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2.0

Jun 30, 2018
06/18

by
Feng Li

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Copulas provide an attractive approach for constructing multivariate densities with flexible marginal distributions and different forms of dependence. Of particular importance in many areas is the possibility of explicitly modeling tail-dependence. Most of the available approaches estimate tail-dependence and correlations via nuisance parameters, yielding results that are neither tractable nor interpretable for practitioners. We propose a general Bayesian approach for directly modeling...

Topics: Computation, Statistics, Methodology

Source: http://arxiv.org/abs/1401.0100

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4.0

Jun 30, 2018
06/18

by
Yu-Feng Li

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The medium baseline reactor antineutrino experiment, Jiangmen Underground Neutrino Observatory (JUNO), which is being planed to be built at Jiangmen in South China, can determine the neutrino mass hierarchy and improve the precision of three oscillation parameters by one order of magnitude. The sensitivity potential on these measurements is reviewed and design concepts of the central detector are illustrated. Finally, we emphasize on the technical challenges we meet and the corresponding...

Topics: Physics, High Energy Physics - Experiment, Instrumentation and Detectors

Source: http://arxiv.org/abs/1402.6143

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Sep 22, 2013
09/13

by
Feng-Li Lin

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If cosmological constant is positive, a black hole is naturally described by the Schwarzschild-de Sitter solution with two horizons. We use the global method to extract the topological information and the selection rule for the Gibbons-Hawking temperature for the thermal vacua. These are related to the Euler number of the Euclidean section whose topology is more complicated than expected. We also point out the failure of the usual local method of conical singularity approach in dealing with...

Source: http://arxiv.org/abs/hep-th/9807084v2

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Sep 19, 2013
09/13

by
Feng-Li Lin

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In this note we calculate the Casimir effect of free thermal gravitons in Einstein universe and discuss how it changes the entropy bound condition proposed recently by Verlinde [hep-th/0008140] as a higher dimensional generalization of Cardy's formula for conformal field theories (CFT). We find that the graviton's Casimir effect is necessary in order not to violate Verlinde's bound for weakly coupled CFT. We also comment on the implication of this new Cardy's formula to the thermodynamics of...

Source: http://arxiv.org/abs/hep-th/0010127v2

2
2.0

Jun 29, 2018
06/18

by
Yu-Feng Li

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Both active and sterile sub-eV neutrinos can form the cosmic neutrino background in the early Universe. We consider the beta-decaying (e.g., $^3$H) and EC-decaying (e.g., $^{163}$Ho) nuclei as the promising targets to capture relic neutrinos in the laboratory. We calculate the capture rates of relic electron neutrinos and antineutrinos against the corresponding beta decay or electron capture (EC) decay backgrounds in the (3+$N_{\rm s}$) flavor mixing scheme, and discuss the future prospect in...

Topics: Astrophysics, High Energy Physics - Phenomenology, Cosmology and Nongalactic Astrophysics

Source: http://arxiv.org/abs/1606.04734

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5.0

Jun 27, 2018
06/18

by
Yu-Feng Li

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The existence of the cosmic neutrino background (CnuB) is a fundamental prediction of the standard Big Bang cosmology. Although current cosmological probes provide indirect observational evidence, the direct detection of the CnuB in a laboratory experiment is a great challenge to the present experimental techniques. We discuss the future prospects for the direct detection of the CnuB, with the emphasis on the method of captures on beta-decaying nuclei and the PTOLEMY project. Other...

Topics: High Energy Physics - Experiment, Astrophysics, High Energy Physics - Phenomenology, Cosmology and...

Source: http://arxiv.org/abs/1504.03966

3
3.0

Jun 29, 2018
06/18

by
Yirong Liu; Feng Li

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In this paper, an interesting and new bifurcation phenomenon that limit cycles could be bifurcated from nilpotent node (focus) by changing its stability was investigated. It is different from lowing its multiplicity in order to get limit cycles. We prove that $n^2+n-1$ limit cycles could be bifurcated by this way for $2n+1$ degree system. Moreover, this upper bound could be reached. At last, we give two examples to show that $N(3)=1$ and $N(5)=5$.

