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Results for "Ming Gong"

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FFLO or Majorana superfluids: The fate of fermionic cold atoms in spin-orbit coupled optical latticesApr 14 2013Jul 10 2013The recent experimental realization of spin-orbit coupling (SOC) for ultra-cold atoms opens a completely new avenue for exploring new quantum matter. In experiments, the SOC is implemented simultaneously with a Zeeman field. Such spin-orbit coupled Fermi ... More
Current cosmological constraints on the curvature, dark energy and modified gravityAug 30 2010Jul 26 2011We apply the Union2 compilation of 557 supernova Ia data, the baryon acoustic oscillation measurement of distance, the cosmic microwave background radiation data from the seven year Wilkinson Microwave Anisotropy Probe, and the Hubble parameter data to ... More
Exciton polarization, fine structure splitting and quantum dot asymmetry under uniaxial stressDec 13 2010May 03 2011We derive a general relation between the fine structure splitting (FSS) and the exciton polarization angle of self-assembled quantum dots (QDs) under uniaxial stress. We show that the FSS lower bound under external stress can be predicted by the exciton ... More
Atomistic theory of spin relaxation in self-assembled In$_{1-x}$Ga$_x$As/GaAs quantum dots at zero magnetic fieldNov 22 2010We present full atomistic calculations of the spin-flip time (T$_{1}$) of electrons and holes mediated by acoustic phonons in self-assembled In$_{1-x}$Ga$_x$As/GaAs quantum dots at zero magnetic field. At low magnetic field, the first-order process is ... More
Dynamical instability towards finite-momentum pairing in quenched BCS superconducting phasesOct 22 2018In this work we numerically investigate the fate of the Bardeen-Cooper-Schrieffer (BCS) pairing in the presence of quenched phase under Peierls substitution using time-dependent real space and momentum space Bogoliubov-de Gennes equation methods and Anderson ... More
Compressing Deep Convolutional Networks using Vector QuantizationDec 18 2014Deep convolutional neural networks (CNN) has become the most promising method for object recognition, repeatedly demonstrating record breaking results for image classification and object detection in recent years. However, a very deep CNN generally involves ... More
Competing superfluid orders in spin-orbit coupled fermionic cold atom optical latticesMay 09 2013Feb 21 2014The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase, a superconducting state with non-zero total momentum Cooper pairs in a large magnetic field, was first predicted about 50 years ago, and since then became an important concept in many branches of physics. ... More
Observation of Zitterbewegung in a spin-orbit coupled Bose-Einstein condensateJan 04 2013Aug 27 2013Spin-orbit coupled ultra-cold atoms provide an intriguing new avenue for the study of rich spin dynamics in superfluids. In this Letter, we observe Zitterbewegung, the simultaneous velocity (thus position) and spin oscillations, of neutral atoms between ... More
Temperature Dependent Empirical Pseudopotential Theory For Self-Assembled Quantum DotsMar 13 2012We develop a temperature dependent empirical pseudopotential theory to study the electronic and optical properties of self-assembled quantum dots (QDs) at finite temperature. The theory takes the effects of both lattice expansion and lattice vibration ... More
Towards scalable entangled photon sources with self-assembled InAs/GaAs quantum dotsDec 09 2014Biexciton cascade process in self-assembled quantum dots (QDs) provides an ideal system for deterministic entangled photon pair source, which is essential in quantum information science. The entangled photon pairs have recently be realized in experiments ... More
Route to Observable Fulde-Ferrell-Larkin-Ovchinnikov Phases in 3D Spin-Orbit Coupled Degenerate Fermi GasesAug 09 2012Feb 21 2013The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase was first predicted in 2D superconductors about 50 years ago, but so far unambiguous experimental evidences are still lacked. The recently experimentally realized spin-imbalanced Fermi gases may potentially ... More
Searching for Majorana Fermions in 2D Spin-orbit Coupled Fermi Superfluids at Finite TemperatureJan 11 2012Aug 28 2012Recent experimental breakthrough in realizing spin-orbit (SO) coupling for cold atoms has spurred considerable interest in the physics of 2D SO coupled Fermi superfluids, especially topological Majorana fermions (MFs) which were predicted to exist at ... More
