Results for "X. -L. Peng"

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Parameter estimation and model testing for Markov processes via conditional characteristic functionsFeb 01 2013Markov processes are used in a wide range of disciplines, including finance. The transition densities of these processes are often unknown. However, the conditional characteristic functions are more likely to be available, especially for L\'{e}vy-driven ... More
The properties of kaonic nuclei in relativistic mean-field theoryAug 17 2005Oct 13 2006The static properties of some possible light and moderate kaonic nuclei, from C to Ti, are studied in the relativistic mean-field theory. The 1s and 1p state binding energies of $K^-$ are in the range of $73\sim 96$ MeV and $22\sim 63$ MeV, respectively. ... More
Microwave programmable response of Co-based microwire polymer composites through wire microstructure and arrangement optimizationApr 13 2019Traditional approaches to realize microwave tunability in microwire polymer composites which mainly rely on topological factors, magnetic field/stress stimuli, and hybridization prove to be burdensome and restricted to rather narrow band frequencies. ... More
Chiral condensates and size of the sigma termDec 28 2004The in-medium chiral condensate is studied with a new approach which has the advantage of no need for extra assumptions on the current mass derivatives of model parameters. It is shown that the pion-nucleon sigma term is 9/2 times the average current ... More
Renormalization group dependence of the QCD couplingJan 09 2006The general relation between the standard expansion coefficients and the beta function for the QCD coupling is exactly derived in a mathematically strict way. It is accordingly found that an infinite number of logarithmic terms are lost in the standard ... More
The Temporal and Spectral Characteristics of "Fast Rise and Exponential Decay" Gamma-Ray Burst PulsesJun 08 2010In this paper we have analyzed the temporal and spectral behavior of 52 Fast Rise and Exponential Decay (FRED) pulses in 48 long-duration gamma-ray bursts (GRBs) observed by the CGRO/BATSE, using a pulse model with two shape parameters and the Band model ... More
The $E_{p}$ Evolutionary Slope within the Decay Phase of "FRED" Gamma-ray Burst PulsesMar 20 2009Employing two samples containing of 56 and 59 well-separated FRED (fast rise and exponential decay) gamma-ray burst (GRB) pulses whose spectra are fitted by the Band spectrum and Compton model, respectively, we have investigated the evolutionary slope ... More
Magnetoresistance of metallic perovskite oxide LaNiO$_{3-δ}$Jul 24 1998We report a study of the magnetoresistance (MR) of the metallic perovskite oxide LaNiO$_{3-\delta}$ as a function of the oxygen stoichiometry $\delta$ ($\delta \leq$ 0.14), magnetic field (H $\leq 6T$) and temperature (1.5K $\leq $ T $\leq $ 25K). We ... More
Photons from the Early Stages of Relativistic Heavy Ion CollisionsMar 01 2017Aug 01 2017We present results about photons production in relativistic heavy ion collisions. The main novelty of our study is the calculation of the contribution of the early stage photons to the photon spectrum. The initial stage is modeled by an ensemble of classical ... More
Mass formulas and thermodynamic treatment in the mass-density-dependent model of strange quark matterNov 03 1999Nov 04 1999The previous treatments for strange quark matter in the quark mass-density-dependent model have unreasonable vacuum limits. We provide a method to obtain the quark mass parametrizations and give a self-consistent thermodynamic treatment which includes ... More
Photoluminescence properties of forsterite (Mg2SiO4) nanobelts synthesized from Mg and SiO2 powdersOct 23 2003Ternary oxide forsterite Mg2SiO4 single-crystalline nanobelts have been synthesized at high yields via SiO2 assistant-oxide through a VS process. The PL properties of the forsterite Mg2SiO4 nanobelts were observed. The emission peak at 625 nm is attributed ... More
Neutron Transversity at Jefferson LabNov 17 2005Nucleon transversity and single transverse spin asymmetries have been the recent focus of large efforts by both theorists and experimentalists. On-going and planned experiments from HERMES, COMPASS and RHIC are mostly on the proton or the deuteron. Presented ... More
Spectral lag of gamma-ray burst caused by the intrinsic spectral evolution and the curvature effectJan 21 2011Assuming an intrinsic `Band' shape spectrum and an intrinsic energy-independent emission profile we have investigated the connection between the evolution of the rest-frame spectral parameters and the spectral lags measured in gamma-ray burst (GRB) pulses ... More
