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Jun 29, 2018
06/18

by
Ville J. Härkönen

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The method of many body Green's functions is used to derive algebraic expressions for the different elastic and thermodynamical quantities such as the free energy, internal energy, entropy, heat capacity, elastic constants (adiabatic and isothermal) and the coefficient of thermal expansion. The perturbation expansion is developed up to third-order and diagrams corresponding to the equations are represented. The present results extend the existing ones by giving expressions for the elastic...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1603.06376

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Jun 29, 2018
06/18

by
A. B. Kuklov; B. V. Svistunov

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In their Letter, Borda, Cai, and de Koning report the results of ab initio simulations of dislocations responsible for the giant plasticity. The authors claim key insights into the recent interpretations of (i) the giant plasticity and (ii) the mass flow junction experiments. The purpose of this Comment is clarifying the role of dislocations in the mass flow in conjunction with explaining that the part (ii) of the claim is misleading.

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1609.06174

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Jun 29, 2018
06/18

by
Andrey Demenev; Sergei Novikov; Daniil Domaretskiy; Andrey Parakhonskii; Mikhail Lebedev

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The correlation function of radiation from a high-quality semiconductor microcavity at the resonant laser excitation demonstrates oscillations with surprisingly long-period and damping times of a nanosecond range. It was shown that the oscillations are not attributed to weak Rabi interaction between long-lived exciton states and intracavity electromagnetic field. The study of a response with high spectral resolution had revealed that the oscillations arise if a spectral position as well as a...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1612.00954

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1.0

Jun 30, 2018
06/18

by
Chang-Jin Lee

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A closed-form expression of the retarded quadratic density response function of a two dimensional non-relativistic electron gas at zero temperature is written in terms of a non-analytic complex function. A careful analysis is made of the mathematical mechanism of exact static features such as vanishing, discontinuity and peaks. Special attention is paid to an ambiguity in treating the phase of the non-analytic complex function.

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1404.3661

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Jun 30, 2018
06/18

by
Igor V. Blinov

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A new method for finding electronic structure and wavefunctions of electrons in quasiperiodic potential is introduced. To obtain results it uses slightly modified Schrodinger equation in spaces of dimensionality higher than physical space. It enables to get exact results for quasicrystals without expensive non-exact calculations. New method tested on one-dimensional quasiperiodic screened Coulomb potential.

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1409.8084

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Jun 30, 2018
06/18

by
Jaewon Choi; Jaeho Shin; Euseong Kim

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The rigid double-torus torsional oscillator (TO) is constructed to reduce any elastic effects in-herent to complicate TO structures, allowing explicit probing for a genuine supersolid signature. We investigated the frequency- and temperature-dependent response of the rigid double-torus TO containing solid 4He with 0.6 ppb 3He and 300 ppb 3He. We did not find evidence to support the frequency-independent contribution proposed to be a property of supersolid helium. The frequency-dependent...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1701.07621

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1.0

Jun 30, 2018
06/18

by
G Ferre; M. C. Gordillo; J. Boronat

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We have studied the ground-state properties of para-hydrogen in one dimension and in quasi-one-dimensional configurations using the path integral ground state Monte Carlo method. This method produces zero-temperature exact results for a given interaction and geometry. The quasi-one-dimensional setup has been implemented in two forms: the inner channel inside a carbon nanotube coated with H$_2$ and a harmonic confinement of variable strength. Our main result is the dependence of the Luttinger...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1702.02335

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Jun 29, 2018
06/18

by
N. Lo Gullo; L. Vittadello; M. Bazzan; L. Dell'Anna

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We investigate, theoretically and experimentally,the properties of diffraction spectra of Fibonacci lattices with arbitrary spacings. We show that, by means of a suitable composition rule, a Fibonacci sequence can be mapped into another one with a different lattice spacing. In this way we are able to define equivalence classes of Fibonacci structures and their generators, namely the Fibonacci sequences from which all the others can be obtained by compostion rule. We show that each class can be...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1601.07499

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Jun 29, 2018
06/18

by
Sergey K. Nemirovskii

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In the paper by Khomenko et al. [Phys. Rev. B \textbf{91}, 180504 (2015)] the authors, analyzing numerically the steady counterflowing helium in inhomogeneous channel flow, concluded that the production term $\mathcal{P}$ in the Vinen equation is proportional to $\left\vert \mathbf{V}_{ns}\right\vert ^{3}\mathcal{L}^{1/2}$ (where $\mathcal{L}$ is vortex line density and $\mathbf{V}_{ns}$ is the counterflow velocity). In present comment we demonstrated that the procedure, implemented by the...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1601.06594

