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Results for "Z. L. Wang"

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The relationships of solar flares with both sunspot and geomagnetic activityDec 24 2011The relationships between solar flare parameters (total importance, time duration, flare index, and flux) and sunspot activity (Rz) as well as those between geomagnetic activity (aa index) and the flare parameters can be well described by an integral ... More
Asymmetric nonsingular bounce from a dynamic scalar fieldJun 11 2019We present a dynamical model for an asymmetric nonsingular bounce with a post-bounce change of the effective equation-of-state parameter. Specifically, we consider a scalar-field model with a time-reversal-noninvariant effective potential.
Nonsingular bounce cosmology from general relativityApr 22 2019Apr 29 2019We investigate a particular classical nonsingular bounce cosmology, which results from general relativity if we allow for degenerate metrics. The simplest model has a constant equation of state and we calculate the modified Hubble diagram for both the ... More
Exceptional point induced lasing dynamics in a non-Hermitian systemAug 22 2018Non-Hermitian systems exhibit many peculiar dynamic behaviors which never showed up in Hermitian systems. The existence of spectral singularity (SS) for a non-Hermitian scattering center provides a lasing mechanism in the context of quantum mechanics. ... More
Energy spectra of three electrons in Si/SiGe single and vertically coupled double quantum dotsNov 03 2011We study three-electron energy spectra in Si/SiGe single and vertically coupled double quantum dots where all the relevant effects, such as, the Zeeman splitting, spin-orbit coupling, valley coupling and electron-electron Coulomb interaction are explicitly ... More
PTF11agg as the First Evidence for Reverse Shock Emission from a Postmerger Millisecond MagnetarAug 06 2013Aug 10 2013Based on the stiff equations of state of neutron stars (NS) and the discovery of high-mass NSs, a NS-NS merger will leave behind, with high probabilities, a rapidly rotating massive magnetar. The central magnetar will dissipate its rotational energy to ... More
A meshless method for compressible flows with the HLLC Riemann solverFeb 11 2014The HLLC Riemann solver, which resolves both the shock waves and contact discontinuities, is popular to the computational fluid dynamics community studying compressible flow problems with mesh methods. Although it was reported to be used in meshless methods, ... More
Semi-localization transition driven by a single asymmetrical tunnelingSep 06 2019A local impurity usually only strongly affects few single-particle energy levels, thus cannot induce a quantum phase transition (QPT), or any macroscopic quantum phenomena in a many-body system within the Hermitian regime. However, it may happen for a ... More
Predicting the solar maximum with the rising rateDec 24 2011The growth rate of solar activity in the early phase of a solar cycle has been known to be well correlated with the subsequent amplitude (solar maximum). It provides very useful information for a new solar cycle as its variation reflects the temporal ... More
Structure and decay constant of the ρmeson with Bethe-Salpeter equationJul 12 2006Jul 12 2007In this article, we study the structure of the \rho meson in the framework of the coupled rainbow Schwinger-Dyson equation and ladder Bethe-Salpeter equation with a confining effective potential. The u and d quark propagators get significantly modified, ... More
Analysis of the vertices $D^*D_sK$, $D^*_sDK$,$D_0D_sK$ and $D_{s0}DK$ with the light-cone QCD sum rulesMay 31 2006Jun 29 2006In this article, we analyze the vertices $D^*D_sK$, $D^*_sDK$, $D_0D_sK$ and $D_{s0}DK$ within the framework of the light-cone QCD sum rules approach in an unified way. The strong coupling constants $G_{D^*D_sK}$ and $G_{D^*_sDK}$ are important parameters ... More
Analysis of the vector form factors $f^+_{Kπ}(Q^2)$ and $f^-_{Kπ}(Q^2)$ with light-cone QCD sum rulesAug 15 2006Feb 09 2007In this article, we calculate the vector form factors $f^+_{K\pi}(Q^2)$ and $f^-_{K\pi}(Q^2)$ within the framework of the light-cone QCD sum rules approach. The numerical values of the $f^+_{K\pi}(Q^2)$ are compatible with the existing theoretical calculations, ... More
Does a low solar cycle minimum hint at a weak upcoming cycle?Aug 14 2010The maximum amplitude (Rm) of a solar cycle, in the term of mean sunspot numbers, is well-known to be positively correlated with the preceding minimum (Rmin). So far as the long term trend is concerned, a low level of Rmin tends to be followed by a weak ... More
Bilinear forms on Green rings of finite dimensional Hopf algebrasDec 17 2015Apr 01 2016In this paper, we study the Green ring and the stable Green ring of a Hopf algebra $H$ by means of bilinear forms. We show that the Green ring of a Hopf algebra of finite representation type is a Frobenius algebra over $\mathbb{Z}$ with a dual basis associated ... More
Nonsingular bounce cosmology from general relativityApr 22 2019We investigate a particular classical nonsingular bounce cosmology, which results from general relativity if we allow for degenerate metrics. The simplest model has a constant equation of state and we calculate the modified Hubble diagram for both the ... More
Asymmetric nonsingular bounce from a dynamic scalar fieldJun 11 2019Aug 15 2019We present a dynamical model for a time-asymmetric nonsingular bounce with a post-bounce change of the effective equation-of-state parameter. Specifically, we consider a scalar-field model with a time-reversal-noninvariant effective potential.