Is the energy generation rate of nuclear reactions in hot accretion flows important?Jun 15 2009The temperature of hot accretion flows around black holes is sufficiently high for the ignition of nuclear reactions. This is potentially an important nucleosynthesis mechanism in the universe. As the first step in studying this problem, we need to measure ... More
First-principles study of a novel superhard boron nitride phaseApr 10 2012Jun 11 2012A superhard boron nitride phase dubbed as Z-BN is proposed as possible intermediate phase between h-BN and zinc blende BN (c-BN), and investigated using first-principles calculations within the framework of the density functional theory. Although the ... More
Four superhard carbon allotropes: First-principle studyMar 27 2012Apr 19 2012Using a generalized genetic algorithm, we propose four new sp3 carbon allotropes with 5-6-7 (5-6-7-type Z-ACA and Z-CACB) or 4-6-8(4-6-8-type Z4-A3B1 and A4-A2B2) carbon rings. Their stability, mechanical and electronic properties are systematically studied ... More
Proximity and anomalous field-effect characteristics in double-wall carbon nanotubesMar 22 2006Proximity effect on field-effect characteristic (FEC) in double-wall carbon nanotubes (DWCNTs) is investigated. In a semiconductor-metal (S-M) DWCNT, the penetration of electron wavefunctions in the metallic shell to the semiconducting shell turns the ... More
Strange matter and strange stars in a thermodynamically self-consistent perturbation model with running coupling and running strange quark massDec 27 2015A quark model with running coupling and running strange quark mass, which is thermodynamically self-consistent at both high and lower densities, is presented and applied to study properties of strange quark matter and structure of compact stars. An additional ... More
Energy-Dependent GRB Pulse Width due to the Curvature Effect and Intrinsic Band SpectrumApr 16 2012Previous studies have found that the width of gamma-ray burst (GRB) pulse is energy dependent and that it decreases as a power-law function with increasing photon energy. In this work we have investigated the relation between the energy dependence of ... More
New Superhard Carbon Phases Between Graphite and DiamondMar 25 2012Jun 11 2012Two new carbon allotropes (H-carbon and S-carbon) are proposed, as possible candidates for the intermediate superhard phases between graphite and diamond obtained in the process of cold compressing graphite, based on the results of first-principles calculations. ... More
Evolution of pressures and correlations in the Glasma produced in high energy nuclear collisionsJul 25 2017Mar 19 2018We consider the SU(2) Glasma with gaussian fluctuations and study its evolution by means of classical Yang-Mills equations solved numerically on a lattice. Neglecting in this first study the longitudinal expansion we follow the evolution of the pressures ... More
Critical Temperature of Chiral Symmetry Restoration for Quark Matter with a Chiral Chemical PotentialFeb 17 2016Sep 27 2016In this article we study restoration of chiral symmetry at finite temperature for quark matter with a chiral chemical potential, $\mu_5$, by means of a nonlocal Nambu-Jona-Lasinio model. This model allows to introduce in the simplest way possible a Euclidean ... More
Quark Matter in a Parallel Electric and Magnetic Field Background: Chiral Phase Transition and Equilibration of Chiral DensityFeb 29 2016May 24 2016In this article we study spontaneous chiral symmetry breaking for quark matter in the background of static and homogeneous parallel electric field $\bm E$ and magnetic field $\bm B$. We use a Nambu-Jona-Lasinio model with a local kernel interaction to ... More
Critical Temperature of Chiral Symmetry Restoration for Quark Matter with a Chiral Chemical PotentialFeb 11 2016In this article we study restoration of chiral symmetry at finite temperature for quark matter with a chiral chemical potential, $\mu_5$, by means of a quark-meson model with vacuum fluctuations included. Vacuum fluctuations give a divergent contribution ... More
Pulsar slow glitches in a solid quark star modelAug 18 2007Oct 13 2007A series of five unusual slow glitches of the radio pulsar B1822-09 (PSR J1825-0935) were observed over the 1995-2005 interval. This phenomenon is understood in a solid quark star model, where the reasonable parameters for slow glitches are presented ... More