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0.0

Jun 30, 2018
06/18

by
A. I. Volokitin; B. N. J. Persson

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Recently Pieplow and Henkel (PH) (NJP \textbf{15} (2013) 023027) presented a new fully covariant theory of the Casimir friction force acting on small neutral particle moving parallel to flat surface. We compare results of this theory with results which follow from a fully relativistic theory of friction in plate-plate configurations in the limit when one plate is considered as sufficiently rarefied. We show that there is the agreement between these theories.

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1405.2525

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0.0

Jun 29, 2018
06/18

by
Matthew S. Bryan; Timothy R. Prisk; Richard T. Azuah; William G. Stirling; Paul E. Sokol

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We present high-resolution neutron Compton scattering measurements of liquid $^3$He below its renormalized Fermi temperature. Theoretical predictions are in excellent agreement with the experimental data when instrumental resolution and final state effects are accounted for. Our results resolve the long-standing inconsistency between theoretical and experimental estimates of the average atomic kinetic energy.

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1610.09397

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2.0

Jun 29, 2018
06/18

by
Marisa Dusseault; Massimo Boninsegni

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Displacements of atoms and molecules away from lattice sites in helium and parahydrogen solids at low temperature have been studied by means of Quantum Monte Carlo simulations. In the bcc phases of He-3 and He-4, atomic displacements are largely quantum-mechanical in character, even at melting. The computed Lindemann ratio at melting is found to be in good agreement with experimental results for He-4. Unlike the case of helium, in solid parahydrogen there exists near melting a significant...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1612.08006

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2.0

Jun 28, 2018
06/18

by
M. J. Fear; P. M. Walmsley; D. E. Zmeev; J. T. Mäkinen; A. I. Golov

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We have measured the response of a torsional oscillator containing polycrystalline hcp solid $^{4}$He to applied steady rotation in an attempt to verify the observations of several other groups that were initially interpreted as evidence for macroscopic quantum effects. The geometry of the cell was that of a simple annulus, with a fill line of relatively narrow diameter in the centre of the torsion rod. Varying the angular velocity of rotation up to 2\,rad\,s$^{-1}$ showed that there were no...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1508.03947

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0.0

Jun 28, 2018
06/18

by
Tymofiy V. Chagovets

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We report an experimental investigation of the electric response of superfluid helium. Our results confirm the presence of electric potential that appears at the relative oscillatory motion of normal fluid and superfluid components in helium generated by the heater. The resonance of the electric potential was observed in the first four harmonics. A suggested method for the detection of the electric response allows the required resonance peak to be distinguished from spurious signals. Our...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1511.03474

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0.0

Jun 29, 2018
06/18

by
V. V. Zavjalov; S. Autti; V. B. Eltsov; P. J. Heikkinen

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We can pump magnons to a nearly harmonic magneto-textural trap in superfluid $^3$He-B. Using the NMR spectroscopy of levels in the trap we have measured the anisotropic magnon mass and related values of the spin-wave velocities. Based on our measurements we provide values of the Fermi-liquid parameter $F^a_1$.

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1601.04192

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4.0

Jun 27, 2018
06/18

by
E. J. Rugeles; Sebastian Ujevic; S. A. Vitiello

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Kinetic energies of a system of $^4$He are investigated at zero temperature. The multi-weight extension to the diffusion Monte Carlo method is used to implement the Feynman-Hellmann theorem in an effective way. This method allows the quantities of interest to be computed with excellent accuracy. In order to study the importance of symmetry in the kinetic energy calculations, we have considered for the solid phase two guiding wave functions: the Nosanov-Jastrow without boson symmetry and the...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1503.01163

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0.0

Jun 29, 2018
06/18

by
Maurizio Rossi; Francesco Ancilotto

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We perform ab-initio Quantum Monte Carlo simulations of para-hydrogen (pH$_2$) at $T=0$ K confined in carbon nanotubes (CNT) of different radii. The radial density profiles show a strong layering of the pH$_2$ molecules which grow, with increasing number of molecules, in solid concentric cylindrical shells and eventually a central column. The central column can be considered an effective one-dimensional (1D) fluid whose properties are well captured by the Tomonaga-Luttinger liquid theory. The...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1602.03282