Dynamical symmetry breaking, confinement with flat-bottom potentialApr 14 2002In this article, we calculate the dressed quark propagator with the flat bottom potential in the framework of the rain-bow Schwinger-Dyson equation. Then based on the nonperturbative dressed quark propagator, we calculate the $\pi$ decay constant and ... More
Structure of the $D_{s0}(2317)$ and the strong coupling constant $g_{D_{s0} D K}$ with the light-cone QCD sum rulesMar 01 2006May 03 2006In this article, we take the point of view that the charmed scalar meson $D_{s0}(2317)$ is the conventional $c\bar{s}$ meson and calculate the strong coupling constant $g_{D_{s0} D K}$ within the framework of the light-cone QCD sum rules approach. The ... More
Biharmonic maps into Sol and Nil spacesDec 13 2006In this paper, we study biharmonic maps into Sol and Nil spaces, two model spaces of Thurston's 3-dimensional geometries. We characterize non-geodesic biharmonic curves in Sol space and prove that there exists no non-geodesic biharmonic helix in Sol space. ... More
Analysis of the strong coupling constant $G_{D_{s}^{*}D_{s}φ}$ and the decay width of $D_{s}^{*}\rightarrow D_{s}γ$ with QCD sum rulesJan 18 2015In this article, we calculate the form factors and the coupling constant of the vertex $D_{s}^{*}D_{s}\phi$ using the three-point QCD sum rules. We consider the contributions of the vacuum condensates up to dimension $7$ in the operator product expansion(OPE). ... More
The prediction method of similar cyclesOct 28 2011The concept of degree of similarity ({\eta}) is proposed to quantitatively describe the similarity of a parameter (e.g. the maximum amplitude Rmax) of a solar cycle relative to a referenced one, and the prediction method of similar cycles is further developed. ... More
Nonsingular bouncing cosmology from general relativityApr 22 2019Jun 27 2019We investigate a particular classical nonsingular bouncing cosmology, which results from general relativity if we allow for degenerate metrics. The simplest model has a constant equation of state and we calculate the modified Hubble diagram for both the ... More
Asymmetric nonsingular bounce from a dynamic scalar fieldJun 11 2019Jun 17 2019We present a dynamical model for a time-asymmetric nonsingular bounce with a post-bounce change of the effective equation-of-state parameter. Specifically, we consider a scalar-field model with a time-reversal-noninvariant effective potential.
