08471

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3.0

Apr 27, 2017
04/17

Apr 27, 2017
by
Felix Büttner; Ivan Lemesh; Geoffrey S. D. Beach

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Magnetic skyrmions are topological quasi particles of great interest for data storage applications because of their small size, high stability, and ease of manipulation via electric current. Theoretically, however, skyrmions are poorly understood since existing theories are not applicable to small skyrmion sizes and finite material thicknesses. Here, we present a complete theoretical framework to determine the energy of any skyrmion in any material, assuming only a circular symmetric...

Topics: Materials Science, Condensed Matter

Source: http://arxiv.org/abs/1704.08489

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2.0

Apr 27, 2017
04/17

Apr 27, 2017
by
Awaneesh Singh; Amrita Singh; Anirban Chakraborti

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We present Monte Carlo (MC) simulation studies of phase separation in binary (AB) mixtures with bond-disorder that is introduced in two different ways: (i) at randomly selected lattice sites and (ii) at regularly selected sites. The Ising model with spin exchange (Kawasaki) dynamics represents the segregation kinetics in conserved binary mixtures. We find that the dynamical scaling changes significantly by varying the number of disordered sites in the case where bond-disorder is introduced at...

Topics: Statistical Mechanics, Condensed Matter

Source: http://arxiv.org/abs/1704.08448

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1.0

Apr 27, 2017
04/17

Apr 27, 2017
by
H. Y. Lv; W. J. Lu; J. Y. Li; R. C. Xiao; M. J. Wei; P. Tong; X. B. Zhu; Y. P. Sun

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The electronic and magnetic properties of ZrS2 nanoribbons (NRs) are investigated based on the first-principles calculations. It is found that the ZrS2 NRs with armchair edges are all indirect-band-gap semiconductors without magnetism and the band-gap exhibits odd-even oscillation behavior with the increase of the ribbon width. For the NRs with zigzag edges, those with both edges S-terminated are nonmagnetic direct-band-gap semiconductors and the gap decreases monotonically as a function of the...

Topics: Mesoscale and Nanoscale Physics, Condensed Matter

Source: http://arxiv.org/abs/1704.08459

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3.0

Apr 27, 2017
04/17

Apr 27, 2017
by
S. V. Syzranov; A. V. Gorshkov; V. Galitski

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We study out-of-time order correlators (OTOCs) of the form $\langle\hat A(t)\hat B(0)\hat C(t)\hat D(0)\rangle$ for a quantum system weakly coupled to a dissipative environment. Such an open system may serve as a model of, e.g., a small region in a disordered interacting medium coupled to the rest of this medium considered as an environment. We demonstrate that for a system with discrete energy levels the OTOC saturates exponentially $\propto \sum a_i e^{-t/\tau_i}+const$ to a constant value at...

Topics: Quantum Gases, Condensed Matter, Strongly Correlated Electrons, Materials Science, Mesoscale and...

Source: http://arxiv.org/abs/1704.08442

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0.0

Apr 27, 2017
04/17

Apr 27, 2017
by
Xingran Xu; Ying Hu; Zhidong Zhang; Zhaoxin Liang

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Semiconductor microcavity can host spinor polariton condensates with inherent spin multistabilities and fast spin dynamics, promising novel solid-state optoelectronic spin-logic architectures. Here we present a detailed theoretical study on the steady state phases and elementary excitations of a spinor polariton condensate, motivated by recent experimental advances in realizing such systems. We show that a steady homogeneous spinor condensate can exhibit a unpolarized phase and a polarised...

Topics: Quantum Gases, Condensed Matter

Source: http://arxiv.org/abs/1704.08439

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0.0

Apr 27, 2017
04/17

Apr 27, 2017
by
Alexander Wietek; Michael Schuler; Andreas M. Läuchli

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Tower of States analysis is a powerful tool for investigating phase transitions in condensed matter systems. Spontaneous symmetry breaking implies a specific structure of the energy eigenvalues and their corresponding quantum numbers on finite systems. In these lecture notes we explain the group representation theory used to derive the spectral structure for several scenarios of symmetry breaking. We give numerous examples to compute quantum numbers of the degenerate groundstates, including...