Topics: Dynamical Systems, Mathematics

Source: http://arxiv.org/abs/1601.02826

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Sep 23, 2013
09/13

by
Feng Li; Mattias Villani

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Methods for choosing a fixed set of knot locations in additive spline models are fairly well established in the statistical literature. While most of these methods are in principle directly extendable to non-additive surface models, they are less likely to be successful in that setting because of the curse of dimensionality, especially when there are more than a couple of covariates. We propose a regression model for a multivariate Gaussian response that combines both additive splines and...

Source: http://arxiv.org/abs/1110.3689v2

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Sep 18, 2013
09/13

by
Feng Li; Shuigeng Zhou

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Most existing anonymization work has been done on static datasets, which have no update and need only one-time publication. Recent studies consider anonymizing dynamic datasets with external updates: the datasets are updated with record insertions and/or deletions. This paper addresses a new problem: anonymous re-publication of datasets with internal updates, where the attribute values of each record are dynamically updated. This is an important and challenging problem for attribute values of...

Source: http://arxiv.org/abs/0806.4703v2

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Sep 23, 2013
09/13

by
Feng-Li Yan; Dong Ding

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Two avowable quantum communication schemes are proposed. One is an avowable teleportation protocol based on the quantum cryptography. In this protocol one teleports a set of one-particle states based on the availability of an honest arbitrator, the keys and the Einstein-Podolsky-Rosen pairs shared by the communication parties and the arbitrator. The key point is that the fact of the teleportation can neither be disavowed by the sender nor be denied by the receiver. Another is an avowable...

Source: http://arxiv.org/abs/0801.4053v1

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Sep 18, 2013
09/13

by
Bin Chen; Feng-Li Lin

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In this paper we construct the 2+1 effective theory of the light states in D2/D4-brane system in the context of noncommutative Yang-Mills theory. This effective theory is noncommutative and tachyonic, however, it is not taking the form of an Abelian Higgs model as naively expected. We solve the classical solutions of the effective theory which are nicely corresponding to different states during the tachyon condensation process of the dissolution of D2-brane into D4-brane. We also find that if...

Source: http://arxiv.org/abs/hep-th/0105154v4

3
3.0

Jun 29, 2018
06/18

by
Feng Li; Che Ming Ko

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Using the Polyakov-Nambu-Jona-Lasinia (PNJL) model, we study the spinodal instability of a baryon-rich quark-gluon plasma in the linear response theory. We find that the spinodal unstable region in the temperature and density plane shrinks with increasing wave number of the unstable mode and is also reduced if the effect of Polyakov loop is not included. In the small wave number or long wavelength limit, the spinodal boundaries in both cases of with and without the Polyakov loop coincide with...

Topic: Nuclear Theory

Source: http://arxiv.org/abs/1601.00026

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Oct 28, 2014
10/14

by
Zhao, Liang; Feng, Li-ping

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This article is from Acta Crystallographica Section E: Structure Reports Online , volume 67 . Abstract In the title compound, C2H10N22+·2C6H4NO2−, the cation lies on an inversion centre. The asymmetric unit is composed of one nicotinate anion and one half ethylenediaminium cation. All the amino H atoms are involved in N—H⋯O and N—H⋯N hydrogen bonds. These hydrogen bonds link the ionic units into a three-dimensional network. In addition, π–π interactions between pyridine rings...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3152055

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Sep 23, 2013
09/13

by
Feng-Li Lin; Chopin Soo

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Boundary conditions and the corresponding states of a quantum field theory depend on how the horizons are taken into account. There is ambiguity as to which method is appropriate because different ways of incorporating the horizons lead to different results. We propose that a natural way of including the horizons is to first consider the Kruskal extension and then define the quantum field theory on the Euclidean section. Boundary conditions emerge naturally as consistency conditions of the...