Nonsingular bouncing cosmology from general relativityApr 22 2019Aug 26 2019We investigate a particular type of classical nonsingular bouncing cosmology, which results from general relativity if we allow for degenerate metrics. The simplest model has a matter content with a constant equation-of-state parameter and we calculate ... More
An Optical Clock Based on Coherent Population Trapping of Alkaline-earth IonsApr 02 2009An ultra-stable optical clock based on coherent population trapping effect of alkaline-earth ions, such as Ca$^+$, Sr$^+$, Ba$^+$, is analyzed here. The proposed transitions use the odd isotopes, so that the frequency shift is insensitive to the applied ... More
The correlation between isotropic energy and duration of gamma-ray burstsNov 30 2018In this paper, we study the correlation between isotropic energy and duration of gamma-ray bursts (GRBs) for the first time. The correlation is found to be $T_d \propto {E_{iso}}^{0.34\pm 0.03}$ from the {\em Swift} GRB sample. After comparing with solar ... More
Non-Hermitian phase transition and eigenstate localization induced by asymmetric couplingJun 03 2019We investigate a uniformly coupled non-Hermitian system with asymmetric coupling amplitude. The asymmetric coupling equals to a symmetric coupling threaded by an imaginary gauge field. In a closed configuration, the imaginary gauge field leads to an imaginary ... More
Su-Schrieffer-Heeger chain with one pair of PT-symmetric defectsSep 29 2017The topologically nontrivial edge states induce PT transition in Su-Schrieffer-Heeger (SSH) chain with one pair of gain and loss at boundaries. In this study, we investigated a pair of PT-symmetric defects located inside the SSH chain, in particular, ... More
Calculation of the quark condensate through Schwinger-Dyson equationDec 22 2002In this letter, we clarify the algebra expression for calculating the quark condensate based on the non-perturbative quark propagator calculated through Schwinger-Dyson equation. The quark condensates, which characterize the low energy QCD vacuum, should ... More
Tunable one-dimensional microwave emissions from cyclic-transition three-level atomsOct 29 2010By strongly driving a cyclic-transition three-level artificial atom, demonstrated by such as a flux-based superconducting circuit, we show that coherent microwave signals can be excited along a coupled one-dimensional transmission line. Typically, the ... More
The Energy Sources of Superluminous SupernovaeFeb 21 2019Supernovae (SNe) are the most brilliant optical stellar-class explosions. Over the past two decades, several optical transient survey projects discovered more than $\sim 100$ so-called superluminous supernovae (SLSNe) whose peak luminosities and radiated ... More
Reverse Shock Emission Driven By Post-Merger Millisecond Magnetar Winds: Effects of the Magnetization ParameterApr 11 2016The study of short-duration gamma-ray bursts provides growing evidence that a good fraction of double neutron star mergers lead to the formation of stable millisecond magnetars. The launch of Poynting flux by the millisecond magnetars could leave distinct ... More
Non-adiabatic effects of superconductor silane under high pressureAug 17 2010Investigations of non-adiabatic effects by including vertex corrections in the standard Eliashberg theory show that high phonon frequency is unfavorable to superconductivity in regime of strong vertex correction. This means that it is hard to find high-transition-temperature ... More
Anisotropic magnetoresistance in topological insulator Bi1.5Sb0.5Te1.8Se1.2/CoFe heterostructuresSep 07 2011Dec 20 2012Topological insulator is composed of an insulating bulk state and time reversal symmetry protected two-dimensional surface states. One of the characteristics of the surface states is the locking between electron momentum and spin orientation. Here, we ... More
Distribution of doped Mn at the Σ3 (112) grain boundary in GeMay 21 2010Using first-principles density functional theory method, we have investigated the distribution and magnetism of doped Mn atoms in the vicinity of the 3 (112) grain boundary in Ge. We find that at low concentration, the substitutional sites are energetically ... More
Ground state mass spectrum for scalar diquarks with Bethe-Salpeter equationJun 04 2005Jun 10 2006In this article, we study the structures of the pseudoscalar mesons $\pi$, $K$ and the scalar diquarks $U^a$, $D^a$, $S^a$ in the framework of the coupled rainbow Schwinger-Dyson equation and ladder Bethe-Salpeter equation with the confining effective ... More
Semimetal-semiconductor transition and giant linear magnetoresistances in three-dimensional Dirac semimetal Bi0.96Sb0.04 single crystalsSep 08 2015Three-dimensional (3D) Dirac semimetals are new quantum materials and can be viewed as 3D analogues of graphene. Many fascinating electronic properties have been proposed and realized in 3D Dirac semimetals, which demonstrates their potential applications ... More
