Results for "Jian-Pin Wu"

total 16678took 0.10s
Holographic fermions in charged Gauss-Bonnet black holeMar 21 2011Aug 01 2011We study the properties of the Green's functions of the fermions in charged Gauss-Bonnet black hole. What we want to do is to investigate how the presence of Gauss-Bonnet coupling constant $\alpha$ affects the dispersion relation, which is a characteristic ... More
Momentum dissipation and holographic transport without self-dualitySep 15 2016Oct 13 2016We implement the momentum dissipation introduced by spatial linear axionic fields in a holographic model without self-duality, broke by Weyl tensor coupling to Maxwell field, and study its response. It is found that for the positive Weyl coupling parameter ... More
Some properties of the holographic fermions in an extremal charged dilatonic black holeAug 31 2011We study the properties of the Green's functions of the fermions in the extremal charged dilatonic black hole proposed by Gubser and Rocha [Phys. Rev. D \textbf{81}, 046001 (2010)]. We find that many properties seem to be in agreement with that of Fermi ... More
The Stückelberg Holographic Superconductors in Constant External Magnetic FieldJun 02 2010Jul 08 2010We investigate the St\"{u}ckelberg holographic superconductor in present of the constant external magnetic field. We observe that a critical value of magnetic field exists as the cases in usual holographic superconductor. Furthermore, we find that the ... More
Transport phenomena and Weyl correction in effective holographic theory of momentum dissipationFeb 08 2019We construct a higher derivative theory involving an axionic field and the Weyl tensor in four dimensional spacetime. Up to the first order of the coupling parameters, the charged black brane solution with momentum dissipation in a perturbative manner ... More
The cosmological perturbation theory in loop cosmology with holonomy correctionsJan 08 2010May 21 2010In this paper we investigate the scalar mode of first-order metric perturbations over spatially flat FRW spacetime when the holonomy correction is taken into account in the semi-classical framework of loop quantum cosmology. By means of the Hamiltonian ... More
Thermal non-Gaussianity in holographic cosmologySep 19 2008Nov 03 2008Recently it has been shown that the thermal holographic fluctuations can give rise to an almost scale invariant spectrum of metric perturbations since in this scenario the energy is proportional to the area of the boundary rather than the volume. Here ... More
A note on entropic force and brane cosmologyJan 29 2010Feb 05 2010Recently Verlinde proposed that gravity is an entropic force caused by information changes when a material body moves away from the holographic screen. In this note we apply this argument to brane cosmology, and show that the cosmological equation can ... More
Anomaly freedom of the vector modes with holonomy corrections in perturbative Euclidean loop quantum gravitySep 13 2012Feb 10 2013We study the perturbation of the effective Hamiltonian constraint with holonomy correction from Euclidean loop quantum gravity. The Poisson bracket between the corrected Hamiltonian constraint and the diffeomorphism constraint is derived for vector modes. ... More
Thermal non-Gaussianity in Near-Milne universeAug 17 2009Jan 31 2010The thermal non-Gaussianity in Near-Milne universe is investigated in this letter. Through classifying thermal fluctuations into two types, one characterized by a phase transition and the other without phase transition, we show that for fluctuations undergoing ... More
Dynamics of tachyon field in spatially curved FRW universeMar 09 2010Mar 16 2010The dynamics of a tachyon field plus a barotropic fluid is investigated in spatially curved FRW universe. We perform a phase-plane analysis and obtain scaling solutions accompanying with a discussion on their stability. Furthermore, we construct the form ... More
Holographic superconductors from the massive gravityApr 21 2014Sep 24 2014A holographic superconductor is constructed in the background of a massive gravity theory. In the normal state without condensation, the conductivity exhibits a Drude peak that approaches a delta function in the massless gravity limit as studied by David ... More