A distortion solution for the Bok telescope with four CCD chipsFeb 28 2019The Beijing-Arizona Sky Survey (BASS) is an imaging survey and uses the 2.3 m Bok telescope at Kitt Peak. In order to tap the astrometric potential of the Bok telescope and improve the astrometry of BASS, a distortion solution for the Bok telescope is ... More
Quantum simulation of artificial Abelian gauge field using nitrogen-vacancy center ensembles coupled to superconducting resonatorsApr 09 2012We propose a potentially practical scheme to simulate artificial Abelian gauge field for polaritons using a hybrid quantum system consisting of nitrogen-vacancy center ensembles (NVEs) and superconducting transmission line resonators (TLR). In our case, ... More
Optomechanically-Induced Transparency in partiy-time-symmetric microresonatorsNov 26 2014Mar 30 2015Optomechanically-induced transparency (OMIT) and the associated slowing of light provide the basis for storing photons in nanoscale devices. Here we study OMIT in parity-time (PT)-symmetric microresonators with a tunable gain-to-loss ratio. This system ... More
Enhanced superconductivity accompanying a Lifshitz transition in electron-doped FeSe monolayerJun 05 2016The origin of enhanced superconductivity over 50 K in the recently discovered FeSe monolayer films grown on SrTiO$_{3}$ (STO), as compared to 8 K in bulk FeSe, is intensely debated. As with the ferrochalcogenides A$_{x}$Fe$_{2-y}$Se$_{2}$ and potassium ... More
Observation of topological transition in high-T$_{c}$ superconductor FeTe$_{1-x}$Se$_{x}$/SrTiO$_{3}$(001) monolayersMar 14 2019Superconductors with topological surface or edge states have been intensively explored for the prospect of realizing Majorana bound states, which obey non-Abelian statistics and are crucial for topological quantum computation. The traditional routes for ... More
Non-Wigner-Dyson level statistics and fractal wavefunction of disordered Weyl semimetalsOct 01 2018Mar 23 2019Finding fingerprints of disordered Weyl semimetals (WSMs) is an unsolved task. Here we report such findings in the level statistics and the fractal nature of electron wavefunction around Weyl nodes of disordered WSMs. The nearest-neighbor level spacing ... More
Topologically entangled Rashba-split Shockley states on the surface of grey arsenicAug 10 2016Feb 06 2017We discover a pair of spin-polarized surface bands on the (111) face of grey arsenic by using angle-resolved photoemission spectroscopy (ARPES). In the occupied side, the pair resembles typical nearly-free-electron Shockley states observed on noble-metal ... More
Chiral Relaxation Time at the Crossover of Quantum ChromodynamicsJun 10 2016Aug 30 2016We study microscopic processes responsible for chirality flips in the thermal bath of Quantum Chromodynamics at finite temperature and zero baryon chemical potential. We focus on the temperature range where the crossover from chirally broken phase to ... More
Mass formulae and strange quark matterJun 09 1997Dec 01 1997We have derived the popularly used parametrization formulae for quark masses at low densities and modified them at high densities within the mass-density-dependent model. The results are applied to investigate the lowest density for the possible existence ... More
Post-Lasso Inference for High-Dimensional RegressionJun 16 2018Among the most popular variable selection procedures in high-dimensional regression, Lasso provides a solution path to rank the variables and determines a cut-off position on the path to select variables and estimate coefficients. In this paper, we consider ... More
A new treatment of the in-medium chiral condensatesSep 26 2003A new formalism to calculate the in-medium chiral condensate is presented. At lower densities, this approach leads to a linear expression. If we demand a compatibility with the famous model-independent result, then the pion-nucleon sigma term should be ... More
Color-flavor locked strangelets in a quark mass density-dependent modelDec 20 2006The color-flavor locked (CFL) phase of strangelets is investigated in a quark mass density-dependent model. Parameters are determined by stability arguments. It is concluded that three solutions to the system equations can be found, corresponding, respectively, ... More
Achievement of FCC specification in critical current density for Nb3Sn superconductors with artificial pinning centersMar 19 2019Mar 27 2019In this letter we demonstrate achievement of record non-Cu critical current density (Jc,non-Cu) in ternary, multifilamentary Nb3Sn conductors by the introduction of artificial pinning centers (APC). In the past two years, we have made great progress in ... More