Rebound-through transition of bright-bright solitons collision in two species condensates with repulsive interspecies interactionsFeb 03 2012We study the dynamical properties of bright-bright solitons in two species Bose-Einstein condensates with the repulsive interspecies interactions under the external harmonic potentials by using a variational approach combined with numerical simulation. ... More
Exact solutions for a type of electron pairing model with spin-orbit interactions and Zeeman couplingJan 19 2011Mar 25 2011A type of electron pairing model with spin-orbit interactions or Zeeman coupling is solved exactly in the framework of Richardson ansatz. Based on the exact solutions for the case with spin-orbit interactions, it is shown rigorously that the pairing order ... More
Growth model investigation of Vanadium-Benzene PolymerFeb 23 2010Electronic and magnetic properties of VnBzn+1 sandwich clusters are investigated using density functional theory. Growth model is applied to investigate the property change of Vanadium-Benzene sandwich clusters. Our results show that, for n<8, all V ions ... More
An attractor dynamics in a non-Hermitian two-level systemOct 21 2017Exceptional point in non-Hermitian system possesses fascinating properties. We present an exactly solvable attractor dynamics for the first time from a two-level time dependent non-Hermitian Hamiltonian. It allows a way to evolve to the coalescence state ... More
Energy spectra of three electrons in SiGe/Si/SiGe laterally coupled triple quantum dotsJun 17 2013We investigate the energy spectra of three electrons in SiGe/Si/SiGe equilateral triangular and symmetric linear triple quantum dots in the presence of magnetic (in either Faraday or Voigt configuration) and electric fields with single valley approximation ... More
Controlled quantum teleportation and secure direct communicationMar 22 2004We present a controlled quantum teleportation protocol. In the protocol, quantum information of an unknown state of a 2-level particle is faithfully transmitted from a sender (Alice) to a remote receiver (Bob) via an initially shared triplet of entangled ... More
Wave emission and absorption at spectral singularitiesNov 02 2016We studied the critical dynamics of spectral singularities. The system investigated is a coupled resonator array with a side-coupled loss (gain) resonator. For a gain resonator, the system acts as a wave emitter at spectral singularities. The reflection ... More
Simple harmonic oscillation in non-Hermitian SSH chain at exceptional pointApr 23 2018The balance of gain and loss in an open system may maintain certain Hermitian dynamical behaviors, which can be hardly observed in a popular Hermitian system. In this paper, we systematically study a 1D PT -symmetry non-Hermitian SSH model with open boundary ... More
Wavelet Perspective of a Disoriented Chiral CondensateJul 02 1996Oct 02 1996The possible chiral phase transition in high energy heavy-ion collisions may lead to the formation of a disoriented chiral condensate (DCC). However, the existence of many uncorrelated small domains in the rather large interaction volume and the huge ... More
Infrared properties of $θ$-type ET charge-transfer salts: $θ$-ET$_2$CsZn(SCN)$_4$ vs $θ$-ET$_2$RbZn(SCN)$_4$Nov 12 2002We performed polarized far-infrared reflectance measurements at different temperatures on $\theta$-ET$_2$RbZn(SCN)$_4$ and $\theta$-ET$_2$CsZn(SCN)$_4$, two typical charge-transfer salts in a series of isostructural $\theta$-ET$_2$MM'(SCN)$_4$. The measurements ... More
Electronic States in Two-Dimensional Triangular Cobalt Oxides: Role of Electronic CorrelationJul 23 2003Jul 24 2003We obtain the electronic states and structures of two-dimensional cobalt oxides, Na$_{x}$CoO$_{2}$ (x=0, 0.35, 0.5 and 0.75) by utilizing the full-potential linear muffin-tin orbitals (FP-LMTO) methods, from which some essential electronic interaction ... More
The Unified Hydrodynamics and the Pseudorapidity Distributions in Heavy Ion Collisions at BNL-RHIC and CERN-LHC EnergiesSep 29 2015The charged particles produced in nucleus-nucleus collisions are divided into two parts. One is from the hot and dense matter created in collisions. The other is from leading particles. The hot and dense matter is assumed to expand according to unified ... More
Parallel dynamics between non-Hermitian and Hermitian systemsApr 13 2017We study the connection between a family of non-Hermitian Hamiltonians H and Hermitian ones H based on exact solutions. In general, for a dynamic process in a non-Hermitian system H, there always exists a parallel dynamic process governed by the corresponding ... More