Scalar Boundary Conditions in Hyperscaling Violating GeometryDec 11 2015We study the possible boundary conditions of scalar field modes in a hyperscaling violation(HV) geometry with Lifshitz dynamical exponent $z (z\geqslant1)$ and hyperscaling violation exponent $\theta (\theta\neq0)$. For the case with $\theta>0$, we show ... More
DC and Hall conductivity in holographic massive Einstein-Maxwell-Dilaton gravityApr 02 2015Aug 18 2015We investigate the holographic DC and Hall conductivity in massive Einstein-Maxwell-Dilaton (EMD) gravity. Two special EMD backgrounds are considered explicitly. One is dyonic Reissner-Nordstr$\ddot{o}$m-AdS (RN-AdS) geometry and the other one is hyperscaling ... More
Characterization of Quantum Phase Transition using Holographic Entanglement EntropyApr 17 2016Jun 19 2016The entanglement exhibits extremal or singular behavior near quantum critical points (QCPs) in many condensed matter models. These intriguing phenomena, however, still call for a widely accepted understanding. In this letter we study this issue in holographic ... More
Holographic fermions in charged dilaton black branesMar 03 2012Feb 10 2013By imposing the relativistic boundary term and Lorentz violating that in the dilatonic black brane with a Lifshitz like IR geometry and $AdS_4$ boundary, we study the properties of the spectral functions of the fermions. We find that in the two fixed ... More
Transport coefficients from hyperscaling violating black brane: shear viscosity and conductivityNov 10 2015Nov 16 2015We investigate two transport coefficients, shear viscosity and conductivity, in a non-relativistic boundary filed theory without hyperscaling symmetry, which is dual to a bulk charged hyperscaling violating black brane. Employing matching method, we obtain ... More
Holographic Butterfly Effect at Quantum Critical PointsOct 09 2016When the Lyapunov exponent $\lambda_L$ in a quantum chaotic system saturates the bound $\lambda_L\leqslant 2\pi k_BT$, it is proposed that this system has a holographic dual described by a gravity theory. In particular, the butterfly effect as a prominent ... More
Holographic incoherent transport in Einstein-Maxwell-dilaton GravityDec 04 2015Dec 01 2016Recent progress in the holographic approach makes it more transparent that each conductivity can be decomposed into the coherent contribution due to momentum relaxation and the incoherent contribution due to intrinsic current relaxation. In this paper ... More
Note on the butterfly effect in holographic superconductor modelsOct 23 2016In this note we remark that the butterfly effect can be used to diagnose the phase transition of superconductivity in a holographic framework. Specifically, we compute the butterfly velocity in a charged black hole background as well as anisotropic backgrounds ... More
A Novel Insulator by Holographic Q-latticesOct 19 2015Feb 19 2016We construct a bulk geometry with Q-lattice structure, which is implemented by two gauge fields and a coupling between the lattice and the Maxwell field. This gravity dual model can describe a novel insulator which exhibits some key features analogous ... More
Dynamic gap from holographic fermions in charged dilaton black branesJan 12 2012May 01 2012We report a dynamical formation of a (Mott) gap from holographic fermions. By coupling a fermion field with dipole action to the charged dilaton black branes with a Lifshitz like IR geometry and $AdS_{4}$ boundary, we find that when the dipole interaction ... More
Holographic superconductor on a novel insulatorNov 21 2017Jan 09 2018We construct a holographic superconductor model, based on a gravity theory, which exhibits novel metal-insulator transitions. We investigate the condition for the condensation of the scalar field over the parameter space, and then focus on the superconductivity ... More
Building a doped Mott system by holographyJul 09 2015Oct 23 2015We construct a holographic model in the framework of Q-lattices whose dual exhibits metal-insulator transitions. By introducing an interacting term between the Q-lattice and the electromagnetic field in bulk geometry, we find such kind of transition can ... More
Dynamically generated gap from holography in the charged black brane with hyperscaling violationNov 20 2014May 04 2015We holographically investigate the effects of a dipole coupling between a fermion field and a $U(1)$ gauge field on the dual fermionic sector in the charged gravity bulk with hyperscaling violation. We analytically study the features of the ultraviolet ... More