Topics: Strongly Correlated Electrons, Condensed Matter, Quantum Physics

Source: http://arxiv.org/abs/1704.08622

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0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
A. M. Kadigrobov

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The charge transport in a dirty 2-dimensional electron system biased in the presence of a lateral potential barrier under magnetic field is theoretically studied. The quantum tunneling across the barrier provides the quantum interference of the edge states localized on its both sides that results in giant oscillations of the charge current flowing perpendicular to the lateral junction. Our theoretical analysis is in a good agreement with the experimental observations presented in Ref.8. In...

Topics: Mesoscale and Nanoscale Physics, Condensed Matter

Source: http://arxiv.org/abs/1704.08093

0
0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Pascal Neibecker; Markus E. Gruner; Xiao Xu; Ryosuke Kainuma; Winfried Petry; Rossitza Pentcheva; Michael Leitner

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The phase stabilities and ordering tendencies in the quaternary full-Heusler alloys NiCoMnAl and NiCoMnGa have been investigated by in-situ neutron diffraction, calorimetry and magnetization measurements. NiCoMnGa was found to adopt the L2$_1$ structure, with distinct Mn and Ga sublattices but a common Ni-Co sublattice. A second-order phase transition to the B2 phase with disorder also between Mn and Ga was observed at 1160 K. In contrast, in NiCoMnAl slow cooling or low-temperature annealing...

Topics: Strongly Correlated Electrons, Condensed Matter

Source: http://arxiv.org/abs/1704.08100

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0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
N. P. Konstantinidis

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The classical ground state magnetic response of the Heisenberg model when rotationally invariant exchange interactions of integer order q>1 are added is found to be discontinuous, even though the interactions lack magnetic anisotropy. This holds even in the case of bipartite lattices which are not frustrated, as well as for the frustrated triangular lattice. The total number of discontinuities is associated with even-odd effects as it depends on the parity of q via the relative strength of...

Topics: Strongly Correlated Electrons, Condensed Matter

Source: http://arxiv.org/abs/1704.08210

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0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
M Carrillo; J A González; S Hernández; C López; A Raya

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Within an artificial neural network (ANN) approach, we classify simulated signals corresponding to the semi-classical description of Bloch oscillations on a two-dimensional square lattice. After the ANN is properly trained, we consider the inverse problem of Bloch oscillations (BO) in which a new signal is classified according to the lattice spacing and external electric field strength oriented along a particular direction of the lattice with an accuracy of 96%. This approach can be improved...

Topics: Disordered Systems and Neural Networks, Condensed Matter

Source: http://arxiv.org/abs/1704.08346

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2.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Hannah Wayment-Steele; Daan Frenkel; Aleks Reinhardt

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In the standard DNA brick set-up, distinct 32-nucleotide strands of single-stranded DNA are each designed to bind specifically to four other such molecules. Experimentally, it has been demonstrated that the overall yield is increased if certain bricks which occur on the outer faces of target structures are merged with adjacent bricks. However, it is not well understood by what mechanism such `boundary bricks' increase the yield, as they likely influence both the nucleation process and the final...

Topics: Physics, Condensed Matter, Soft Condensed Matter, Chemical Physics

Source: http://arxiv.org/abs/1704.08293

1
1.0

Apr 26, 2017
04/17

Apr 26, 2017
by
G. Baskaran

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We look for unifying aspects behind superconductivity in aromatic hydrocarbon and fullerene family K$_3$X (X: picene, .. p-terphenyl, .. C$_{60}$). Aromatic hydrocarbon molecules support RVB states. Consequent stability (aromaticity) makes them reluctant electron acceptors. We argue that X accepts only two (not all three) electrons from K$_3$ and creates charged RVB's in X$^{2-}$, and becomes a (molecular) Cooper pair box. A weak Josephson coupling between X$^{2-}$ molecules creates a Bose Mott...

Topics: Condensed Matter, Superconductivity

Source: http://arxiv.org/abs/1704.08153

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1.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Osamu Matsuda; Thomas Pezeril; Ievgeniia Chaban; Kentaro Fujita; Vitalyi Gusev

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Absorption of ultrashort laser pulses in a metallic grating deposited on a transparent sample launches coherent compression/dilatation acoustic pulses in directions of different orders of acoustic diffraction. Their propagation is detected by the delayed laser pulses, which are also diffracted by the metallic grating, through the measurement of the transient intensity change of the first order diffracted light. The obtained data contain multiple frequency components which are interpreted by...