Topologically entangled Rashba-split bands on the grey arsenic surfaceAug 10 2016Rashba-split states are discovered on the surfaces of many semi-infinite single crystals. They are generally explained based on the Rashba theory, considering spin-orbit coupling (SOC) and inversion symmetry breaking on the surface. Here we investigate ... More
Achievement of FCC specification in critical current density for Nb3Sn superconductors with artificial pinning centersMar 19 2019Mar 20 2019In this letter we demonstrate achievement of record non-Cu critical current density (Jc,non-Cu) in ternary, multifilamentary Nb3Sn conductors by the introduction of artificial pinning centers (APC). In the past two years, we have made great progress in ... More
Achievement of FCC specification in critical current density for Nb3Sn superconductors with artificial pinning centersMar 19 2019Mar 25 2019In this letter we demonstrate achievement of record non-Cu critical current density (Jc,non-Cu) in ternary, multifilamentary Nb3Sn conductors by the introduction of artificial pinning centers (APC). In the past two years, we have made great progress in ... More
Refinement of Nb3Sn grain size by the generation of ZrO2 precipitates in Nb3Sn wiresFeb 12 2014Feb 21 2014In this letter we demonstrate that if oxygen can be properly supplied to (Nb-Zr)-Sn wires, ZrO2 precipitates will form during the heat treatment, refining the Nb3Sn grain size markedly. Here, a Nb3Sn subelement was fabricated in which Nb-1Zr alloy was ... More
A new method for protein structure reconstruction from NOESY distancesMay 29 2018Sep 20 2018Protein structure reconstruction from Nuclear Magnetic Resonance (NMR) experiments largely relies on computational algorithms. Recently, some effective low-rank matrix completion (MC) methods, such as ASD and ScaledASD, have been successfully applied ... More
Non-Wigner-Dyson level statistics and fractal wavefunction of disordered Weyl semimetalsOct 01 2018The level statistics and the fractal nature of electron wavefunction around Weyl nodes of disordered Weyl semimetals are numerically investigated. The nearest-neighbor level spacing follows a new universal distribution $P_c(s)=C_1 s^2\exp[-C_2 s^{2-\gamma_0}]$ ... More
Massive hybrid stars with a first order phase transitionMar 10 2015We develop our previous study of the transition to deconfined quark phase in neutron stars, including the interaction in the quark equation of state to the leading order in the perturbative expansion within the confinement density-dependent mass model. ... More
Observation of high-Tc superconductivity in rectangular FeSe/STO(110) monolayerDec 07 2015It is well known that superconductivity in Fe-based materials is favoured under tetragonal symmetry, whereas competing orders such as spin-density-wave (SDW) and nematic orders emerge or are reinforced upon breaking the fourfold (C4) symmetry. Accordingly, ... More
Deconfinement phase transition in hybrid neutron stars from the Brueckner theory with three-body forces and a quark model with chiral mass scalingJul 01 2008We study the properties of strange quark matter in equilibrium with normal nuclear matter. Instead of using the conventional bag model in quark sector, we achieve the confinement by a density-dependent quark mass derived from in-medium chiral condensates. ... More
Achievement of FCC specification in critical current density for Nb3Sn superconductors with artificial pinning centersMar 19 2019In this letter we demonstrate achievement of record non-Cu critical current density (Jc,non-Cu) in ternary, multifilamentary Nb3Sn conductors by the introduction of artificial pinning centers (APC). In the past two years, we have made great progress in ... More
Charge, strangeness and radius of strangeletsMay 22 2007We investigate, at both zero and finite temperature, the properties of strangelets versus the electric charge Z and strangeness S. The strangelet radius is not a monotonic function of either charge or strangeness, and a minimum is reached in the (Z, S) ... More
New solutions for the color-flavor locked strangeletsDec 09 2005Recent publications rule out the negatively charged beta equilibrium strangelets in ordinary phase, and the color-flavor locked (CFL) strangelets are reported to be also positively charged. This letter presents new solutions to the system equations where ... More