Holographic Metal-Insulator Transition in Higher Derivative GravityJun 25 2016Jul 04 2016We introduce a Weyl term into the Einstein-Maxwell-Axion theory in four dimensional spacetime. Up to the first order of the Weyl coupling parameter $\gamma$, we construct charged black brane solutions without translational invariance in a perturbative ... More
Formation of Fermi surfaces and the appearance of liquid phases in holographic theories with hyperscaling violationSep 10 2014Nov 03 2014We consider a holographic fermionic system in which the fermions are interacting with a U(1) gauge field in the presence of a dilaton field in a gravity bulk of a charged black hole with hyperscaling violation. Using both analytical and numerical methods, ... More
Holographic Lattice in Einstein-Maxwell-Dilaton GravitySep 18 2013Sep 25 2013We construct an ionic lattice background in the framework of Einstein-Maxwell-dilaton theory in four dimensional space time. The optical conductivity of the dual field theory on the boundary is investigated. Due to the lattice effects, we find the imaginary ... More
Dynamical gap from holography in the charged dilaton black holeOct 21 2012May 29 2013We study the holographic non-relativistic fermions in the presence of bulk dipole coupling in charged dilatonic black hole background. We explore the nontrivial effects of the bulk dipole coupling, the fermion charge as well as the dilaton field on the ... More
Bouncing universe from a modified dispersion relationSep 28 2009Nov 19 2009In this paper we argue that modified Friedmann equations with a bounce solution can be derived from a modified dispersion relation by employing a thermodynamical description of general relativity on the apparent horizon.
The pseudo-gap phase and the duality in holographic fermionic system with dipole coupling on Q-latticeFeb 19 2016We classify the different phases by the "pole-zero mechanism" for a holographic fermionic system which contains a dipole coupling with strength $p$ on a Q-lattice background. A complete phase structure in $p$ space can be depicted in terms of Fermi liquid, ... More
Dipole Coupling Effect of Holographic Fermion in the Background of Charged Gauss-Bonnet AdS Black HoleMay 30 2012Jul 10 2012We investigate the holographic fermions in the charged Gauss-Bonnet $AdS_{d}$ black hole background with the dipole coupling between fermion and gauge field in the bulk. We show that in addition to the strength of the dipole coupling, the spacetime dimension ... More
Entanglement of Purification in Holographic SystemsFeb 06 2019The holographic entanglement of purification (EoP) in AdS$_{4}$ and AdS-RN black hole backgrounds is studied. We develop an algorithm to compute the EoP for bipartite configuration with infinitely long strips. The temperature behavior of EoP is revealed ... More
Chaos from the ring string in Gauss-Bonnet black hole in $AdS_5$ spaceMay 14 2014By the Poincare sections, the dynamical behaviors of the ring string in the AdS-Gauss-Bonnet (AdS-GB) black hole are studied. A threshold value of the Gauss-Bonnet (GB) parameter $\lambda$ are found by the numerical method, below which the behavior of ... More
Quintessence reconstruction of the new agegraphic dark energy modelMay 04 2008May 08 2008In this paper we implement the new agegraphic dark energy model with quintessence field. We demonstrate that the new agegraphic evolution of the universe can be described completely by a single quintessence field. Its potential as a function of the quintessence ... More
The Stückelberg Holographic Superconductors with Weyl correctionsJan 12 2012In this letter we construct the St\"{u}ckelberg holographic superconductor with Weyl corrections. Under such corrections, the Weyl coupling parameter $\gamma$ plays an important role in the order of phase transitions and the critical exponents of second ... More
Holographic Superconductor on Q-latticeOct 24 2014Feb 15 2015We construct the simplest gravitational dual model of a superconductor on Q-lattices. We analyze the condition for the existence of a critical temperature at which the charged scalar field will condense. In contrast to the holographic superconductor on ... More