Source: http://arxiv.org/abs/gr-qc/9708049v2

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9.0

Jun 28, 2018
06/18

by
Xing Huang; Feng-Li Lin

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We revisit the applications of integral geometry in AdS$_3$ and argue that the metric of the kinematic space can be realized as the entanglement contour, which is defined as the additive entanglement density. From the renormalization of the entanglement contour, we can holographically understand the operations of disentangler and isometry in multi-scale entanglement renormalization ansatz. Furthermore, a renormalization group equation of the long-distance entanglement contour is then derived....

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

Source: http://arxiv.org/abs/1507.04633

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Sep 22, 2013
09/13

by
Bin Chen; Feng-Li Lin

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Recently quintessence is proposed to explain the observation data of supernova indicating a time-varying cosmological constant and accelerating universe. Inspired by this and its mysterious origin, we look for the possibility of quintessence as the holographic dark matters dominated in the late time in the brane world scenarios. We consider both the cases of static and moving brane in a dilaton gravity background. For the static brane we use the Hamilton-Jacobi method motivated by holographic...

Source: http://arxiv.org/abs/hep-th/0106054v3

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Sep 22, 2013
09/13

by
Miao Li; Feng-Li Lin

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We propose a new holographic C-function for the accelerating universe defined in the stringy frame motivated mainly by the fact that the number of degrees of freedom should be infinite for a physical system of infinite size. This is the generalization of Strominger's recent proposal of the holographic C-function to the asymptotically non-de Sitter universe. We find that the corresponding C-theorem holds true if the universe accelerates toward the weak coupling regime driven by the exponential...

Source: http://arxiv.org/abs/hep-th/0111201v3

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58

Sep 22, 2013
09/13

by
Feng-Li Yan; Ting Gao

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We present a scheme for quantum communication, where a set of EPR pairs, initially shared by the sender Alice and the receiver Bob, functions as a quantum channel. After insuring the safety of the quantum channel, Alice applies local measurement on her particles of the EPR pairs and informs Bob the encoding classical information publicly. According to Alice's classical information and his measurement outcomes on the EPR pairs Bob can infer the secret messages directly. In this scheme, to...

Source: http://arxiv.org/abs/quant-ph/0501055v1

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41

Sep 20, 2013
09/13

by
Bin Chen; Feng-Li Lin

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In this paper we map the D-brane projector states in the vacuum string field theory to the noncommutative GMS solitons based on the recently proposed map of Witten's star to Moyal's star. We find that the singular geometry conditions of Moore and Taylor are associated with the commutative modes of these projector states in our framework. The properties of the candidate closed string state and the wedge state are also discussed, and the possibility of the non-GMS soliton in VSFT is commented.

Source: http://arxiv.org/abs/hep-th/0204233v4

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27

Sep 19, 2013
09/13

by
Shoichi Kawamoto; Feng-Li Lin

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We consider the holographic anyons in the ABJM theory from three different aspects of AdS/CFT correspondence. First, we identify the holographic anyons by using the field equations of supergravity, including the Chern-Simons terms of the probe branes. We find that the composite of Dp-branes wrapped over CP3 with the worldvolume magnetic fields can be the anyons. Next, we discuss the possible candidates of the dual anyonic operators on the CFT side, and find the agreement of their anyonic phases...

Source: http://arxiv.org/abs/0910.5536v3

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54

Sep 18, 2013
09/13

by
Feng-Li Lin; Dan Tomino

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We calculate the 1-loop effect in super-Yang-Mills which preserves 1/4-supersymmetries and is holographically dual to the null-like cosmology with a big-bang singularity. Though the bosonic and fermionic spectra do not agree precisely, we do obtain vanishing 1-loop vacuum energy for generic warped plane-wave type backgrounds with a big-bang singularity. Moreover, we find that the cosmological "constant" contributed either by bosons or fermions is time-dependent. The issues about the...