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2.0

Jun 30, 2018
06/18

by
Davide E. Galli; Luciano Reatto; Maurizio Rossi

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We have performed a microscopic study of a straight quantized vortex line in three dimensions in condensed $^4$He at zero temperature using the Shadow Path Integral Ground State method and the fixed-phase approximation. We have characterized the energy and the local density profile around the vortex axis in superfluid $^4$He at several densities, ranging from below the equilibrium density up to the overpressurized regime. For the Onsager-Feynman (OF) phase our results are exact and represent a...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1405.7589

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2.0

Jun 29, 2018
06/18

by
A. Arreola-Lucas; J. A. Franco-Villafañe; G. Báez; R. A. Méndez-Sánchez

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Theoretical and experimental results for in-plane vibrations of a uniform rectangular plate with free boundary conditions are obtained. The experimental setup uses electromagnetic-acoustic transducers and a vector network analyzer. The theoretical calculations were obtained using the plane wave expansion method applied to the in-plane thin plate vibration theory. The agreement between theory and experiment is excellent for the lower 95 modes covering a very wide frequency range from DC to 20...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1602.06224

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1.0

Jun 29, 2018
06/18

by
M. C. Gordillo; J. Boronat

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Recent heat-capacity experiments show quite unambiguously the existence of a liquid $^3$He phase adsorbed on graphite. This liquid is stable at an extremely low density, possibly one of the lowest found in Nature. Previous theoretical calculations of the same system, and in strictly two dimensions, agree with the result that this liquid phase is not stable and the system is in the gas phase. We calculated the phase diagram of normal $^3$He adsorbed on graphite at $T=0$ using quantum Monte Carlo...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1604.01273

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1.0

Jun 27, 2018
06/18

by
Yousef Yousefi

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We discuss system with non-isotropic non-Heisenberg Hamiltonian with nearest neighbor exchange within a mean field approximation process. We drive equations describing non-Heisenberg non-isotropic model using coherent states in real parameters and then obtain dispersion equations of spin wave of dipole and quadrupole branches for a small linear excitation from the ground state. In final, soliton solution for quadrupole branches for these linear equations obtained.

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1505.03244

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1.0

Jun 30, 2018
06/18

by
V. P. Mineev

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The magnetic dipole-dipole interaction does not prevent existence of half-quantum vortices in the polar phase of superfluid He-3 which can be stable in uniaxial anisotropic aerogel. Here we discus this exotic possibility. After developing a phenomenological theory of phase transition from the normal to polar superfluid state and then to axipolar superfluid state we calculate the NMR properties of such type superfluids at the rest or under rotation filled by an array either single quantum or...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.2111

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3.0

Jun 28, 2018
06/18

by
Anatoly Kuklov

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A significant accumulation of matter in solid Helium-4 observed during the superflow events, dubbed as the giant isochoric compressibility (or the syringe effect), is discussed within the model of dislocations with superfluid core. It is shown that solid Helium-4 in a contact with superfluid reservoir can develop a bistability with respect to the syringe fraction, with the threshold for the bias by chemical potential determined by a typical free length of dislocations with superfluid core. The...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1507.06966

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0.0

Jun 29, 2018
06/18

by
Jean-Sebastien Gagnon; David Hochberg; Juan Perez-Mercader

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We characterize the influence that external noise, with both spatial and temporal correlations, has on the scale dependence of the reaction parameters of a cubic autocatalytic reaction diffusion (CARD) system. Interpreting the CARD model as a primitive reaction scheme for a living system, the results indicate that power-law correlations in environmental fluctuations can either decrease or increase the rates of nutrient decay and the rate of autocatalysis (replication) on small spatial and...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1612.02318

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0.0

Jun 29, 2018
06/18

by
Riichi Kuwahara; Yoshifumi Noguchi; Kaoru Ohno

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The self-consistent GW{\Gamma} method satisfies the Ward-Takahashi identity (i.e., the gauge invariance or the local charge continuity) for arbitrary energy ($\omega$) and momentum ($\bf q$) transfers. Its self-consistent first-principles treatment of the vertex $\Gamma=\Gamma_v$ or $\Gamma_W$ is possible to first order in the bare ($v$) or dynamically-screened ($W$) Coulomb interaction. It is developed within a linearized scheme and combined with the Bethe-Salpeter equation (BSE) to accurately...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1609.05298