The 3+1 holographic superconductor with Weyl correctionsOct 10 2010Feb 16 2011In this paper we study $3+1$ holographic superconductors with Weyl corrections. We find that the critical temperature of a superconductor with Weyl corrections increases as we amplify the Weyl coupling parameter $\gamma$, indicating the condensation will ... More
Holographic fermionic system with dipole coupling on Q-latticeOct 27 2014Dec 28 2014We construct a holographic model for a fermionic system on Q-lattice and compute the spectral function in the presence of a dipole coupling. Both key features of doped Mott insulators, the dynamical generation of a gap and spectral weight transfer, are ... More
Anisotropic Fermi surface from holographySep 22 2014Jun 13 2015We investigate the probe holographic fermions by using an anisotropic charged black brane solution. We derive the equation of motion of probe bulk fermions with one Fermi momentum along the anisotropic and one along the isotropic directions. We then numerically ... More
Thermal fluctuations in viscous cosmologyJan 28 2010Mar 28 2010In this paper we investigate the power spectrum of thermal fluctuations in very early stage of viscous cosmology. When the state parameter as well as the viscous coefficient of a barotropic fluid is properly chosen, a scale invariant spectrum with large ... More
Fermionic phase transition induced by the effective impurity in holographyJul 11 2015Nov 22 2015We investigate the holographic fermionic phase transition induced by the effective impurity in holography, which is introduced by massless scalar fields in Einstein-Maxwell-massless scalar gravity. We obtain a phase diagram in $(\alpha, T)$ plane separating ... More
Holographic Entanglement Entropy Close to Quantum Phase TransitionsFeb 12 2015Apr 25 2016We investigate the holographic entanglement entropy (HEE) of a strip geometry in four dimensional Q-lattice backgrounds, which exhibit metal-insulator transitions in the dual field theory. Remarkably, we find that the HEE always displays a peak in the ... More
A network centrality method for the rating problemMar 05 2014We propose a new method for aggregating the information of multiple reviewers rating multiple products. Our approach is based on the network relations induced between products by the rating activity of the reviewers. We show that our method is algorithmically ... More
On Some Applications of Group Representation Theory to Algebraic Problems Related to the Congruence Principle for Equivariant MapsJun 08 2017Given a finite group $G$ and two unitary $G$-representations $V$ and $W$, possible restrictions on Brouwer degrees of equivariant maps between representation spheres $S(V)$ and $S(W)$ are usually expressed in a form of congruences modulo the greatest ... More
On spurious regressions with trending variablesJun 16 2016This paper examines three types of spurious regressions where both the dependent and independent variables contain deterministic trends, stochastic trends, or breaking trends. We show that the problem of spurious regression disappears if the trend functions ... More
The effect of clusterings on the equilibrium states of local majority-rule: Occurrence probability and robustnessJan 02 2012The equilibrium states associated with the local majority-rule are divided into three classes, the states of system-wide coordination, the trapped states, and the states of period-2. The effect of clustering coefficient on the occurrence probability of ... More
Characterizing the process of reaching consensus for social systemsJun 28 2011A novel way of characterizing the process of reaching consensus for a social system is given. The foundation of the characterization is based on the theorem which states that the sufficient and necessary condition for a system to reach the state of consensus ... More
Multiple Periodic Solutions for $Γ$-symmetric Newtonian SystemsDec 23 2016The existence of periodic solutions in $\Gamma$-symmetric Newtonian systems $\ddot{x}=-\nabla f(x)$ can be effectively studied by means of the $(\Gamma\times O(2))$-equivariant gradient degree with values in the Euler ring $U(\Gamma\times O(2))$. In this ... More