Anomalous isothermal compressibility in spin-orbit coupled degenerate Fermi gasesSep 08 2018The spin-orbit coupling (SOC) in degenerate Fermi gases can fundamentally change the fate of $s$-wave superfluids with strong Zeeman field and give rise to topological superfluids and associated Majorana zero modes. It also dramatically changes the thermodynamic ... More
Naturally Combined Shape-Color Moment Invariants under Affine TransformationsMay 31 2017Jul 27 2017We proposed a kind of naturally combined shape-color affine moment invariants (SCAMI), which consider both shape and color affine transformations simultaneously in one single system. In the real scene, color and shape deformations always exist in images ... More
A general study on the volume dependence of spectral weights in lattice field theorySep 17 2009It has been suggested that the volume dependence of the spectral weight could be utilized to distinguish single and multi-particle states in Monte Carlo simulations. In a recent study using a solvable model, the Lee model, we found that this criteria ... More
Symmetry-enriched Bose-Einstein condensates in spin-orbit coupled bilayer systemJun 20 2017We consider the fate of Bose-Einstein condensation (BEC) with time-reversal symmetry and inversion symmetry in a spin-orbit coupled bilayer system. When these two symmetry operators commute, all the single particle bands are exactly two-fold degenerate ... More
A mini review on NiFe-based materials as highly active oxygen evolution reaction electrocatalystsNov 14 2014Oxygen evolution reaction (OER) electrolysis, as an important reaction involved in water splitting and rechargeable metal-air battery, has attracted increasing attention for clean energy generation and efficient energy storage. Nickel/iron (NiFe)-based ... More
Superpixel HierarchyMay 20 2016Superpixel segmentation is becoming ubiquitous in computer vision. In practice, an object can either be represented by a number of segments in finer levels of detail or included in a surrounding region at coarser levels of detail, and thus a superpixel ... More
Charmonium production in ultra-peripheral heavy ion collisions with two-photon processesMar 20 2017We calculate the production of large-pTcharmonium and narrow resonance state (exotic charmonium) in proton-proton, proton-nucleus, and nucleus-nucleus collisions with the semi-coherent two-photon interactions at Relativistic Heavy Ion Collider (RHIC), ... More
Gapped topological Fulde-Ferrell-Larkin-Ovchinnikov superfluids with artificial gauge potential and weak interactionDec 25 2017The topological superfluids with Majorana zero modes have not yet been realized in ultracold atoms with Rashba spin-orbit coupling. Here we show that these phases can be realized with an artificial gauge potential, which can be regarded as a site-dependent ... More
Cavity-mediated oscillating and trapping dynamics in a two-component condensateJul 16 2018Cold atoms in cavity provides a new platform for exploring exotic many-body phases. Here we explore the dynamics of a two-component condensate coupled to a finesse cavity, in which the Raman coupling is mediated by pumping laser and cavity mode. In this ... More
Atomistic pseudopotential calculations of the optical properties of InAs/InP self-assembled quantum dotsOct 12 2010We present a comprehensive study of the optical properties of InAs/InP self-assembled quantum dots (QDs) using an empirical pseudopotential method and configuration interaction treatment of the many-particle effects. The results are compared to those ... More
Demonstrating nonlocality induced teleportation through Majorana bound states in a semiconductor nanowireAug 18 2012Dec 13 2013It was predicted by Tewari [Phys. Rev. Lett. {\bf 100}, 027001 (2008)] that a teleportationlike electron transfer phenomenon is one of the novel consequences of the existence of Majorana fermion, because of the inherently nonlocal nature. In this work ... More
Stochastic method with low mode substitution for nucleon isovector matrix elementsSep 15 2015Jan 23 2016We introduce a stochastic sandwich method with low-mode substitution to evaluate the connected three-point functions. The isovector matrix elements of the nucleon for the axial-vector coupling $g_A^3$, scalar couplings $g_S^3$ and the quark momentum fraction ... More