Topics: Applied Physics, Materials Science, Physics, Condensed Matter, Optics

Source: http://arxiv.org/abs/1704.08069

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2.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Y. J. Hu; Y. W. Cheung; W. C. Yu; Masaki Imai; Hibiki Kanagawa; Joichi Murakawa; Kazuyoshi Yoshimura; Swee K. Goh

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The quasi-skutterudite superconductors $A_3T_4$Sn$_{13}$ ($A$=Sr, Ca; $T$=Ir, Rh, Co) are highly tunable featuring a structural quantum critical point. We construct a temperature-lattice constant phase diagram for these isovalent compounds, establishing Ca$_{3}$Rh$_4$Sn$_{13}$ and Ca$_{3}$Co$_4$Sn$_{13}$ as members close to and far away from the structural quantum critical point, respectively. Deconvolution of the lattice specific heat and the electrical resistivity provide an approximate...

Topics: Strongly Correlated Electrons, Condensed Matter, Superconductivity

Source: http://arxiv.org/abs/1704.07966

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0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Glenn Moynihan; Gilberto Teobaldi; David D. O'Regan

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In electronic structure methods based on the correction of approximate density-functional theory (DFT) for systematic inaccuracies, Hubbard $U$ parameters may be used to quantify and amend the self-interaction errors ascribed to selected subspaces. Here, in order to enable the accurate, computationally convenient calculation of $U$ by means of DFT algorithms that locate the ground-state by direct total-energy minimization, we introduce a reformulation of the successful linear-response method...

Topics: Strongly Correlated Electrons, Condensed Matter

Source: http://arxiv.org/abs/1704.08076

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0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Alexei Andreanov; Yoav Kallus

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The sphere packing problem is an old puzzle. We consider packings with m spheres in the unit cell (m-periodic packings). For the case m = 1 (lattice packings), Voronoi presented an algorithm to enumerate all local optima in a finite computation, which has been implemented in up to d = 8 dimensions. We generalize Voronoi's algorithm to m > 1 and use this new algorithm to enumerate all locally optimal 2-periodic sphere packings in d = 3, 4, and 5. In particular, we show that no 2-periodic...

Topics: Mathematics, Statistical Mechanics, Condensed Matter, Number Theory, Metric Geometry

Source: http://arxiv.org/abs/1704.08156

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0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Alexandre Belin; Christoph A. Keller; Ida G. Zadeh

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We compute genus two partition functions in two dimensional conformal field theories at large central charge, focusing on surfaces that give the third Renyi entropy of two intervals. We compute this for generalized free theories and for symmetric orbifolds, and compare it to the result in pure gravity. We find a new phase transition if the theory contains a light operator of dimension $\Delta\leq0.19$. This means in particular that unlike the second Renyi entropy, the third one is no longer...

Topics: High Energy Physics - Theory, Strongly Correlated Electrons, Condensed Matter

Source: http://arxiv.org/abs/1704.08250

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0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Michael A. McGuire

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Materials composed of two dimensional layers bonded to one another through weak van der Waals interactions often exhibit strongly anisotropic behaviors and can be cleaved into very thin specimens and sometimes into monolayer crystals. Interest in such materials is driven by the study of low dimensional physics and the design of functional heterostructures. Binary compounds with the compositions MX2 and MX3 where M is a metal cation and X is a halogen anion often form such structures. Magnetism...

Topics: Materials Science, Condensed Matter, Mesoscale and Nanoscale Physics

Source: http://arxiv.org/abs/1704.08225

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Apr 26, 2017
04/17

Apr 26, 2017
by
Hossein Salahshoor; Raj Kumar Pal; Julian J. Rimoli

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A long standing postulate in crystal plasticity of metals is that yielding commences once the resolved shear stress on a slip plane reaches a critical value. This assumption, known as Schmid law, implies that the onset of plasticity is independent of the normal stress acting on the slip plane. We examine the validity of this assumption in single crystal perfect lattices at zero temperature by subjecting them to a wide range of combined normal and shear stresses and identifying the onset of...

Topics: Materials Science, Condensed Matter

Source: http://arxiv.org/abs/1704.08376

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1.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Jaeyun Moon; Benoit Latour; Austin Minnich

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Thermal atomic vibrations in amorphous solids can be distinguished by whether they propagate as elastic waves or do not propagate due to lack of atomic periodicity. In a-Si, prior works concluded that non-propagating waves are the dominant contributors to heat transport, while propagating waves are restricted to frequencies less than a few THz and are scattered by anharmonicity. Here, we present a lattice and molecular dynamics analysis of vibrations in a-Si that supports a qualitatively...