Strongly Liftable Schemes and the Kawamata-Viehweg Vanishing in Positive Characteristic IIIJan 05 2013Aug 01 2013A smooth scheme X over a field k of positive characteristic is said to be strongly liftable over W_2(k), if X and all prime divisors on X can be lifted simultaneously over W_2(k). In this paper, we first deduce the Kummer covering trick over W_2(k), which ... More
The Parallel Knowledge Gradient Method for Batch Bayesian OptimizationJun 14 2016In many applications of black-box optimization, one can evaluate multiple points simultaneously, e.g. when evaluating the performances of several different neural network architectures in a parallel computing environment. In this paper, we develop a novel ... More
Calogero-Sutherland model in interacting fermion picture and explicit construction of Jack statesOct 31 2011Nov 04 2011The 40-year-old Calogero-Sutherland (CS) model remains a source of inspirations for understanding 1d interacting fermions. At $\beta=1, \text{or}0$, the CS model describes a free non-relativistic fermion, or boson theory, while for generic $\beta$, the ... More
Quiver Matrix Mechanics for IIB String Theory (II): Generic Dual Tori, Fractional Matrix Membrane and $SL(2,\integer)$ DualityFeb 25 2004May 19 2004With the deconstruction technique, the geometric information of a torus can be encoded in a sequence of orbifolds. By studying the Matrix Theory on these orbifolds as quiver mechanics, we present a formulation that (de)constructs the torus of {\em generic ... More
From Liouville to Chern-Simons, Alternative Realization of Wilson Loop Operators in AGT DualityNov 10 2009Dec 02 2009We propose an SL(2,R) Chern-Simons description of Liouville field theory (LFT), whose correlation function duals to partition function of N=2 SU(2) gauge theories. We give the dual expressions for conformal blocks, fusion rules, and Wilson loop operators ... More
The Parallel Knowledge Gradient Method for Batch Bayesian OptimizationJun 14 2016Oct 29 2016In many applications of black-box optimization, one can evaluate multiple points simultaneously, e.g. when evaluating the performances of several different neural network architectures in a parallel computing environment. In this paper, we develop a novel ... More
Spin Susceptibility and Helical Magnetic Orders at the Edges/Surfaces of Topological Insulators Due to Fermi Surface NestingDec 06 2010Apr 08 2011We study spin susceptibility and magnetic order at the edges/surfaces of two-dimensional and three-dimensional topological insulators when the Fermi surface is nested. We find that due to spin-momentum locking as well as time-reversal symmetry, spin susceptibility ... More
From topological strings to minimal modelsApr 08 2015Aug 06 2015We glue four refined topological vertices to obtain the building block of 5D $U(2)$ quiver instanton partition functions. We take the 4D limit of the result to obtain the building block of 4D instanton partition functions which, using the AGT correspondence, ... More
Range-Renewal Structure in Continued FractionsMay 09 2013Let $\omega=[a_1, a_2, \cdots]$ be the infinite expansion of continued fraction for an irrational number $\omega \in (0,1)$; let $R_n (\omega)$ (resp. $R_{n, \, k} (\omega)$, $R_{n, \, k+} (\omega)$) be the number of distinct partial quotients each of ... More
A conjecture on equitable vertex arboricity of graphsNov 21 2012Wu, Zhang and Li [4] conjectured that the set of vertices of any simple graph $G$ can be equitably partitioned into $\lceil(\Delta(G)+1)/2\rceil$ subsets so that each of them induces a forest of $G$. In this note, we prove this conjecture for graphs $G$ ... More
Non-Abelian toplogical superconductors from topological semimetals and related systems under superconducting proximity effectJul 21 2011Jan 11 2013Non-Abelian toplogical superconductors are characterized by the existence of {zero-energy} Majorana fermions bound in the quantized vortices. This is a consequence of the nontrivial bulk topology characterized by an {\em odd} Chern number. It is found ... More
Holographic incoherent transport in Einstein-Maxwell-Dilaton GravityDec 04 2015Dec 15 2015Recent progress in holographic approach makes it more transparent that each conductivity can be decomposed into the coherent contribution due to momentum relaxation and the incoherent contribution due to intrinsic current relaxation. In this paper we ... More