Highly-reduced Fine-structure splitting in InAs/InP quantum dots offering efficient on-demand 1.55 $μ$m entangled photon emitterJun 03 2008To generate entangled photon pairs via quantum dots (QDs), the exciton fine structure splitting (FSS) must be comparable to the exciton homogeneous line width. Yet in the (In,Ga)As/GaAs QD, the intrinsic FSS is about a few tens $\mu$eV. To achieve photon ... More
Quantum statistical imaging of particles without restriction of the diffraction limitOct 09 2012Feb 21 2013A practical quantum measurement method based on the quantum nature of anti-bunching photon emission has been developed to detect single particles without the restriction of the diffraction limit. By simultane- ously counting the single-photon and two-photon ... More
Fulde-Ferrell-Larkin-Ovchinnikov Phases in Two-dimensional Spin-Orbit Coupled Degenerate Fermi GasesDec 31 2012Nov 20 2013The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase, a superconducting state with non-zero total momentum Cooper pairs in a strong magnetic field, was predicted more than 50 years ago and now becomes an important concept in many branches of physics. However, ... More
Proposal for quantum many-body simulation and torsional matter-wave interferometry with a levitated nanodiamondNov 17 2016Aug 14 2017Hybrid spin-mechanical systems have great potentials in sensing, macroscopic quantum mechanics, and quantum information science. In order to induce strong coupling between an electron spin and the center-of-mass motion of a mechanical oscillator, a large ... More
Quark spins and Anomalous Ward IdentityJun 21 2018Nov 02 2018We calculate the intrinsic quark spin contribution to the total proton spin using overlap valence quarks on three ensembles of $2+1$-flavor RBC/UKQCD domain-wall configurations with different lattice spacings. The lowest pion mass of the ensembles is ... More
A salt and pepper noise image denoising method based on the generative classificationJul 15 2018In this paper, an image denoising algorithm is proposed for salt and pepper noise. First, a generative model is built on a patch as a basic unit and then the algorithm locates the image noise within that patch in order to better describe the patch and ... More
Entanglement dynamics of photon pairs emitted from quantum dotApr 22 2010Jun 03 2010We present a model to derive the state of the photon pairs generated by the biexciton cascade decay of a self-assembled quantum dot, which agrees well with the experimental result. Furthermore we calculate the concurrence and entanglement sudden death ... More
CREST: Convolutional Residual Learning for Visual TrackingAug 01 2017Discriminative correlation filters (DCFs) have been shown to perform superiorly in visual tracking. They only need a small set of training samples from the initial frame to generate an appearance model. However, existing DCFs learn the filters separately ... More
Heavy quarkonium photoproduction in ultrarelativistic heavy ion collisionsMar 09 2017Jun 11 2017Based on the factorization formalism of nonrelativistic quantum chromodynamics (NRQCD), we calculate the production cross section for the charmonium and the bottomonium produced by the hard photoproduction processes and fragmentation processes in relativistic ... More
Bose-Einstein condensate in Bloch bands with off-diagonal periodic potentialFeb 03 2019We report the Bose-Einstein condensate (BEC) in the Bloch bands with off-diagonal periodic potential (ODPP), which simultaneously plays the role of spin-orbit coupling (SOC) and Zeeman field. This model can be realized using two independent Raman couplings ... More
Angular momentum Josephson effect between two isolated condensatesJan 31 2019Feb 17 2019We demonstrate that the two degenerate energy levels in spin-orbit coupled trapped Bose gases, coupled by a quenched Zeeman field, can be used for angular momentum Josephson effect. In a static quenched field, we can realize a Josephson oscillation with ... More
Instance-level Human Parsing via Part Grouping NetworkAug 01 2018Instance-level human parsing towards real-world human analysis scenarios is still under-explored due to the absence of sufficient data resources and technical difficulty in parsing multiple instances in a single pass. Several related works all follow ... More
Tracking Persons-of-Interest via Unsupervised Representation AdaptationOct 05 2017Multi-face tracking in unconstrained videos is a challenging problem as faces of one person often appear drastically different in multiple shots due to significant variations in scale, pose, expression, illumination, and make-up. Existing multi-target ... More