Odd-even effect of quantum discord and quantum phase transitions in the S=1/2 spin ladder with ring exchangeApr 27 2013The singularity of quantum correlations, such as quantum entanglement(QE) and quantum discord(QD), has been widely regarded as a valuable indicator for quantum phase transition(QPT) in low-dimensional quantum systems. In this paper, for a spin ladder ... More
Viscous potential flow analysis of peripheral heavy ion collisionsFeb 07 2013The conditions for the development of a Kelvin-Helmholtz Instability (KHI) for the Quark-gluon Plasma (QGP) flow in a peripheral heavy-ion collision is investigated. The projectile and target side particles are separated by an energetically motivated ... More
Impact of Low-Energy Response to Nuclear Recoils in Dark Matter DetectorsDec 02 2015We report an absolute energy response function to electronic and nuclear recoils for germanium and liquid xenon detectors. As a result, we show that the detection energy threshold of nuclear recoils for a dual-phase xenon detector can be $\sim$ 6.8 keV ... More
Implementation of quantum gates based on geometric phases accumulated in the eigenstates of periodic invariant operatorsOct 24 2006We propose a new strategy to physically implement a universal set of quantum gates based on geometric phases accumulated in the nondegenerate eigenstates of a designated invariant operator in a periodic physical system. The system is driven to evolve ... More
Impact of Low-Energy Response to Nuclear Recoils in Dark Matter DetectorsDec 02 2015Mar 28 2017We report an absolute energy response function to electronic and nuclear recoils for germanium and liquid xenon detectors. As a result, we show that the detection energy threshold of nuclear recoils for a dual-phase xenon detector can be a few keV for ... More
Average Energy Expended Per e-h Pair and Energy Scale Function for Germanium-Based Dark Matter ExperimentsFeb 25 2016Dec 30 2016We report a new result of the temperature-dependent average energy expended per electron-hole (e-h) pair, $\varepsilon$, for germanium detectors. Applying energy partition mechanism in ionization for a given energy deposition, the Fano factor and the ... More
Multi-mode effects in cavity QED based on a one-dimensional cavity arrayApr 23 2014Sep 28 2014We present a microscopic mo del of cavity quantum electro dynamics based on a one-dimensional coupled cavity array (1D CCA), where a sup er cavity (SC) is comp osed by a segment of the 1D CCA with relatively smaller couplings with the outsides. The single-photon ... More
A new approach for calculating the Nambu-Gorkov propagator in color superconductivity theoryAug 30 2005Sep 03 2005In this article, we propose a new approach to calculate the Nambu-Gorkov propagator intuitively with some linear algebra techniques in presence of the scalar diquark condensates. With the help of energy projective operators, we can obtain relatively simple ... More
Pumping vortex into a Bose-Einstein condensate of heteronuclear moleculesFeb 09 2009Heteronuclear molecules attract wide attention due to their permanent electric dipole moments. Analogous to atoms with magnetic dipoles, the existence of nonzero electric dipoles significantly enhance possibilities and mechanisms for control and design ... More
The evolution-dominated hydrodynamic model and the pseudorapidity distributions in high energy physicsJan 04 2014By taking into account the effects of leading particles, we discuss the pseudorapidity distributions of the charged particles produced in high energy heavy ion collisions in the context of evolution-dominated hydrodynamic model. The leading particles ... More
Temperature Dependence of the Average Energy Expended Per e-h Pair for Germanium-Based Dark Matter ExperimentsFeb 25 2016May 25 2016We report a new method to determine the temperature-dependent average energy expended per electron-hole (e-h) pair, $\varepsilon$, for germanium detectors. As a result, the Fano factor and $\varepsilon$ can be determined separately. Subsequently, we illustrate ... More
Quantum spin mixing in a binary mixture of spin-1 atomic condensatesJan 27 2012We study quantum spin mixing in a binary mixture of spin-1 condensates including coherent interspecies mixing process, using the familiar spinor condensates of $^{87}$Rb and $^{23}$Na atoms in the ground lower hyperfine F=1 manifolds as prototype examples. ... More
Optical Modulation in the X-Ray Binary 4U 1543-624 RevisitedJul 08 2014Sep 06 2015The X-ray binary 4U 1543$-$624 has been provisionally identified as an ultracompact system with an orbital period of $\simeq$18~min. We have carried out time-resolved optical imaging of the binary to verify the ultra-short orbital period. Using 140\,min ... More
Optical and Raman spectroscopy studies on Fe-based superconductorsFeb 03 2009A brief review of optical and Raman studies on the Fe-based superconductors is given, with special emphasis on the competing phenomenon in this system. Optical investigations on ReFeAsO (Re=rare-earth element) and AFe$_2$As$_2$ (A=alkaline-earth metal) ... More