Source: http://arxiv.org/abs/hep-th/0611139v5

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Sep 18, 2013
09/13

by
Feng-Li Yan; Ting Gao

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We propose a quantum secret sharing protocol between multi-party ($m$ members in group 1) and multi-party ($n$ members in group 2) using a sequence of single photons. These single photons are used directly to encode classical information in a quantum secret sharing process. In this protocol, all members in group 1 directly encode their respective keys on the states of single photons via unitary operations, then the last one (the $m^{th}$ member of group 1) sends $1/n$ of the resulting qubits to...

Source: http://arxiv.org/abs/quant-ph/0502045v3

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11

Jun 28, 2018
06/18

by
Yu-Feng Li; Shu Luo

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In the presence of both direct and indirect unitarity violation in the lepton mixing matrix, we derive a complete set of series expansion formulas for neutrino oscillation probabilities in matter of constant density. Expansions in the mass hierarchy parameter $\alpha \equiv \Delta m_{21}^{2} / \Delta m_{31}^{2}$ and those unitarity violation parameters $s^{2}_{ij}$ (for i = 1, 2, 3 and j = 4, 5, 6) up to the first order are studied in this paper. We analyse the accuracy of the analytical series...

Topics: High Energy Physics - Phenomenology, High Energy Physics - Experiment

Source: http://arxiv.org/abs/1508.00052

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42

Sep 18, 2013
09/13

by
Feng-Li Lin; Toshihiro Matsuo

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We calculate the jet quenching parameter in medium with chemical potential from AdS/CFT correspondence. Our result is summarized in a plot. Moreover, we extract the explicit form of the jet quenching parameter of medium with small chemical potential for phases of dual SYM corresponding to large and small black holes. For the former phase, the jet quenching is increased as the charge density increases, however, for the latter it is the opposite though the background is thermodynamically unstable.

Source: http://arxiv.org/abs/hep-th/0606136v3

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34

Sep 21, 2013
09/13

by
Bin Chen; Feng-Li Lin

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In this paper we calculate the spectrum of Neumann matrix with zero modes in the presence of the constant B field in Witten's cubic string field theory. We find both the continuous spectrum inside $[{-1\over3}, 0)$ and the constraint on the existence of the discrete spectrum. For generic $\theta$, -1/3 is not in the discrete spectrum but in the continuous spectrum. For each eigenvalue in the continuous spectrum there are four twist-definite degenerate eigenvector except for -1/3 at which the...

Source: http://arxiv.org/abs/hep-th/0203204v3

3
3.0

Jun 29, 2018
06/18

by
Feng-Li Lin; Bo Ning

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We evaluate the relative entropy on a ball region near the UV fixed point of a holographic conformal field theory deformed by a fermionic operator of nonzero vacuum expectation value. The positivity of the relative entropy considered here is implied by the expected monotonicity of decrease of quantum entanglement under RG flow. The calculations are done in the perturbative framework of Einstein-Cartan gravity in four-dimensional asymptotic anti-de Sitter space with a postulated standard...

Topics: High Energy Physics - Theory, Quantum Physics, General Relativity and Quantum Cosmology

Source: http://arxiv.org/abs/1607.00263

In recent years, China’s economy has developed rapidly and the people’s living standards have continued to improve. A high end means of transportation, airplanes, is favored and accepted by more and more people with its advantages of comfort, speed, and safety. Accompanying it is the increase in pressure on passenger transportation in the aviation industry. The development of Chinas civil aviation industry is relatively late and relatively immature. It has only ushered in a development...