Tunneling Spectroscopy of Atomically-Thin Al2O3 Films for Tunnel JunctionsJan 27 2017Metal-Insulator-Metal tunnel junctions (MIMTJ) are common throughout the microelectronics industry. The industry standard AlOx tunnel barrier, formed through oxygen diffusion into an Al wetting layer, is plagued by internal defects and pinholes which ... More
Cognitive Beamforming for Multiple Secondary Data Streams With Individual SNR ConstraintsMay 26 2013In this paper, we consider cognitive beamforming for multiple secondary data streams subject to individual signal-to-noise ratio (SNR) requirements for each secondary data stream. In such a cognitive radio system, the secondary user is permitted to use ... More
Fixed points in interacting dark energy modelsNov 11 2008Apr 04 2009The dynamical behaviors of two interacting dark energy models are considered. In addition to the scaling attractors found in the non-interacting quintessence model with exponential potential, new accelerated scaling attractors are also found in the interacting ... More
Observation of coherent oscillation in single-passage Landau-Zener transitionsFeb 03 2015Landau-Zener transition (LZT) has been explored in a variety of physical systems for coherent population transfer between different quantum states. In recent years, there have been various proposals for applying LZT to quantum information processing because ... More
Joint Face Hallucination and Deblurring via Structure Generation and Detail EnhancementNov 22 2018We address the problem of restoring a high-resolution face image from a blurry low-resolution input. This problem is difficult as super-resolution and deblurring need to be tackled simultaneously. Moreover, existing algorithms cannot handle face images ... More
Constraints on a new alternative model to dark energyFeb 05 2004Nov 17 2004The recent type Ia supernova data suggest that the universe is accelerating now and decelerated in recent past. This may provide the evidence that the standard Friedmann equation needs to be modified. We analyze in detail a new model in the context of ... More
Meson Mass DecompositionNov 04 2014Hadron masses can be decomposed as a sum of components which are defined through hadronic matrix elements of QCD operators. The components consist of the quark mass term, the quark energy term, the glue energy term and the trace anomaly term. We calculate ... More
VITAL: VIsual Tracking via Adversarial LearningApr 12 2018The tracking-by-detection framework consists of two stages, i.e., drawing samples around the target object in the first stage and classifying each sample as the target object or as background in the second stage. The performance of existing trackers using ... More
Emergent Haldane phase in an alternating bond $\mathbb{Z}_3$ parafermion chainMay 29 2018The Haldane phase represents one of the most important symmetry protected states in modern physics. This state can be realized using spin-1 and spin-${1\over 2}$ Heisenberg models and bosonic particles. Here we explore the emergent Haldane phase in an ... More
Topological phase, supercritical point and emergent phenomena in extended $\mathbb{Z}_3$ parafermion chainJan 10 2018Mar 28 2018Topological orders and associated topological protected excitations satisfying non-Abelian statistics have been widely explored in various platforms. The $\mathbb{Z}_3$ parafermions are regarded as the most natural generation of the Majorana fermions ... More
Phase Compensation Enhancement of Photon Pair Entanglement Generated from Biexciton Decays in Quantum DotsSep 01 2009Apr 05 2010Exciton fine-structure splittings within quantum dots introduce phase differences between the two biexciton decay paths that greatly reduce the entanglement of photon pairs generated via biexciton recombination. We analyze this problem in the frequency ... More
Efficient semiquantum key distributionNov 07 2018Nov 09 2018Quantum cryptography has attracted much attention in recent years. In most existing quantum cryptographic protocols, players usually need the full quantum power of generating, manipulating or measuring quantum states. Semiquantum cryptography was proposed ... More