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2.0

Jun 27, 2018
06/18

by
Aniruddha Chakraborty

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We propose an analytical model based on diffusion-reaction equation approach for electrochemical electron transfer reaction, where the rate is limited by the electron transfer process. The electron transfer from an ion in solution to the metal electrode would occur as soon as the energy of the orbital on the ion matches the Fermi energy of the metal and a new ion with more positive charge is formed. Obviously the ion before electron transfer and the new ion, which is formed after electron has...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1505.07614

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1.0

Jun 28, 2018
06/18

by
Anna Eyal; Xiao Mi; Artem V. Talanov; John D. Reppy

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The discovery by Kim and Chan (KC) of an anomalous decrease in the period of torsional oscillators (TO) containing samples of solid $^4$He at temperatures below 0.2 K was initially interpreted as a superfluid-like decoupling of a fraction of the solid moment of inertia from the TO. These experiments appeared to confirm the thirty-year-old theoretical prediction by Chester, Andreev, and Leggett of the existence of a low-temperature Bose-condensed supersolid phase in solid $^4$He. The initial...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1511.03401

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1.0

Jun 30, 2018
06/18

by
Tadashi Hirayama

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The absolute value of the electrical conductivity sigma of elemental metals even at the room temperature range is not well theoretically understood. This is particularly true in multivalent metals. This paper empirically found that sigma=n_{atom}e^2tau0/mG with tau0=hbar/k_{B}T reproduces the observations rather well for many metals as in Fig.1(b)-upper, if G is taken, by guessing to be a summed number of electric bands counted from outer most orbitals. We find by comparative study at the same...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.4247

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1.0

Jun 30, 2018
06/18

by
G. L. Klimchitskaya; V. M. Mostepanenko; Bo E. Sernelius

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The comparison studies of theoretical approaches to the description of the Casimir interaction in layered systems including graphene is performed. It is shown that at zero temperature the approach using the polarization tensor leads to the same results as the approach using the longitudinal density-density correlation function of graphene. An explicit expression for the zero-temperature transverse density-density correlation function of graphene is provided. We further show that the...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.6886

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1.0

Jun 29, 2018
06/18

by
G. E. Volovik

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There are many topological faces of the superfluid phases of $^3$He. These superfluids contain various topological defects and textures. The momentum space topology of these superfluids is also nontrivial, as well as the topology in the combined (${\bf p},{\bf r})$ phase space, giving rise to topologically protected Dirac, Weyl and Majorana fermions living in bulk, on the surface and within the topological objects.

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1602.02595

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1.0

Jun 30, 2018
06/18

by
A. P. Itin; M. I. Katsnelson

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We consider 1D lattices described by Hubbard or Bose-Hubbard models, in the presence of periodic high-frequency perturbations, such as uniform ac force or modulation of hopping coefficients. Effective Hamiltonians for interacting particles are derived using an averaging method resembling classical canonical perturbation theory. As is known, a high-frequency force may renormalize hopping coefficients, causing interesting phenomena such as coherent destruction of tunnelling and creation of...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.0402

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0.0

Jun 28, 2018
06/18

by
N. I. Pushkina

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Formation of fourth-sound shock waves in narrow channels filled with superfluid helium is studied. Physical and mathematical conditions at the surface of discontinuity are established. These conditions differ somewhat from those in case of first- and second-sound waves. The velocity of discontinuity coincides with that of fourth sound. The jumps of temperature and the superfluid velocity are shown to be of the first order as to the pressure jumps.

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1511.04755

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1.0

Jun 30, 2018
06/18

by
I. N. Adamenko; E. K. Nemchenko

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A new method of obtaining the interaction Hamiltonian of phonons at superfluid helium-solid interface is proposed in the work. Equations of hydrodynamic variables are obtained in terms of second quantization if helium occupies a half-space. The contributions of all processes to the heat flux from solid to superfluid helium are calculated based on the obtained Hamiltonian. The angular distribution of phonons emitted by a solid is found in different processes. It is shown that all the exit angles...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1403.5068

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1.0

Jun 29, 2018
06/18

by
Jérémy Bon; Serge Galliou; Roger Bourquin

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This paper brings out results of a measurement campaign aiming to determine the temperature coefficients of synthetic quartz elastic constants at liquid helium temperature. The method is based on the relationship between the resonance frequencies of a quartz acoustic cavity and the elastic constants of the material. The temperature coefficients of the elastic constants are extracted from experimental frequency-temperature data collected from a set of resonators of various cut angles, because of...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1607.04584