Born-Oppenheimer approximation in open systemsMay 17 2009Sep 16 2009We generalize the standard Born-Oppenheimer approximation to the case of open quantum systems. We define the zeroth order Born-Oppenheimer approximation of an open quantum system as the regime in which its effective Hamiltonian can be diagonalized with ... More
Non-Markovian Effects on the Geometric PhaseNov 07 2008The geometric phases of a two-level atom interacting with non-Markovian environments are calculated and the non-Markovian effects on the geometric phases are discussed in this paper. Three kinds of methods that describe the non-Markovian process, projection ... More
Enhanced superconductivity and evidence for novel pairing in single-layer FeSe on SrTiO3 thin film under large tensile strainOct 11 2013Single-layer FeSe films with extremely expanded in-plane lattice constant of 3.99A are fabricated by epitaxially growing FeSe/Nb:SrTiO3/KTaO3 heterostructures, and studied by in situ angle-resolved photoemission spectroscopy. Two elliptical electron pockets ... More
Phonon-enhanced superconductivity at the FeSe/SrTiO3 interfaceOct 19 2017The dream of room temperature superconductors has inspired intense research effort to find routes for enhancing the superconducting transition temperature (Tc). Therefore, single-layer FeSe on a SrTiO3 substrate, with its extraordinarily high Tc amongst ... More
The Type Ia Supernova 1997br in ESO 576-G40Mar 30 1999The peculiar type Ia supernova SN 1997br in ESO 576-G40 was extensively observed at Beijing Astronomical Observatory and Lick Observatory. In this paper, we present and discuss the BVRI photometry and the spectra collected over 3 months, beginning 9 days ... More
The origin of the dead-layer at the La0.67Sr0.33MnO3/SrTiO3 interface and dead-layer reduction via interfacial engineeringJan 21 2013Transition metal oxide hetero-structure has great potential for multifunctional devices. However, the degraded physical properties at interface, known as dead-layer behavior, present a main obstacle for device applications. Here we present the systematic ... More
Highly anisotropic and two-fold symmetric superconducting gap in nematically ordered FeSe$_{0.93}$S$_{0.07}$Mar 16 2016FeSe exhibits a novel ground state in which superconductivity coexists with a nematic order in the absence of any long-range magnetic order. Here we report an angle-resolved photoemission study on the superconducting gap structure in the nematic state ... More
Superconductivity across Lifshitz transition and anomalous insulating state in surface K-dosed (Li0.8Fe0.2OH)FeSeAug 18 2017In the iron-based superconductors, understanding the relation between superconductivity and electronic structure upon doping is crucial for exploring the pairing mechanism. Recently it was found that in iron selenide (FeSe), enhanced superconductivity ... More
Angle-resolved photoemission evidence of s-wave superconducting gap in KxFe2-ySe2 superconductorMay 03 2012Although nodeless superconducting gap has been observed on the large Fermi pockets around the zone corner in KxFe2-ySe2, whether its pairing symmetry is s-wave or nodeless d-wave is still under intense debate. Here we report an isotropic superconducting ... More
Effect of feedback on the control of a two-level dissipative quantum systemJun 10 2008We show that it is possible to modify the stationary state by a feedback control in a two-level dissipative quantum system. Based on the geometric control theory, we also analyze the effect of the feedback on the time-optimal control in the dissipative ... More
Nonequilibrium thermal entanglement in three-qubit $XX$ modelAug 05 2009Oct 21 2009Making use of the master equation and effective Hamiltonian approach, we investigate the steady state entanglement in a three-qubit $XX$ model. Both symmetric and nonsymmetric qubit-qubit couplings are considered. The system (the three qubits) is coupled ... More
A rational design of microwire/CNT hybrid fiber for tunable microwire metacompositesDec 09 2017Metacomposites are a type of engineering composite materials with metamaterial properties. We propose a design of hybrid filler consisting of ferromagnetic microwire and carbon nanotube to enable a tunable microwire metacomposite. There shows a sophisticated ... More
Quantum Brayton cycle with coupled systems as working substanceSep 08 2012Jan 16 2013We explore the quantum version of Brayton cycle with a composite system as the working substance. The actual Brayton cycle consists of two adiabatic and two isobaric processes. Two pressures can be defined in our isobaric process, one corresponds to the ... More