BCS-BEC crossover in spin-orbit coupled two-dimensional Fermi gasesJul 13 2011Jan 04 2012The recent experimental realization of spin-orbit coupling for ultra-cold atoms has generated much interest in the physics of spin-orbit coupled degenerate Fermi gases. Although recently the BCS-BEC crossover in three-dimensional (3D) spin-orbit coupled ... More
LOCld65, A Dual-Channel VCSEL Driver ASIC For Detector Front-End ReadoutJun 22 2018We present the design and the test results of a dual-channel Vertical-Cavity Surface-Emitting Laser (VCSEL) driver ASIC LOCld65 for detector front-end readout. LOCld65 is designed in a commercial 65-nm CMOS technology with a power supply of 1.2 V. LOCld65 ... More
On the Products $(1^\ell+1)(2^\ell+1)\cdots (n^\ell +1)$, IINov 22 2013In this paper, the following results are proved: (i) For any odd integer $\ell$ with at most two distinct prime factors and any positive integer $n$, the product $(1^\ell+1)(2^\ell+1)\cdots (n^\ell +1)$ is not a powerful number; (ii) For any integer $r\ge ... More
Majorana Fermions in Semiconducting Nanowires on the Top of Fulde-Ferrell SuperconductorFeb 17 2014The novel idea that spin-orbit coupling (SOC) and $s$-wave pairing can lead to induced $p$-wave pairing at strong magnetic limit has stimulated widespread interests in the whole community for the searching of Majorana Fermions (MFs), a self-hermitian ... More
Many-body Landau-Zener Transition in Cold Atom Double Well Optical LatticesOct 07 2011Feb 04 2013Ultra-cold atoms in optical lattices provide an ideal platform for exploring many-body physics of a large system arising from the coupling among a series of small identical systems whose few-body dynamics is exactly solvable. Using Landau-Zener (LZ) transition ... More
BCS-BEC Crossover and Topological Phase Transition in 3D Spin-Orbit Coupled Degenerate Fermi GasesMay 09 2011Nov 06 2011We investigate the BCS-BEC crossover in three dimensional degenerate Fermi gases in the presence of spin-orbit coupling (SOC) and Zeeman field. We show that the superfluid order parameter destroyed by a large Zeeman field can be restored by the SOC. With ... More
Landau-Zener-Stuckelberg-Majorana interference in a 3D transmon driven by a chirped microwaveFeb 10 2016By driving a 3D transmon with microwave fields, we generate an effective avoided energy-level crossing. Then we chirp microwave frequency, which is equivalent to driving the system through the avoided energy-level crossing by sweeping the avoided crossing. ... More
A Ni-Fe Layered Double Hydroxide-Carbon Nanotube Complex for Water OxidationMar 13 2013May 24 2013Highly active, durable and cost-effective electrocatalysts for water oxidation to evolve oxygen gas hold a key to a range of renewable energy solutions including water splitting and rechargeable metal-air batteries. Here, we report the synthesis of ultrathin ... More
Non-perturbative renormalization of overlap quark bilinears on domain wall fermion configurationsDec 02 2013We present renormalization constants of overlap quark bilinear operators on 2+1-flavor domain wall fermion configurations. Both overlap and domain wall fermions have chiral symmetry on the lattice. The scale independent renormalization constant for the ... More
Charm and strange quark masses and $f_{D_s}$ from overlap fermionsOct 13 2014Jul 30 2015We use overlap fermions as valence quarks to calculate meson masses in a wide quark mass range on the $2+1$-flavor domain-wall fermion gauge configurations generated by the RBC and UKQCD Collaborations. The well-defined quark masses in the overlap fermion ... More
Quantum Transport of Bosonic Cold Atoms in Double Well Optical LatticesJan 28 2011Jun 29 2011We numerically investigate, using the time evolving block decimation algorithm, the quantum transport of ultra-cold bosonic atoms in a double well optical lattice through slow and periodic modulation of the lattice parameters (intra- and inter-well tunneling, ... More
Studies of the hydrodynamic evolution of the dense baryonic matter produced in relativistic heavy ion collisionsJul 07 2017Jul 10 2017We use the relativistic perfect-fluid hydrodynamics to describe the space-time evolution of dense baryonic matter produced in the central nucleus-nucleus collisions at HIRFL-CSR, HIAF, FAIR-CBM, NICA-MPD, and RHIC-BES. The transverse flow of the fireball ... More
Evolutionary Game Dynamics for Two Interacting Populations under Environmental FeedbackJun 08 2018We study the evolutionary dynamics of games under environmental feedback using replicator equations for two interacting populations. One key feature is to consider jointly the co-evolution of the dynamic payoff matrices and the state of the environment: ... More