Topics: Airport, Passenger throughput, Prediction method

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33

Sep 18, 2013
09/13

by
Feng-Li Lin; Yong-Shi Wu

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In this paper we study non-commutative Yang-Mills theory (NCYM) through its gravity dual. First it is shown that the gravity dual of an NCYM with self-dual $\theta$-parameters has a Lagrangian in the form of five-dimensional dilatonic gravity. Then we use the de-Boer-Verlinde-Verlinde formalism for holographic renormalization group flows to calculate the coefficient functions in the Weyl anomaly of the NCYM at low energies under the assumption of potential dominance, and show that the...

Source: http://arxiv.org/abs/hep-th/0005054v2

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35

Sep 21, 2013
09/13

by
Feng-Li Lin; Wen-Yu Wen

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We construct a new class of 1/4-BPS time dependent domain-wall solutions with null-like metric and dilaton in type II supergravities, which admit a null-like big bang singularity. Based on the domain-wall/QFT correspondence, these solutions are dual to 1/4-supersymmetric quantum field theories living on a boundary cosmological background with time dependent coupling constant and UV cutoff. In particular we evaluate the holographic $c$ function for the 2-dimensional dual field theory living on...

Source: http://arxiv.org/abs/hep-th/0602124v2

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86

Jul 19, 2013
07/13

by
Yu-Feng Li; Zhi-Hua Zhou

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Semi-supervised support vector machines (S3VMs) are a kind of popular approaches which try to improve learning performance by exploiting unlabeled data. Though S3VMs have been found helpful in many situations, they may degenerate performance and the resultant generalization ability may be even worse than using the labeled data only. In this paper, we try to reduce the chance of performance degeneration of S3VMs. Our basic idea is that, rather than exploiting all unlabeled data, the unlabeled...

Source: http://arxiv.org/abs/1005.1545v2

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37

Sep 22, 2013
09/13

by
Feng-Li Lin; Shang-Yu Wu

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We study the thermodynamical phase structures of holographic QCD with nontrivial topologically charged domain-wall/membranes which are originally related to the multiple $\theta$-vacua in the large $N_c$ limit. We realize the topologically charged membranes as the holographic D6-brane fluxes in the Sakai-Sugimoto model. The D6-brane fluxes couple to the probe D8-anti-D8 via Chern-Simon term, and act as the source for the baryonic current density of QCD. We find rich phase structures of the dual...

Source: http://arxiv.org/abs/0805.2933v3

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55

Sep 21, 2013
09/13

by
Zhang Guo-Hua; Yan Feng-Li

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We present a scheme of probabilistic dense coding via a quantum channel of non-maximally entangled three-particle state. The quantum dense coding will be succeeded with a certain probability if the sender introduces an auxiliary particle and performs a collective unitary transformation. Furthermore, the average information transmitted in this scheme is calculated.

Source: http://arxiv.org/abs/0902.3711v1

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Sep 23, 2013
09/13

by
Feng-Li Lin; Shang-Yu Wu

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We provide a framework for non-relativistic holography so that a covariant action principle ensuring the Galilean symmetry for dual conformal field theory is given. This framework is based on the Bargmann lift of the Newton-Cartan gravity to the one-dimensional higher Einstein gravity, or reversely, the null-like Kaluza-Klein reduction. We reproduce the previous zero temperature results, and our framework provides a natural explanation about why the holography is co-dimension 2. We then...

Source: http://arxiv.org/abs/0810.0227v4

2
2.0

Jun 30, 2018
06/18

by
Yu-Feng Li; Ye-Ling Zhou

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We discuss reactor antineutrino oscillations with non-standard interactions (NSIs) at the neutrino production and detection processes. The neutrino oscillation probability is calculated with a parametrization of the NSI parameters by splitting them into the averages and differences of the production and detection processes respectively. The average parts induce constant shifts of the neutrino mixing angles from their true values, and the difference parts can generate the energy (and baseline)...