Dispersion, damping, and intensity of spin excitations in the single-layer (Bi,Pb)$_{2}$(Sr,La)$_{2}$CuO$_{6+δ}$ cuprate superconductor familyAug 05 2018Using Cu-$L_3$ edge resonant inelastic x-ray scattering (RIXS) we measured the dispersion and damping of spin excitations (magnons and paramagnons) in the high-$T_\mathrm{c}$ superconductor (Bi,Pb)$_{2}$(Sr,La)$_{2}$CuO$_{6+\delta}$ (Bi2201), for a large ... More
Landau-Zener transition of a two-level system driven by spin chains near their critical pointsApr 26 2007Sep 20 2007The Landau-Zener(LZ) transition of a two-level system coupling to spin chains near their critical points is studied in this paper. Two kinds of spin chains, the Ising spin chain and XY spin chain, are considered. We calculate and analyze the effects of ... More
Thermodynamics with density and temperature dependent particle masses and properties of bulk strange quark matter and strangeletsJun 06 2005Jun 07 2005Thermodynamic formulas for investigating systems with density and/or temperature dependent particle masses are generally derived from the fundamental derivation equality of thermodynamics. Various problems in the previous treatments are discussed and ... More
Oscillatory nonlinear differential magnetoresistance of highly mobile 2D electrons in high Landau levelsJul 21 2009We examine the current-induced magnetoresistance oscillations in high-mobility two-dimensional electron systems using the balance-equation scheme for nonlinear magnetotransort. The reported analytical expressions for differential magnetoresistivity at ... More
Nonlinear theory of fractional microwave-induced magnetoresistance oscillations in a dc-driven two-dimensional electron systemOct 11 2008Mar 12 2009Microwave-induced nonlinear magnetoresistance in a dc-driven two-dimensional electron system is examined using a multi-photon-assisted transport scheme direct controlled by the current. It is shown that near the 2nd subharmonic of the cyclotron resonance, ... More
Band dependent inter-layer $f$-electron hybridization in CeRhIn$_5$Jan 23 2018A key issue in heavy fermion research is how subtle changes in the hybridization between the 4$f$ (5$f$) and conduction electrons can result in fundamentally different ground states. CeRhIn$_5$ stands out as a particularly notable example: replacing Rh ... More
Direct-current control of radiation-induced differential magnetoresistance oscillations in two-dimensional electron systemsJun 21 2007Sep 19 2007Magnetoresistance oscillations in two-dimensional electron systems driven simultaneously by a strong direct current and a microwave irradiation, are analyzed within a unified microscopic scheme treating both excitations on an equal footing. The microwave-induced ... More
Microwave strengths to induce magnetoresistance oscillations in high-mobility 2DES in a photon-assisted impurity scattering modelSep 03 2004It is shown that, although the major feature of the microwave-induced magnetoresistance oscillations in two-dimensional (2D) electron systems is insensitive to the behavior of the elastic scattering in the photon-assisted impurity scattering model [X.L. ... More
Radiation-intensity and temperature dependence of microwave-induced magnetoresistance oscillations in high-mobility two-dimensional electron systemsJul 31 2003We present a detailed theoretical investigation on the radiation induced giant magnetoresistance oscillations recently discovered in high-mobility two-dimensional electron gas. Electron interactions with impurities, transverse and longitudinal acoustic ... More
Time from quantum state complexity and the pace of time flowJan 16 2018Based on the hypothesis that the thermodynamic arrow of time is an emergent phenomenon of quantum state complexity evolution, we further propose that the natural pace of time flow is proportional to the changing rate of quantum state complexity. we then ... More
Direct observation of charge order in underdoped and optimally doped Bi$_{2}$(Sr,La)$_{2}$CuO$_{6+δ}$ by resonant inelastic x-ray scatteringOct 06 2016Charge order in underdoped and optimally doped high-$T_\mathrm{c}$ superconductors Bi$_{2}$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ (Bi2201) is investigated by Cu $L_3$ edge resonant inelastic x-ray scattering (RIXS). We have directly observed charge density ... More
Determination of the mass loss rate and the terminal velocity of stellar winds. I Genetic algorithm for automatic line profile fittingJan 28 2005Terminal wind velocity and mass loss rate are the most fundamental parameters of stellar winds. Unfortunately, their determination calls for high resolution spectroscopy in a range of wavelengths spanning from the ultraviolet to the infrared. For weak ... More