Topics: Materials Science, Disordered Systems and Neural Networks, Condensed Matter

Source: http://arxiv.org/abs/1704.08360

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0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Aleksei A. Sukhanov

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We study the energy spectra of bound states in quantum dots (QDs) formed by an electrostatic potential in two-dimensional topological insulator (TI) and their transformation with changes in QD depth and radius. It is found that, unlike a trivial insulator, the energy difference between the levels of the ground state and first excited state can decrease with decreasing the radius and increasing the depth of the QD so that these levels intersect under some critical conditions. The crossing of the...

Topics: Mesoscale and Nanoscale Physics, Condensed Matter

Source: http://arxiv.org/abs/1704.08058

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0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Yaroslav A. Gerasimenko; Igor Vaskivskyi; Dragan Mihailovic

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The fundamental idea that many body systems in complex materials may self-organise into long range order under highly non-equilibrium conditions leads to the notion that entirely new emergent states with new and unexpected functionalities might be created. In this paper we show for the first time that a complex metastable state with long range order can be created through a non-equilibrium topological transformation in a transition metal dichalcogenide. Combining ultrafast optical pulse...

Topics: Strongly Correlated Electrons, Condensed Matter, Mesoscale and Nanoscale Physics

Source: http://arxiv.org/abs/1704.08149

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Apr 26, 2017
04/17

Apr 26, 2017
by
Tapio Simula

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We consider the inertial mass of a vortex in a superfluid quantum gas. In contrast to the conclusion by Thouless and Anglin, we obtain a vortex mass that is well defined and is determined microscopically and self-consistently by the elementary excitation energy of the kelvon quasiparticle localised within the vortex core. The mass, Magnus force, and Berry phase of the vortex could be measured experimentally in superfluid Bose and Fermi gases using currently available methodologies.

Topics: Quantum Gases, Condensed Matter

Source: http://arxiv.org/abs/1704.08410

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1.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Sooyoung Jang; J. D. Denlinger; J. W. Allen; V. S. Zapf; M. B. Maple; Jae Nyeong Kim; Bo Gyu Jang; Ji Hoon Shim

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The temperature-dependent evolution of the Kondo lattice is a long-standing topic of theoretical and experimental investigation and yet it lacks a truly microscopic description of the relation of the basic $f$-$d$ hybridization processes to the fundamental temperature scales of Kondo screening and Fermi-liquid lattice coherence. Here, the temperature-dependence of $f$-$d$ hybridized band dispersions and Fermi-energy $f$ spectral weight in the Kondo lattice system CeCoIn$_5$ is investigated...

Topics: Strongly Correlated Electrons, Condensed Matter

Source: http://arxiv.org/abs/1704.08247

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0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Benedikt Scharf; Gaofeng Xu; Alex Matos-Abiague; Igor Žutić

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The two-dimensional character and reduced screening in monolayer transition-metal dichalcogenides (TMDs) lead to the ubiquitous formation of robust excitons with binding energies orders of magnitude larger than in bulk semiconductors. Focusing on neutral excitons, bound electron-hole pairs, that dominate the optical response in TMDs, it is shown that they can provide fingerprints for magnetic proximity effects in magnetic heterostructures. These proximity effects cannot be described by the...

Topics: Materials Science, Condensed Matter

Source: http://arxiv.org/abs/1704.07984

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Apr 26, 2017
04/17

Apr 26, 2017
by
Hannah R. Irons; Jorge Quintanilla; Toby G. Perring; Luigi Amico; Gabriel Aeppli

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Clustered quantum materials provide a new platform for the experimental study of many-body entanglement. Here we address a simple model of a single-molecule nano-magnet featuring N interacting spins in a transverse field. The field can induce an entanglement transition (ET). We calculate the magnetisation, low-energy gap and neutron-scattering cross-section and find that the ET has distinct signatures, detectable at temperatures as high as 5% of the interaction strength. The signatures are...

Topics: Strongly Correlated Electrons, Condensed Matter, Mesoscale and Nanoscale Physics, Quantum Physics

Source: http://arxiv.org/abs/1704.08146

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0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Tao Sun

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To date, the Hubbard model and its strong coupling limit, the t-J model, serve as the canonical model for strongly correlated electron systems in solids. Approximating the Coulomb interaction by only the on-site term (Hubbard U-term), however, may not be sufficient to describe the essential physics of interacting electron systems. We develop a more complete model in which all the next leading order terms besides the on-site term are retained. Moreover, we discuss how the inclusion of these...