Experimental demonstration of spontaneous chirality in a nonlinear microresonatorJul 06 2016Chirality is an important concept that describes the asymmetry property of a system, which usually emerges spontaneously due to mirror symmetry breaking. Such spontaneous chirality manifests predominantly as parity breaking in modern physics, which has ... More
Cosmology in massive gravityJul 11 2012Feb 26 2013We argue that more cosmological solutions in massive gravity can be obtained if the metric tensor and the tensor $\Sigma_{\mu\nu}$ defined by St\"{u}ckelberg fields take the homogeneous and isotropic form. The standard cosmology with matter and radiation ... More
Einstein-Brans-Dicke CosmologySep 03 1998Sep 03 1999We studied the Einstein-Brans-Dicke cosmology in detail. The difference of the evolution of the universe is significant between Einstein-Brans-Dicke cosmology and standard big-bang model during the radiation-dominated era. The power-law evolution of the ... More
Pretraining-Based Natural Language Generation for Text SummarizationFeb 25 2019In this paper, we propose a novel pretraining-based encoder-decoder framework, which can generate the output sequence based on the input sequence in a two-stage manner. For the encoder of our model, we encode the input sequence into context representations ... More
The same physics underlying SGRs, AXPs, and radio pulsarsApr 07 2005Jun 19 2005Unexpected sign, significant magnitude and time-variation of frequency second derivative exist not only in singular radio pulsars but also in Soft Gamma repeaters (SGRs) and Anomalous X-ray pulsars (AXPs). This paper shows that the these phenomena are ... More
Rigidity of Derivations in the Plane and in Metric Measure SpacesOct 19 2011Following Weaver we study generalized differential operators, called (metric) derivations, and their linear algebraic properties. In particular, for k = 1, 2 we show that measures on k-dimensional Euclidean space that induce rank-k modules of derivations ... More
Harvesting and storing laser energy with graphene-cu compound structureJul 13 2012Aug 15 2012Graphene-metal compound structure has been reported as a novel and outstanding component used in electrical and optical devices. We report on a first-principles study of graphene-cu compound structure, showing its capacity of converting laser energy into ... More
The non-ballistic superluminal motion in the plane of the skyJun 17 2008Faster-than-light or superluminal motion was originally predicted as a relativistic illusion of ballistic moving ejecta, and confirmed in a few tens of sources observationally. However, the recent results of the long-term multi-epoch observations of quasars, ... More
Divergence of the normalization for real Lagrangian surfaces near complex tangentsJun 29 1995We study real Lagrangian analytic surfaces in C^2 with a non-degenerate complex tangent. Webster proved that all such surfaces can be transformed into a quadratic surface by formal symplectic transformations of C^2. We show that there is a certain dense ... More
Holographic Bound in Brans-Dicke CosmologySep 03 1999Sep 13 1999We apply the holographic principle to the Brans-Dicke cosmology. We analyze the holographic bound in both the Jordan and Einstein frames. The holographic bound is satisfied for both the k=0 and k=-1 universe, but it is violated for the k=1 matter dominated ... More
The general property of dynamical quintessence fieldJan 09 2014Mar 14 2014We discuss the general dynamical behaviors of quintessence field, in particular, the general conditions for tracking and thawing solutions are discussed. We explain what the tracking solutions mean and in what sense the results depend on the initial conditions. ... More
Ramond-Ramond Field TransformationFeb 16 2000Mar 08 2000We find that the mixture of Ramond-Ramond fields and Neveu-Schwarz two form are transformed as Majorana spinors under the T-duality group $O(d,d)$. The Ramond-Ramond field transformation under the group $O(d,d)$ is realized in a simple form by using the ... More
An elementary approach to character sums over multiplicative subgroupsJan 18 2014Let $p$ be an odd prime. Using I. M. Vinogradov's bilinear estimate, we present an elementary approach to estimate nontrivially the character sum $$ \sum_{x\in H}\chi(x+a),\qquad a\in\Bbb F_p^*, $$ where $H<\Bbb F_p^*$ is a multiplicative subgroup in ... More