Current-induced magnetoresistance oscillations in two-dimensional electron systemsOct 20 2006Sep 18 2007Electric current-induced magnetoresistance oscillations recently discovered in two-dimensional electron systems are analyzed using a microscopic scheme for nonlinear magnetotransport direct controlled by the current. The magnetoresistance oscillations ... More
Radiation-induced magnetoresistance oscillations in two-dimensional electron systems under bichromatic irradiationMay 22 2006We analyze the magnetoresistance $R_{xx}$ oscillations in high-mobility two-dimensional electron systems induced by the combined driving of two radiation fields of frequency $\omega_1$ and $\omega_2$, based on the balance-equation approach to magnetotransport ... More
Chemical consequences of low star formation rates: stochastically sampling the IMFFeb 08 2008Jul 28 2008When estimating the abundances which result from a given star formation event, it is customary to treat the IMF as a series of weight factors to be applied to the stellar yields, as a function of mass, implicitly assuming one is dealing with an infinite ... More
Observation of a nodal chain with Dirac surface states in TiB2May 12 2018Topological nodal-line semimetals (TNLSMs) are characterized by symmetry-protected band crossings extending along one-dimensional lines in momentum space. The nodal lines exhibit a variety of possible configurations, such as nodal ring, nodal link, nodal ... More
Surface electronic structure and isotropic superconducting gap in (Li$_{0.8}$Fe$_{0.2}$)OHFeSeJun 09 2015Using angle-resolved photoemission spectroscopy (ARPES), we revealed the surface electronic structure and superconducting gap of (Li$_{0.8}$Fe$_{0.2}$)OHFeSe, an intercalated FeSe-derived superconductor without antiferromagnetic phase or Fe-vacancy order ... More
Low temperature electron-phonon resonance in dc-current-biased two-dimensional electron systemsJan 31 2008May 13 2008Effects of resonant acoustic phonon scattering on magnetoresistivity are examined in two-dimensional electron systems at low temperatures by using a balance-equation magnetotransport scheme direct controlled by the current. The experimentally observed ... More
Robust and clean Majorana zero mode in the vortex core of high-temperature superconductor (Li0.84Fe0.16)OHFeSeJul 03 2018Dec 17 2018The Majorana fermion, which is its own anti-particle and obeys non-abelian statistics, plays a critical role in topological quantum computing. It can be realized as a bound state at zero energy, called a Majorana zero mode (MZM), in the vortex core of ... More
Edge states in a two-dimensional honeycomb lattice of massive magnetic skyrmionsSep 30 2018Nov 06 2018We study the collective dynamics of a two-dimensional honeycomb lattice of magnetic skyrmions. By performing large-scale micromagnetic simulations, we find multiple chiral and non-chiral edge modes of skyrmion oscillations in the lattice. The non-chiral ... More
Interplay of Wave Localization and Turbulence in Spin Seebeck EffectApr 14 2018One of the most important discoveries in spintronics is the spin Seebeck effect (SSE) recently observed in both insulating and (semi-)conducting magnets. However, the very existence of the effect in transverse configuration is still a subject of current ... More
Self-guiding of 100 TW Femtosecond Laser Pulses in Centimeter-scale Underdense PlasmaMay 29 2006An experiment for studying laser self-guiding has been carried out for the high power ultrashort pulse laser interaction with an underdense plasma slab. Formation of an extremely long plasma channel and its bending are observed when the laser pulse power ... More
Off-diagonal geometric phase in composite systemsJul 28 2004The effect due to the inter-subsystem coupling on the off-diagonal geometric phase in a composite system is investigated. We analyze the case where the system undergo an adiabatic evolution. Two coupled qubits driven by time-dependent external magnetic ... More
Fundamental mechanism underlying subwavelength optics of metamaterials: Charge oscillation-induced light emission and interferenceMar 20 2009Interactions between light and conducting nanostructures can result in a variety of novel and fascinating phenomena. These properties may have wide applications, but their underlying mechanisms have not been completely understood. From calculations of ... More