Topics: Condensed Matter, Superconductivity

Source: http://arxiv.org/abs/1704.08420

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2.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Rangarajan Radhakrishnan; Suzanne M. Fielding

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We study theoretically shear banding in soft glassy materials subject to large amplitude time-periodic shear flows, considering separately the protocols of large amplitude oscillatory shear strain, large amplitude square/triangular/sawtooth strain rate, and large amplitude oscillatory shear stress. In each case, we find shear banding to be an important part of the material's flow response for a broad range of values of the frequency $\omega$ and amplitude of the imposed oscillation. Crucially,...

Topics: Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1704.08332

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1.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Daryoush Nosraty-Alamdary; Jani Kotakoski; Toma Susi

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Recent experiments have revealed the possibility of precise electron beam manipulation of silicon impurities in graphene. Motivated by these findings and studies on metal surface quantum corrals, the question arises what kind of embedded Si structures are possible within the hexagonal lattice, and how these are limited by the distortion caused by the preference of Si for $sp^{3}$ hybridization. In this work, we study the geometry and stability of elementary Si patterns in graphene, including...

Topics: Materials Science, Condensed Matter

Source: http://arxiv.org/abs/1704.08019

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4.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Neil Y. C. Lin; Matthew Bierbaum; Itai Cohen

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By combining confocal microscopy and Stress Assessment from Local Structural Anisotropy (SALSA), we directly measure stresses in 3D quiescent colloidal liquids. Our non-invasive and non-perturbative method allows us to measure forces $\lesssim$ 50 fN with a small and tunable probing volume, enabling us to resolve the stress fluctuations arising from particle thermal motions. We use the Green-Kubo relation to relate these measured stress fluctuations to the bulk Brownian viscosity at different...

Topics: Fluid Dynamics, Physics, Condensed Matter, Statistical Mechanics, Soft Condensed Matter

Source: http://arxiv.org/abs/1704.08400

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Apr 26, 2017
04/17

Apr 26, 2017
by
Daniele De Martino; Andrea De Martino

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We consider the problem of inferring the probability distribution of flux configurations in metabolic network models from empirical flux data. For the simple case in which experimental averages are to be retrieved, data are described by a Boltzmann-like distribution ($\propto e^{F/T}$) where $F$ is a linear combination of fluxes and the `temperature' parameter $T\geq 0$ allows for fluctuations. The zero-temperature limit corresponds to a Flux Balance Analysis scenario, where an objective...

Topics: Physics, Molecular Networks, Condensed Matter, Biological Physics, Disordered Systems and Neural...

Source: http://arxiv.org/abs/1704.08087

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Apr 26, 2017
04/17

Apr 26, 2017
by
P. G. Niklowitz; M. Hirschberger; M. Lucas; P. Cermak; A. Schneidewind; E. Faulhaber; J. -M. Mignot; W. J. Duncan; A. Neubauer; C. Pfleiderer; F. M. Grosche

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In the metallic magnet Nb$_{1-y}$Fe$_{2+y}$, the low temperature threshold of ferromagnetism can be investigated by varying the Fe excess $y$ within a narrow homogeneity range. We use elastic neutron scattering to track the evolution of magnetic order from Fe-rich, ferromagnetic Nb$_{0.981}$Fe$_{2.019}$ to approximately stoichiometric NbFe$_2$, in which we can, for the first time, resolve a long-wavelength spin density wave state. The associated ordering wavevector $\mathbf{q}_{\rm...

Topics: Strongly Correlated Electrons, Condensed Matter

Source: http://arxiv.org/abs/1704.08379

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0.0

Apr 26, 2017
04/17

Apr 26, 2017
by
Ludovic Berthier; Patrick Charbonneau; Daniele Coslovich; Andrea Ninarello; Misaki Ozawa; Sho Yaida

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Liquids relax extremely slowly on approaching the glass state. One explanation is that an entropy crisis, due to the rarefaction of available states, makes it increasingly arduous to reach equilibrium in that regime. Validating this scenario is challenging, because experiments offer limited resolution, while numerical studies lag more than eight orders of magnitude behind experimentally-relevant timescales. In this work we not only close the colossal gap between experiments and simulations but...