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1.0

Jun 30, 2018
06/18

by
A. P. Itin; A. I. Neishtadt

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We consider a single particle tunnelling in a tight-binding model with nearest-neighbour couplings, in the presence of a periodic high-frequency force. An effective Hamiltonian for the particle is derived using an averaging method resembling classical canonical perturbation theory. Three cases are considered: uniform lattice with periodic and open boundary conditions, and lattice with a parabolic potential. We find that in the latter case, interplay of the potential and driving leads to...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1401.0410

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1.0

Jun 30, 2018
06/18

by
G. Stefanucci; Y. Pavlyukh; A. -M. Uimonen; R. van Leeuwen

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We present a diagrammatic approach to construct self-energy approximations within many-body perturbation theory with positive spectral properties. The method cures the problem of negative spectral functions which arises from a straightforward inclusion of vertex diagrams beyond the GW approximation. Our approach consists of a two-steps procedure: we first express the approximate many-body self-energy as a product of half-diagrams and then identify the minimal number of half-diagrams to add in...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1408.6163

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1.0

Jun 30, 2018
06/18

by
Gabriel Gonzalez

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We present a quantum model of space charge limited current transport inside trap-free solids with planar geometry in the mean field approximation. We use a simple transformation which allows us to find the exact analytical solution for the steady state current case. We use our approach to find a Mott-Gurney like behavior and the mobility for single charge carriers in the quantum regime in solids.

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1411.4659

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1.0

Jun 30, 2018
06/18

by
G. Bertaina; M. Motta; M. Rossi; E. Vitali; D. E. Galli

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We compute the zero-temperature dynamical structure factor of one-dimensional liquid $^4$He by means of state-of-the-art Quantum Monte Carlo and analytic continuation techniques. By increasing the density, the dynamical structure factor reveals a transition from a highly compressible critical liquid to a quasi-solid regime. In the low-energy limit, the dynamical structure factor can be described by the quantum hydrodynamic Luttinger liquid theory, with a Luttinger parameter spanning all...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1412.7179

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0.0

Jun 30, 2018
06/18

by
V. D. Lakhno; A. P. Chetverikov

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The nonlinear excitations induced in DNA by external force are considered on the basis of Peyrard-Bishop-Dauxois model. It is shown that such impact can lead to creation of bubbles which can propogate through the molecule. The interaction of such bubbles with an excess electron or hole is considered. The numerical experiments demonstrate the possibility of charge transfer induced by bubbles. The possible applications of the obtained results in nanobioelectronics are discussed.

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1402.1130

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0.0

Jun 28, 2018
06/18

by
Sergey K. Nemirovskii

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The problem of the statistics of a set of chaotic vortex lines in a counterflowing superfluid helium is studied. We introduced a Langevin-type force into the equation of motion of the vortex line in presence of relative velocity $\mathbf{v_{ns}}$. This random force is supposed to be Gaussian satisfying the fluctuation-dissipation theorem. The corresponding Fokker-Planck equation for probability functional in the vortex loop configuration space is shown to have a solution in the form of Gibbs...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1511.01334

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0.0

Jun 29, 2018
06/18

by
H. Ohadi; Y. del Valle-Inclan Redondo; A. Dreismann; Y. G. Rubo; F. Pinsker; S. I. Tsintzos; Z. Hatzopoulos; P. G. Savvidis; J. J. Baumberg

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Tunable spin correlations are found to arise between two neighboring trapped exciton-polariton condensates which spin-polarize spontaneously. We observe a crossover from an antiferromagnetic- to a ferromagnetic pair state by reducing the coupling barrier in real-time using control of the imprinted pattern of pump light. Fast optical switching of both condensates is then achieved by resonantly but weakly triggering only a single condensate. These effects can be explained as the competition...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1603.02830

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1.0

Jun 29, 2018
06/18

by
Edgar Josué Landinez Borda; Wei Cai; Maurice de Koning

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In their Comment [arXiv:1609.06174 (2016)], Kuklov and Svistunov argue that (a) our discussion of the role of basal-plane dislocations in mass-flow junction experiments in our recent Letter (Phys. Rev. Lett. 117, 045301 (2016)) is misleading, (b) our results do not provide new insight into dislocation dissociation nor superfluidity of dislocation cores and (c) our calculations lack control of the numerical data. Here we offer our Reply.