On the permanental nullity and matching number of graphsMar 10 2016For a graph $G$ with $n$ vertices, let $\nu(G)$ and $A(G)$ denote the matching number and adjacency matrix of $G$, respectively. The permanental polynomial of $G$ is defined as $\pi(G,x)={\rm per}(Ix-A(G))$. The permanental nullity of $G$, denoted by ... More
Network-Wide Distributed Carrier Frequency Offsets Estimation and CompensationJul 10 2016In this paper, we propose a fully distributed algorithm for frequency offsets estimation in decentralized systems. With the proposed algorithm, each node estimates its frequency offsets by local computations and limited exchange of information with its ... More
Distributed Clock Skew and Offset Estimation in Wireless Sensor Networks: Asynchronous Algorithm and Convergence AnalysisJul 10 2016In this paper, we propose a fully distributed algorithm for joint clock skew and offset estimation in wireless sensor networks based on belief propagation. In the proposed algorithm, each node can estimate its clock skew and offset in a completely distributed ... More
Vertex Operators, $\mathbb{C}^3$ Curve and Topological VertexMar 02 2014In this article, we prove the conjecture that Kodaira-Spencer theory for the topological vertex is a free fermion theory. By dividing the $\mathbb{C}^3$ curve into core and asymptotic regions and using Boson-Fermion correspondence, we construct a generic ... More
Fluctuations in Gene Regulatory Networks as Gaussian Colored NoiseOct 23 2009Dec 22 2009The study of fluctuations in gene regulatory networks is extended to the case of Gaussian colored noise. Firstly, the solution of the corresponding Langevin equation with colored noise is expressed in terms of an Ito integral. Then, two important lemmas ... More
Dynamical Instability of Holographic QCD at Finite DensityApr 01 2010Nov 19 2010In this paper we study the dynamical instability of Sakai-Sugimoto's holographic QCD model at finite baryon density. In this model, the baryon density, represented by the smeared instanton on the worldvolume of the probe D8-\overline{D8} mesonic brane, ... More
Discrete Attacks and Submodular Optimization with Applications to Text ClassificationDec 01 2018Adversarial examples are carefully constructed modifications to an input that completely change the output of a classifier but are imperceptible to humans. Despite these successful attacks for continuous data (such as image and audio samples), generating ... More
On Hawking's Local Rigidity Theorems for Charged Black HolesMar 27 2009We show the existence of a Hawking vector field in a full neighborhood of a local, regular, bifurcate, non-expanding horizon embedded in a smooth Einstein-Maxwell space-time without assuming the underlying space-time is analytic. It extends one result ... More
Lifting to cluster-tilting objects in higher cluster categoriesOct 19 2008Dec 29 2008In this note, we consider the $d$-cluster-tilted algebras, the endomorphism algebras of $d$-cluster-tilting objects in $d$-cluster categories. We show that a tilting module over such an algebra lifts to a $d$-cluster-tilting object in this $d$-cluster ... More
SafeZone: A Hierarchical Inter-Domain Authenticated Source Address Validation SolutionMar 19 2011Next generation Internet is highly concerned about the issue of reliability. Principally, the foundation of reliability is authentication of the source IP address. With the signature-and-verification based defense mechanisms available today, unfortunately, ... More
k-forested choosability of graphs with bounded maximum average degreeFeb 19 2011A proper vertex coloring of a simple graph is $k$-forested if the graph induced by the vertices of any two color classes is a forest with maximum degree less than $k$. A graph is $k$-forested $q$-choosable if for a given list of $q$ colors associated ... More
Equitable vertex arboricity of graphsNov 18 2012An equitable $(t,k,d)$-tree-coloring of a graph $G$ is a coloring to vertices of $G$ such that the sizes of any two color classes differ by at most one and the subgraph induced by each color class is a forest of maximum degree at most $k$ and diameter ... More
A universal exponential factor in the dimensional crossover from graphene to graphiteAug 01 2010Aug 30 2011A universal exponential factor, $\gamma_{c}=\pi/2$, is disclosed for the dimensional crossover of few-layer graphene (FLG) from two-dimensional graphene to three-dimensional graphite. $\gamma_{c}$ is found by analyzing available experimental data on different ... More