Property RD and the Classification of Traces on Reduced Group $C^*$-algebras of Hyperbolic GroupsFeb 01 2014Sep 29 2016In this paper, we show that if $G$ by a non-elementary word hyperbolic group and $a \in G$ an element, if the conjugacy class of $a$ is infinite, then all traces $\tau:C^*_{\text{red}}(G) \to \mathbb{C}$ vanish on $a$. We show that all traces $\theta:C^*_{\text{red}}(G) ... More
The Lip-lip condition on metric measure spacesAug 14 2012On complete metric spaces that support doubling measures, we show that the validity of a Rademacher theorem for Lipschitz functions can be characterised by Keith's "Lip-lip" condition. Roughly speaking, this means that at almost every point, the infinitesmal ... More
Detecting Fulde-Ferrell superconductors by an Andreev interferometerNov 19 2013Aug 12 2014We propose an Andreev interferometer, based on a branched Y-junction, to detect the finite momentum pairing in Fulde-Ferrell (FF) superconductors. In this interferometer, the oscillation of subgap conductance is a unique function of phase difference between ... More
Exotic Spin Phases in Two Dimensional Spin-orbit Coupled Models: Importance of Quantum Fluctuation EffectsJan 26 2017We investigate the phase diagrams of the effective spin models derived from Fermi-Hubbard and Bose-Hubbard models with Rashba spin-orbit coupling, using string bond states, one of the quantum tensor network states methods. We focus on the role of quantum ... More
Phase-space analysis of interacting phantom cosmologyDec 05 2008Mar 31 2009We perform a detailed phase-space analysis of various phantom cosmological models, where the dark energy sector interacts with the dark matter one. We examine whether there exist late-time scaling attractors, corresponding to an accelerating universe ... More
Strange quark momentum fraction from overlap fermionFeb 19 2015Mar 10 2015We present a calculation of $< x >_s$ for the strange quark in the nucleon. We also report the ratio of the strange $< x >$ to that of $u/d$ in the disconnected insertion which will be useful in constraining the global fit of parton distribution functions ... More
Spin-Orbit Driven Transitions Between Mott Insulators and Finite Momentum Superfluids of Bosons in Optical LatticesDec 14 2013Synthetic spin-orbit coupling in ultracold atomic gases can be taken to extremes rarely found in solids. We study a two dimensional Hubbard model of bosons in an optical lattice in the presence of spin-orbit coupling strong enough to drive direct transitions ... More
Artificial Light Harvesting by Dimerized Mobius RingJun 26 2017Jun 28 2017We theoretically study artificial light harvesting by a dimerized Mobius ring. When the donors in the ring are dimerized, the energies of the donor ring are splitted into two sub-bands. Because of the nontrivial Mobius boundary condition, both the photon ... More
Effects of Weak Ties on Epidemic Predictability in Community NetworksJul 04 2012Weak ties play a significant role in the structures and the dynamics of community networks. Based on the susceptible-infected model in contact process, we study numerically how weak ties influence the predictability of epidemic dynamics. We first investigate ... More
Investigation on energetic optimization problems of stochastic thermodynamics with iterative dynamic programmingDec 18 2009The energetic optimization problem, e.g., searching for the optimal switch- ing protocol of certain system parameters to minimize the input work, has been extensively studied by stochastic thermodynamics. In current work, we study this problem numerically ... More
Decouple Electronic and Phononic Transport in Nanotwinned Structure: A New Strategy for Enhancing the Figure-of-merit of ThermoelectricsMar 01 2017Thermoelectrics (TE) materials manifest themselves in direct conversion of temperature differences to electric power and vice versa. Despite remarkable advances have been achieved in the past decades for various TE systems, the energy conversion efficiencies ... More
Majorana fermions in quasi-1D and higher dimensional ultracold fermionic optical latticesOct 28 2013Jan 20 2014We show that Majorana fermions (MFs) exist in two- and three-dimensional (2D,3D) fermionic optical lattices with strictly 1D spin-orbit coupling (SOC) which has already been realized in ex- periments. For a quasi-1D topological BCS superfluid, there are ... More