Topics: High Energy Physics - Phenomenology, High Energy Physics - Experiment

Source: http://arxiv.org/abs/1408.6301

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34

Sep 20, 2013
09/13

by
Jin-Shi Xu; Chuan-Feng Li

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Open quantum systems have attracted great attention, since inevitable coupling between quantum systems and their environment greatly affects the features of interest of these systems. Quantum discord, is a measure of the total nonclassical correlation in a quantum system that includes, but is not exclusive to, the distinct property of quantum entanglement. Quantum discord can exist in separated quantum states and plays an important role in many fundamental physics problems and practical quantum...

Source: http://arxiv.org/abs/1205.0871v2

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41

Sep 18, 2013
09/13

by
Feng-Li Yan; Hai-Rui Huo

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We suggest a method for teleporting an unknown quantum state. In this method the sender Alice first uses a Controlled-Not operation on the particle in the unknown quantum state and an ancillary particle which she wants to send to the receiver Bob. Then she sends ancillary particle to Bob. When Alice is informed by Bob that the ancillary particle is received, she performs a local measurement on the particle and sends Bob the outcome of the local measurement via a classical channel. Depending on...

Source: http://arxiv.org/abs/quant-ph/0504213v1

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29

Sep 23, 2013
09/13

by
Yan Feng-Li; Zhang Guo-Hua

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We present a scheme of remote preparation of the two-particle state by using two Einstein-Podolsky-Rosen pairs or two partial entangled two-particle states as the quantum channel. The probability of the successful remote state preparation is obtained.

Source: http://arxiv.org/abs/0903.1429v1

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37

Sep 21, 2013
09/13

by
I-Ching Yu; Feng-Li Lin

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Information causality was proposed as a physical principle to put upper bound on the accessible information gain in a physical bi-partite communication scheme. Intuitively, the information gain cannot be larger than the amount of classical communication to avoid violation of causality. Moreover, it was shown that this bound is consistent with the Tsirelson bound for the binary quantum systems. In this paper, we test the information causality for the more general (non-binary) quantum...

Source: http://arxiv.org/abs/1301.1448v3

2
2.0

Jun 29, 2018
06/18

by
Yun-Feng Li; Xian-Qiao Yu

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We recalculate the branching ratio and CP asymmetry for $\bar{B}^{0} (B^{0})\to \pi^{0}\pi^{0}$ decays in the Perturbative QCD approach. In this approach, we consider all the possible diagrams including non-factorizable contributions and annihilation contributions. We obtain $Br(\bar{B}^{0} (B^{0})\to \pi^{0}\pi^{0})=(1.17_{-0.12}^{+0.11})\times 10^{-6}$. Our result is in agreement with the latest measured branching ratio of $B^{0}\to\pi^{0}\pi^{0}$ by the Belle and HFAG Collaborations. We also...

Topic: High Energy Physics - Phenomenology

Source: http://arxiv.org/abs/1601.03632

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Sep 18, 2013
09/13

by
Mei-Yu Wang; Feng-Li Yan

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In this paper, we have considered the problem of general conclusive quantum state classification; the necessary and sufficient conditions for the existence of conclusive classification strategies have also been presented. Moreover, we have given the upper bound for the maximal success probability.

Source: http://arxiv.org/abs/quant-ph/0605127v1

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Sep 18, 2013
09/13

by
Mei-Yu Wang; Feng-Li Yan

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We investigate the lower bound of the amount of entanglement for faithfully teleporting a quantum state belonging to a subset of the whole Hilbert space. Moreover, when the quantum state belongs to a set composed of two states, a probabilistic teleportation scheme is presented using a non-maximally entangled state as the quantum channel. We also calculate the average transmission efficiency of this scheme.

Source: http://arxiv.org/abs/quant-ph/0509217v1

2
2.0

Jun 30, 2018
06/18

by
Yu-Feng Li; Zhen-hua Zhao

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Tests of Lorentz and CPT violation in the medium baseline reactor antineutrino experiment are presented in the framework of the Standard Model Extension (SME). Both the spectral distortion and sidereal variation are employed to derive the limits of Lorentz violation (LV) coefficients. We do the numerical analysis of the sensitivity of LV coefficients by taking the Jiangmen Underground Neutrino Observatory (JUNO) as an illustration, which can improve the sensitivity by more than two orders of...