An unlikely resultJan 28 2005Oct 29 2005This paper has been withdrawn by the authors
Cost Minimization in Multiple IaaS Clouds: A Double Auction ApproachAug 04 2013Dec 08 2013IaaS clouds invest substantial capital in operating their data centers. Reducing the cost of resource provisioning, is their forever pursuing goal. Computing resource trading among multiple IaaS clouds provide a potential for IaaS clouds to utilize cheaper ... More
Edge covering pseudo-outerplanar graphs with forestsAug 19 2011Oct 19 2011A graph is called pseudo-outerplanar if each block has an embedding on the plane in such a way that the vertices lie on a fixed circle and the edges lie inside the disk of this circle with each of them crossing at most one another. In this paper, we prove ... More
Urban-rural gap and poverty traps in China: A prefecture level analysisOct 17 2016Urban-rural gap and regional inequality are long standing problems in China and result in considerable number of studies. This paper examines the dynamic behaviors of incomes for both urban and rural areas with a prefectural data set. The analysis is ... More
Decomposable stationary distribution of a multidimensional SRBMDec 04 2013Nov 29 2014We call a multidimensional distribution to be decomposable with respect to a partition of two sets of coordinates if the original distribution is the product of the marginal distributions associated with these two sets. We focus on the stationary distribution ... More
Structural properties of 1-planar graphs and an application to acyclic edge coloringAug 30 2010Dec 30 2010A graph is called 1-planar if it can be drawn on the plane so that each edge is crossed by at most one other edge. In this paper, we establish a local property of 1-planar graphs which describes the structure in the neighborhood of small vertices (i.e. ... More
Bright and dark modes induced by graphene bubblesSep 09 2011Through a lattice dynamics analysis, it is revealed that the bubble plays a role of energy shield in the graphene, which helps to split the normal modes into two categories of distinct topological nature, namely the bright and dark modes. The topological ... More
A theoretical study of thermal conductivity in single-walled boron nitride nanotubesFeb 28 2011Aug 30 2011We perform a theoretical investigation on the thermal conductivity of single-walled boron nitride nanotubes (SWBNT) using the kinetic theory. By fitting to the phonon spectrum of boron nitride sheet, we develop an efficient and stable Tersoff-derived ... More
Self-repairing in single-walled carbon nanotubes by heat treatmentJul 26 2010Structure transformation by heat treatment in single-walled carbon nanotubes (SWCNT) is investigated using molecular dynamics simulation. The critical temperature for the collapse of pure SWCNT is as high as 4655 K due to strong covalent carbon-carbon ... More
Thermal expansion in multiple layers of grapheneAug 30 2011In this file, we apply the nonequilibrium Green's function method to calculate the coefficient of thermal expansion (CTE) in multiple layers of graphene. We focus on the effect from different layer number $N$. Our main prediction is that: the increase ... More
Manipulation of heat current by the interface between graphene and white grapheneApr 18 2011Aug 30 2011We investigate the heat current flowing across the interface between graphene and hexagonal boron nitride (so-called white graphene) using both molecular dynamics simulation and nonequilibrium Green's function approaches. These two distinct methods discover ... More
Energy Estimates and Gravitational CollapseMay 13 2011We study the cancelations in the energy estimates for Einstein vacuum equations in order to prove the formation of black holes along evolutions. The novelty of the paper is that, we completely avoid using rotation vector fields to establish the global ... More
Dynamical formation of black holes due to the condensation of matter fieldMay 30 2011The purpose of the paper is to understand a mechanism of evolutionary formation of trapped surfaces when there is an electromagnetic field coupled to the background space-time. Based on the short pulse ansatz, on a given finite outgoing null hypersurface ... More