The transient acceleration from time-dependent interacting dark energy modelsNov 29 2011Sep 20 2013The transient acceleration which the current cosmic acceleration is not eternal is possible by introducing the interaction between dark matter and dark energy. If the energy transfer is from dark energy to dark matter, then it is possible to realize the ... More
Type-I and type-II topological nodal superconductors with $s$-wave interactionJun 06 2017Topological nodal superconductors are generally realized based on unconventional pairings. In this work, we propose a minimal model to realize these topological nodal phases with only $s$-wave interaction. In our model the linear and quadratic spin-orbit ... More
Dynamical topological phases in quenched spin-orbit coupled degenerate Fermi gasJun 15 2014Jan 22 2015The spin-orbit coupled degenerate Fermi gas provides a totally new platform to realize topological superfluids and related topological excitations. Previous studies have mainly focused on the properties of the ground state. Here we consider a two-dimensional ... More
Weiqi games as a tree: Zipf's law of openings and beyondMar 11 2015Jun 23 2015Weiqi is one of the most complex board games played by two persons. The placement strategies adopted by Weiqi players are often used to analog the philosophy of human wars. Contrary to the western chess, Weiqi games are less studied by academics partially ... More
Simulating the Kibble-Zurek mechanism of the Ising model with a superconducting qubit systemMay 27 2015Feb 10 2016The Kibble-Zurek mechanism (KZM) predicts the density of topological defects produced in the dynamical processes of phase transitions in systems ranging from cosmology to condensed matter and quantum materials. The similarity between KZM and the Landau-Zener ... More
Group Invariant Weighing MatricesOct 06 2016Nov 28 2016We investigate the existence problem of group invariant matrices using algebraic approaches. We extend the usual concept of multipliers to group rings with cyclotomic integers as coefficients. This concept is combined with the field descent method and ... More
Heteronuclear magnetisms with ultracold spinor bosonic gases in optical latticesNov 03 2017Motivated by recent realizations of spin-1 NaRb mixtures in the experiments, here we investigate heteronuclear magnetism in the Mott-insulating regime. Different from the identical mixtures where the boson (fermion) statistics only admits even (odd) parity ... More
Large Chern Number Topological Superfluids in Coupled Layer SystemAug 13 2014Aug 30 2014We investigate the topological phase transition with large Chern number in a coupled layer system. The topological transitions between different topological superfluids can be realized by controlling the binding energy, interlay tunneling and layer asymmetry ... More
A new alternative model to dark energyApr 09 2004May 08 2004The recent observations of type Ia supernovae strongly support that the universe is accelerating now and decelerated in the recent past. This may be the evidence of the breakdown of the standard Friedmann equation. Instead of a linear function of the ... More
Group Invariant Weighing MatricesOct 06 2016Oct 07 2016We investigate the existence problem of group invariant matrices using algebraic approaches. We extend the usual concept of multipliers to group rings with cyclotomic integers as coefficients. This concept is combined with the field descent method and ... More
Quark Spin in Proton from Anomalous Ward IndentityApr 15 2015We report a quark spin calculation from the anomalous Ward identity with overlap fermions on 2+1 flavor dynamical fermion configurations with light sea quark masses. Such a formulation decomposes the divergence of the flavor-singlet axial-vector current ... More
Majorana Fermions Under Uniaxial Stress in Semiconductor-Superconductor HeterostructuresMay 28 2012Feb 04 2013Spin-orbit coupled semiconductor nanowires with Zeeman splitting in proximity contact with bulk $s$-wave superconductivity have recently been proposed as a promising platform for realizing Majorana fermions. However, in this setup the chemical potential ... More
Hole-doped semiconductor nanowire on top of an s-wave superconductor: A new and experimentally accessible system for Majorana fermionsMay 17 2011Mar 14 2012Majorana fermions were envisioned by E. Majorana in 1935 to describe neutrinos. Recently it has been shown that they can be realized even in a class of electron-doped semiconductors, on which ordinary s-wave superconductivity is proximity induced, provided ... More