Topic: High Energy Physics - Phenomenology

Source: http://arxiv.org/abs/1409.6970

2
2.0

Jun 29, 2018
06/18

by
Pei-Hua Liu; Feng-Li Lin

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In this paper, we consider the decoherence patterns of a topological qubit made of two Majorana zero modes in the generic linear and circular motions in the Minkowski spacetime. We show that the reduced dynamics is exact without Markov approximation. Our results imply that the acceleration will cause thermalization as expected by Unruh effect. However, for the short-time scale, we find the rate of decoherence is anti-correlated with the acceleration, as kind of decoherence impedance. This is in...

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

Source: http://arxiv.org/abs/1603.05136

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36

Sep 19, 2013
09/13

by
Mei-Yu Wang; Feng-Li Yan

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We present a scheme for three-party simultaneous quantum secure direct communication by using EPR pairs. In the scheme, three legitimate parties can simultaneously exchange their secret messages. It is also proved to be secure against the intercept-and-resend attack, the disturbance attack and the entangled-and-measure attack.

Source: http://arxiv.org/abs/quant-ph/0701046v1

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48

Sep 20, 2013
09/13

by
Lian Shi-Man; Yan Feng-Li

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We propose a scheme for probabilistic teleportation of an unknown two-particle state of general formation in ion trap. It is shown that one can realize experimentally this teleportation protocol of two-particle state with presently available techniques.

Source: http://arxiv.org/abs/1002.1977v1

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Sep 20, 2013
09/13

by
Li Shu-Yue; Yan Feng-Li

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Based on resonant sideband excitation, we present a scheme for the generation of six-qubit cluster state in ion-trap system. One can realize experimentally this scheme with presently available techniques.

Source: http://arxiv.org/abs/1002.1981v1

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Sep 22, 2013
09/13

by
Valeri P. Frolov; Feng-Li Lin

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We study solutions of the supergravity equations with the string-like sources moving with the speed of light. An exact solution is obtained for the gravitational field of a boosted ring string in any dimension greater than three.

Source: http://arxiv.org/abs/hep-th/0603018v2

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Sep 20, 2013
09/13

by
Shih-Hao Ho; Feng-Li Lin

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In the context of AdS/CFT correspondence, we propose how to define the (symmetry-protected) topological orders for the holographic conformal field theories (CFTs) via the non-normalizable modes of the anti-de Sitter (AdS) bulk fields. To be specific, we consider the sector of the CFTs which is dual to the multi-flavor massive free fermions in AdS space. We demonstrate that the classification of the topological edge modes on the AdS boundary can be done by classifying the symmetry-protected...

Source: http://arxiv.org/abs/1205.4185v3

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Sep 21, 2013
09/13

by
Yong-Feng Li; Bang-Gui Liu

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We investigate the structural, electronic, and magnetic properties of stoichiometric LiFeAs by using state-of-the-arts first-principles method. We find the magnetic ground-state by comparing the total energies among all the possible magnetic orders. Our calculated internal positions of Li and As are in good agreement with experiment. Our results show that stoichiometric LiFeAs has almost the same striped antiferromagnetic spin order as other FeAs-based parent compounds and tetragonal FeSe do,...

Source: http://arxiv.org/abs/0905.3303v2

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Sep 21, 2013
09/13

by
Ching-Yu Huang; Feng-Li Lin

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We study the connection between topological order and degeneracy of the singular value spectrum by explicitly solving the two-dimensional dimerized quantum Heisenberg model in the form of tensor product state ansatz. Based on the ground state solution, we find non-zero topological entanglement entropy at the frustrated regime. It indicates a possible topological phase. Furthermore, we find that the singular value spectrum associated with each link in tensor product state is doubly degenerate...

Source: http://arxiv.org/abs/1104.1139v3