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1611.06227

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4.0

Jun 27, 2018
06/18

by
Henri Alloul

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The NMR technique is quite essential as it permits atomic scale measurements in materials. The aim of this article is to present the main parameters accessible to NMR experiments and to relate them to the electronic properties of simple solids in which electronic correlations are not dominant. It will be shown that in metals the Pauli paramagnetism, that is the electronic density of states is accessible through NMR shift and spin lattice relaxation data. Those permit as well to determine...

Topics: Other Condensed Matter, Condensed Matter

Source: http://arxiv.org/abs/1504.06992

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2.0

Jun 29, 2018
06/18

by
J. T. Devreese

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In the present course, an overview is presented of the fundamentals of continuum-polaron physics, which provide the basis of the analysis of polaron effects in ionic crystals and polar semiconductors. These Lecture Notes deal with "large", or "continuum", polarons, as described by the Fr\"ohlich Hamiltonian. The emphasis is on the polaron optical absorption, with detailed mathematical derivations.

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1611.06122

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2.0

Jun 28, 2018
06/18

by
Wilfried Schoepe

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This comment is on Phys.Rev.Lett. 144, 155302 (2015) by M.T. Reeves, T.P. Billam, B.P. Anderson, and A.S. Bradley "Identifying a superfluid Reynolds number via dynamical similarity" where a new superfluid Reynolds number is introduced. This definition is shown to be useful in the data analysis of the finite lifetime of turbulence observed with an oscillating sphere in superfluid helium at mK temperatures in a small velocity interval $\Delta v =(v-v_c)$ just above the critical velocity...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1506.05003

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1.0

Jun 29, 2018
06/18

by
M. Motta; G. Bertaina; E. Vitali; D. E. Galli; M. Rossi

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We study the response of one-dimensional liquid $^4$He to weak perturbations relying on the dynamical structure factor, $S(q,\omega)$, recently obtained via ab-initio techniques [Phys. Rev. Lett. 116, 135302 (2016)]. We evaluate the drag force, $F_v$, experienced by an impurity moving along the system with velocity $v$ and the static response function, $\chi(q)$, describing the density modulations induced by a periodic perturbation with wave vector $q$.

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1607.05301

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3.0

Jun 27, 2018
06/18

by
Gordon Baym; D. H. Beck; C. J. Pethick

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We calculate the effect of a heat current on transporting $^3$He dissolved in superfluid $^4$He at ultralow concentration, as will be utilized in a proposed experimental search for the electric dipole moment of the neutron (nEDM). In this experiment, a phonon wind will generated to drive (partly depolarized) $^3$He down a long pipe. In the regime of $^3$He concentrations $\tilde < 10^{-9}$ and temperatures $\sim 0.5$ K, the phonons comprising the heat current are kept in a flowing local...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1505.01468

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7.0

Jun 28, 2018
06/18

by
Walter Tarantino

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Predictivity of the Kohn-Sham approach to dynamical problems, when regarded as an initial value problem in a time-dependent density functional framework, is analysed for a class of models for which the argument devised in the work of Maitra et al. (Phys. Rev. A 78, 056501 (2008), arXiv:cond-mat/0710.0018) for the standard electronic many-body problem does not apply. The original argument is here extended and revised. As a result, predictivity for this class of problems seems possible only at...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1506.04602

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0.0

Jun 28, 2018
06/18

by
David Z. Li; R. H. Anderson; M. D. Miller

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We calculate expressions for the state-dependent quasiparticle lifetime, the thermal conductivity $\kappa$, the shear viscosity $\eta$, and discuss the spin diffusion coefficient $D$ for Fermi-liquid films in two dimensions. The expressions are valid for low temperatures and arbitrary polarization. The low-temperature expressions for the transport coefficients are essentially exact. We find that $\kappa^{-1} \sim T \ln{T}$, and $\eta^{-1} \sim T^{2}$ for arbitrary polarizations $0 \le...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1507.02596

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2.0

Jun 28, 2018
06/18

by
Nanette N. Jarenwattananon; Louis-S. Bouchard

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The traditional view of nuclear-spin decoherence in a field gradient due to molecular self-diffusion is challenged on the basis of temperature dependence of the linewidth, which demonstrates different behaviors between liquids and gases. The conventional theory predicts that in a fluid, linewidth should increase with temperature; however, in gases we observed the opposite behavior. This surprising behavior can be explained using a more detailed theoretical description of the dephasing function...

Topics: Condensed Matter, Other Condensed Matter

Source: http://arxiv.org/abs/1506.06331