Topics: Statistical Mechanics, Condensed Matter, Soft Condensed Matter

Source: http://arxiv.org/abs/1704.08257

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Apr 26, 2017
04/17

Apr 26, 2017
by
Hao Tang; Xiao-Feng Lin; Zhen Feng; Jing-Yuan Chen; Jun Gao; Xiao-Yun Xu; Yao Wang; Lu-Feng Qiao; Ai-Lin Yang; Xian-Min Jin

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Quantum walks, in virtue of the coherent superposition and quantum interference, possess the exponential superiority over its classical counterpart in applications of quantum searching and quantum simulation. A straitforward physical implementation involving merely photonic source, linear evolution network and detection make it very appealing, in light of the stringent requirements of universal quantum computing. The quantum enhanced power is highly related to the state space of quantum walks,...

Topics: Disordered Systems and Neural Networks, Quantum Physics, Condensed Matter

Source: http://arxiv.org/abs/1704.08242

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Apr 25, 2017
04/17

Apr 25, 2017
by
Piotr T. Grochowski; Tomasz Karpiuk; Mirosław Brewczyk; Kazimierz Rzążewski

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We study a binary spin-mixture of a zero-temperature repulsively interacting $^6$Li atoms using both the atomic-orbital and the density functional approaches. The gas is initially prepared in a configuration of two magnetic domains and we determine the frequency of the spin-dipole oscillations which are emerging after the repulsive barrier, initially separating the domains, is removed. We find, in agreement with recent experiment (G. Valtolina et al., arXiv:1605.07850 (2016)), the occurrence of...

Topics: Quantum Gases, Condensed Matter

Source: http://arxiv.org/abs/1704.07707

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4.0

Apr 25, 2017
04/17

Apr 25, 2017
by
Torsten Victor Zache; Aniruddha Chakraborty

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We model quasi-two-dimensional two-electron Quantum Dots in a parabolic confinement potential with rovibrational and purely vibrational effective Hamiltonian operators. These are optimized by non-linear least-square fits to the exact energy levels. We find, that the vibrational Hamiltonian describes the energy levels well and reveals how relative contributions change on varying the confinement strength. The rovibrational model suggests the formation of a rigid two-electron molecule in weak...

Topics: Mesoscale and Nanoscale Physics, Condensed Matter, Quantum Physics

Source: http://arxiv.org/abs/1704.08114

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1.0

Apr 25, 2017
04/17

Apr 25, 2017
by
Jake D. Mehew; Selim Unal; Elias Torres Alonso; Gareth F. Jones; Saad Fadhil Ramadhan; Monica F. Craciun; Saverio Russo

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The combination of graphene with semiconductor materials in heterostructure photodetectors, has enabled amplified detection of femtowatt light signals using micron-scale electronic devices. Presently, the speed of such detectors is limited by long-lived charge traps and impractical strategies, e.g. the use of large gate voltage pulses, have been employed to achieve bandwidths suitable for applications, such as video-frame-rate imaging. Here, we report atomically thin graphene-WS$_2$...

Topics: Physics, Condensed Matter, Instrumentation and Detectors, Applied Physics, Materials Science,...

Source: http://arxiv.org/abs/1704.07642

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Apr 25, 2017
04/17

Apr 25, 2017
by
Xue-Jing Zhang; Peng Chen; Bang-Gui Liu

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The structural, magnetic, and electronic properties of (STO)$_4$/(YTO)$_2$ superlattice consisting of Mott insulator YTiO$_3$ (YTO) and band insulator SrTiO$_3$ (STO) under strain are investigated by the density-functional-theory plus \emph{U} method. It is found that an insulator-metal transition occurs when a compressive strain of 0.2\% is applied. The structural analyses reveal that the presence of metallic state in such superlattices accompanies structural phase transition with restoring of...

Topics: Mesoscale and Nanoscale Physics, Condensed Matter

Source: http://arxiv.org/abs/1704.07687

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Apr 25, 2017
04/17

Apr 25, 2017
by
Christophe Berthod; Ivan Maggio-Aprile; Jens Bruér; Andreas Erb; Christoph Renner

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The copper oxides present the highest superconducting temperature and properties at odds with other compounds, suggestive of a fundamentally different superconductivity. In particular, the Abrikosov vortices fail to exhibit localized states expected and observed in all clean superconductors. We have explored the possibility that the elusive vortex-core signatures are actually present but weak. Combining local tunneling measurements with large-scale theoretical modeling, we positively identify...

Topics: Strongly Correlated Electrons, Condensed Matter, Superconductivity

Source: http://arxiv.org/abs/1704.07685