Probing cosmic acceleration by strong gravitational lensing systemsJan 26 2019Recently, some divergent conclusions about cosmic acceleration were obtained using type Ia supernovae (SNe Ia), with opposite assumptions on the intrinsic luminosity evolution. In this paper, we use strong gravitational lensing systems to probe the cosmic ... More
Visualizing Topology of Real-Energy Gapless Phase Arising from Exceptional PointMay 17 2019The discovery of novel topological phase advances our knowledge of nature and stimulates the development of applications. In non-Hermitian topological systems, the topology of band touching exceptional points is very important. Here we propose a real-energy ... More
Temperature and number evolution of cold cesium atoms inside a wall-coated glass cellMay 25 2015Sep 08 2015We report an experimental study on the temperature and number evolution of cold cesium atoms diffusively cooled inside a wall-coated glass cell by measuring the absorption profile of the 62S1/2 (F=4)-62P3/2 (F'=5) transition line with a weak probe laser ... More
The Most Luminous Supernova ASASSN-15lh: Signature of a Newborn Rapidly-Rotating Strange Quark StarAug 31 2015Dec 23 2015In this paper we show that the most luminous supernova discovered very recently, ASASSN-15lh, could have been powered by a newborn ultra-strongly-magnetized pulsar, which initially rotates near the Kepler limit. We find that if this pulsar is a neutron ... More
A Triple-Energy-Source Model for Superluminous Supernova iPTF13eheSep 18 2015Jul 08 2016Almost all superluminous supernovae (SLSNe) whose peak magnitudes are $\lesssim -21$ mag can be explained by the $^{56}$Ni-powered model, magnetar-powered (highly magnetized pulsar) model or ejecta-circumstellar medium (CSM) interaction model. Recently, ... More
Controlling Fusion of Majorana Fermions in one-dimensional systems by Zeeman FieldApr 17 2013May 03 2013We propose to realize Majorana fermions (MFs) on an edge of a two-dimensional topological insulator in the proximity with s-wave superconductors and in the presence of transverse exchange field h. It is shown that there appear a pair of MFs localized ... More
Two dimensional scaling of resistance in flux flow region in $Tl_2Ba_2CaCu_2O_8$ thin filmsDec 03 2004The resistance of $Tl_2Ba_2CaCu_2O_8$ thin films has been measured when the angle between the applied fields and $ab$-plane of the film is changed continuously at various temperatures. Under various magnetic fields, the resistance can be well scaled in ... More
Critical exponents of the two-layer Ising modelJan 14 2001The symmetric two-layer Ising model (TLIM) is studied by the corner transfer matrix renormalisation group method. The critical points and critical exponents are calculated. It is found that the TLIM belongs to the same universality class as the Ising ... More
Linear magneto-resistance versus weak antilocalization effects in Bi$_2$Te$_3$ filmsJan 26 2015Dec 29 2015In chalcogenide topological insulator materials, two types of magneto-resistance (MR) effects are widely discussed: a positive MR dip around zero magnetic field associated with the weak antilocalization (WAL) effect and a linear MR effect which generally ... More
Magnetic excitations in quasi-one dimensional helimagnets: Magnon decays and in uence of the inter-chain interactionsOct 20 2016We present a comprehensive study of the magnetic properties of the long-range ordered quasi-one dimensional $J_{1}$-$J_{2}$ systems with a newly developed torque equilibrium spin-wave expansion approach, which can describe the spin Casimir and magnon ... More
$\mathcal{PT}$ symmetric phase transition and single-photon transmission in an optical trimmer systemDec 21 2016Feb 09 2017The parity-time ($\mathcal{PT}$) symmetric structures have exhibited potential applications in developing various robust quantum devices. In an optical trimmer with balanced loss and gain, we analytically study the $\mathcal{PT}$ symmetric phase transition ... More
Effects of Si solute on the glass formation and atomic structure of Pd liquidOct 08 2018Molecular dynamics simulations were performed to study the effects of Si solute on the glass formation and crystallization of Pd liquid. Pure Pd sample prepared by quenching process with cooling rate of $10^{13}$ K/s can be in an amorphous state but the ... 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
Effects of the Dzyaloshinskii-Moriya interaction on low energy magnetic excitations in copper benzoateDec 17 2002May 25 2003We have investigated the physical effects of the Dzyaloshinskii-Moriya (DM) interaction in copper benzoate. In the low field limit, the spin gap is found to vary as $H^{2/3}\ln ^{1/6}(J/\mu_BH_s)$ ($H_s$: an effective staggered field induced by the external ... More