Synchronous multi-color laser network with daily sub-femtosecond timing driftOct 26 2017Aug 14 2018Filming atoms in motion with sub-atomic spatiotemporal resolution is one of the distinguished scientific endeavors of our time. Newly emerging X-ray laser facilities are the most likely candidates to enable such a detailed gazing of atoms due to their ... More
Robust Multiple-Range Coherent Quantum State TransferDec 07 2015We propose a multiple-range quantum communication channel to realize coherent two-way quantum state transport with high fidelity. In our scheme, an information carrier (a qubit) and its remote partner are both adiabatically coupled to the same data bus, ... More
Experimental generation of pseudo bound entanglementSep 15 2009We use Nuclear Magnetic Resonance (NMR) to experimentally generate a bound entangled (more precisely: pseudo bound entangled) state, i.e. a quantum state which is non-distillable but nevertheless entangled. Our quantum system consists of three qubits. ... More
Thermodynamics, strange quark matter, and strange starsMar 03 2000Because of the mass density-dependence, an extra term should be added to the expression of pressure. However, it should not appear in that of energy according to both the general ensemble theory and basic thermodynamic principle. We give a detail derivation ... More
In-medium Properties of $Θ^{+}$ as a K$π$N structure in Relativistic Mean Field TheoryJan 26 2005Oct 22 2005The properties of nuclear matter are discussed with the relativistic mean-field theory (RMF).Then, we use two models in studying the in-medium properties of $\Theta^+$: one is the point-like $\Theta^*$ in the usual RMF and the other is a K$\pi$N structure ... More
Fine-to-coarse Knowledge Transfer For Low-Res Image ClassificationMay 21 2016We address the difficult problem of distinguishing fine-grained object categories in low resolution images. Wepropose a simple an effective deep learning approach that transfers fine-grained knowledge gained from high resolution training data to the coarse ... More
The influence of chiral chemical potential, parallel electric and magnetic fields on the critical temperature of QCDAug 30 2016We study the influence of external electric, $E$, and magnetic, $B$, fields parallel to each other, and of a chiral chemical potential, $\mu_5$, on the chiral phase transition of Quantum Chromodynamics. Our theoretical framework is a Nambu-Jona-Lasinio ... More
Transport evidence of robust topological surface state in BiTeCl single crystals, the first strong inversion asymmetric topological insulatorJan 27 2014Three-dimensional (3D) topological insulators (TIs) are new forms of quantum matter that are characterized by their insulating bulk state and exotic metallic surface state, which hosts helical Dirac fermions1-2. Very recently, BiTeCl, one of the polar ... More
A conditional quantum phase gate between two 3-state atomsOct 23 2002We propose a scheme for conditional quantum logic between two 3-state atoms that share a quantum data-bus such as a single mode optical field in cavity QED systems, or a collective vibrational state of trapped ions. Making use of quantum interference, ... More
Entropy and specific heat for open systems in steady statesJan 27 2010The fundamental assumption of statistical mechanics is that the system is equally likely in any of the accessible microstates. Based on this assumption, the Boltzmann distribution is derived and the full theory of statistical thermodynamics can be built. ... More
Crossover from Collective to Incoherent Spin Excitations in Superconducting Cuprates Probed by Detuned Resonant Inelastic X-ray ScatteringAug 02 2017Spin excitations in the overdoped high temperature superconductors Tl$_2$Ba$_2$CuO$_{6+\delta}$ and (Bi,Pb)$_2$(Sr,La)$_{2}$CuO$_{6+\delta}$ were investigated by resonant inelastic x-ray scattering (RIXS) as functions of doping and detuning of the incoming ... More
The Dynamical Invariant of Open Quantum SystemOct 05 2015The dynamical invariant, whose expectation value is constant, is generalized to open quantum system. The evolution equation of dynamical invariant (the dynamical invariant condition) is presented for Markovian dynamics. Different with the dynamical invariant ... More
Loschmidt echo and Berry phase around degeneracies in nonlinear systemsMar 21 2008We study the Loschmidt echo and Berry phase in a nonlinear system transported around a double and triple degeneracy. The nonlinearity of the system makes the Berry phase different from that in linear systems. We propose a witness of nonlinearity for the ... More