Phase space and quark mass effects in neutrino emissions in a color superconductorMay 09 2006Jun 30 2006We study the phase space for neutrino emissions with massive quarks in direct Urca processes in normal and color superconducting quark matter. We derive in QCD and the NJL model the Fermi momentum reduction resulting from Fermi liquid properties which ... More
Fitting the Continuum Component of A Composite SDSS Quasar Spectrum Using CMA-ESDec 27 2013Fitting the continuum component of a quasar spectrum in UV/optical band is challenging due to contamination of numerous emission lines. Traditional fitting algorithms such as the least-square fitting and the Levenberg-Marquardt algorithm (LMA) are fast ... More
Divergence-free H(div)-conforming hierarchical bases for magnetohydrodynamics (MHD)Oct 20 2012Jan 31 2013In order to solve the magnetohydrodynamics (MHD) equations with a $\mathbf{\mathcal{H}}(\mathbf{div})$-conforming element, a novel approach is proposed to ensure the exact divergence-free condition on the magnetic field. The idea is to add on each element ... More
Raman modes of the deformed single-wall carbon nanotubesJul 30 2007With the empirical bond polarizability model, the nonresonant Raman spectra of the chiral and achiral single-wall carbon nanotubes (SWCNTs) under uniaxial and torsional strains have been systematically studied by \textit{ab initio} method. It is found ... More
Joule heating and thermoelectric properties in short single-walled carbon nanotubes: electron-phonon interaction effectAug 30 2011Nov 19 2011The electron-phonon interaction (EPI) effect in single-walled carbon nanotube is investigated by the nonequilibrium Green's function approach within the Born approximation. Special attention is paid to the EPI induced Joule heating phenomenon and the ... More
Fast and Quality-Guaranteed Data Streaming in Resource-Constrained Sensor NetworksNov 28 2008In many emerging applications, data streams are monitored in a network environment. Due to limited communication bandwidth and other resource constraints, a critical and practical demand is to online compress data streams continuously with quality guarantee. ... More
Quantum discord and its asymptotic behaviors in a time-dependent XY spin chainJul 16 2012We study the dynamics and the asymptotic behaviors of quantum discord in a one-dimensional XY model coupled through time-dependent nearest-neighbor interactions and in the presence of a time-dependent magnetic field. We find that the time evolution of ... More
Mutual Exclusion Statistics Between Quasiparticles in the Fractional Quantum Hall EffectAug 19 1996Aug 21 1996In this paper we propose a new assignment for mutual exclusion statistics between quasielectrons and quasiholes in the fractional quantum Hall effect. In addition to providing numerical evidence for this assignment, we show that the physical origin of ... More
Word Mover's Embedding: From Word2Vec to Document EmbeddingOct 30 2018While the celebrated Word2Vec technique yields semantically rich representations for individual words, there has been relatively less success in extending to generate unsupervised sentences or documents embeddings. Recent work has demonstrated that a ... More
The Effects of Research Level and Article Type on the Differences between Citation Metrics and F1000 RecommendationsJan 06 2015Mar 11 2015F1000 recommendations have been validated as a potential data source for research evaluation, but reasons for differences between F1000 Article Factor (FFa scores) and citations remain to be explored. By linking 28254 publications in F1000 to citations ... More
Pinching estimates for solutions of the linearized Ricci flow system in higher dimensionsMar 28 2013Feb 18 2016We prove pinching estimates for solutions of the linearized Ricci flow system on a closed manifold of dimension $n\geq 4$ with positive scalar curvature and vanishing Weyl tensor. If the vanishing Weyl tensor condition is removed, we only give a rough ... More
Transport of active ellipsoidal particles in ratchet potentialsMay 10 2015Rectified transport of active ellipsoidal particles is numerically investigated in a two-dimensional asymmetric potential. The out-of-equilibrium condition for the active particle is an intrinsic property, which can break thermodynamical equilibrium and ... More