NMR evidence for magnetic field confinement of quantum spinons in a weakly coupled $S=$1/2 spin chainDec 15 2018We report our NMR study of the spin excitations in the quasi-one dimensional (1D) $S=1/2$ quantum magnet CH$_3$NH$_3$Cu(HCOO)$_3$ lying in the 1D-3D dimensional crossover regime. Above $T_N$, the spinon excitation is observed from the constant $1/T_1$ ... More
Insight into dielectric response of ferroelectric relaxors by statistical modelingNov 24 2016Dec 16 2016Ferroelectric relaxors are complex materials with distinct properties. The understanding of their dielectric susceptibility, which strongly depends on both temperature and probing frequency, have interested researchers for many years. Here we report a ... More
Magnetic excitations in quasi-one dimensional helimagnets: Magnon decays and in uence of the inter-chain interactionsOct 20 2016Oct 21 2016We present a comprehensive study of the magnetic properties of the long-range ordered quasi-one dimensional $J_{1}$-$J_{2}$ systems with a newly developed torque equilibrium spin-wave expansion approach, which can describe the spin Casimir and magnon ... More
Spin Casimir Effect in Non-collinear Quantum AntiferromagnetsJun 17 2015Dec 10 2015The Casimir effect is a general phenomenon in physics, which arises when the vacuum fluctuation of an arbitrary field is modified by static or slowly varying boundary. However, its spin version is rarely addressed, mainly due to the fact that a macroscopic ... More
Comment on novel public key encryption technique based on multiple chaotic systemsOct 10 2005Recently, a novel public key edcryption technique based on multiple chaotic systems has been proposed. The scheme employs m-chaotic systmes and a set of linear functions for key exchange over an insecure channel. The security of the proposed algorithm ... More
Enhancing Transport Efficiency by Hybrid Routing StrategyApr 15 2012Traffic is essential for many dynamic processes on real networks, such as internet and urban traffic systems. The transport efficiency of the traffic system can be improved by taking full advantage of the resources in the system. In this paper, we propose ... More
The mode switching of PSR B2020+28May 21 2016This paper reports on polarimetric radiation properties based on the switching modes of normal PSR B2020+28 by analysing the data acquired from the Nanshan 25-m radio telescope at 1556 MHz. With nearly 8 hours quasi-continuous observation, the data presented ... More
Effects of tensor interaction on pseudospin energy splitting and shell correctionNov 02 2011In the framework of a Skyrme-Hartree-Fock approach combined with BCS method, the role of the tensor force on the pseudospin energy splitting for tin isotope chain is investigated. The tensor force turns out to obviously affect the pseudospin energy splitting ... More
Optical properties of boron-doped diamondAug 23 2005Nov 24 2005We report optical reflectivity study on pure and boron-doped diamond films grown by a hot-filament chemical vapor deposition method. The study reveals the formation of an impurity band close to the top of the valence band upon boron-doping. A schematic ... More
Magnetism study on a triangular lattice antiferromagnet Cu$_2$(OH)$_3$BrApr 08 2019Magnetism of Cu$_2$(OH)$_3$Br single crystals based on a triangular lattice is studied by means of magnetic susceptibility, pulsed-field magnetization, and specific heat measurements. There are two inequivalent Cu$^{2+}$ sites in an asymmetric unit. Both ... More
Evolution of superhigh magnetic fields of magnetarsDec 10 2013In this paper, we consider the effect of Landau levels on the decay of superhigh magnetic fields of magnetars. Applying ${}^3P_2$ anisotropic neutron superfluid theory yield a second-order differential equation for a superhigh magnetic field $B$ and its ... More
Tc map and superconductivity of simple metals at high pressureAug 17 2010We calculate Tc map in region of weak electron-phonon coupling based on simple phonon spectrum. By using linear-response method and density functional theory, we calculate phonon spectra and Eliashberg functions of simple metals under pressure. Based ... More
Radiation fields by intermediate-age stellar populations with binaries as ionizing sources of H II regionsOct 24 2014Radiation fields emitted by O, B-type stars or young stellar populations (SPs) are generally considered as significant central ionizing sources (CISs) of classic H II regions. In our previous studies, we show that the inclusion of binary interactions ... More
Energy of Alfven waves generated during magnetic reconnectionJun 10 2015A new method for the determination of the Alfven wave energy generated during magnetic reconnection is introduced and used to analyze the results from two-dimensional MHD simulations. It is found that the regions with strong Alfven wave perturbations ... More
Evidence for the band broadening across the ferromagnetic transition in Cr$_{1/3}$NbSe$_2$Aug 05 2008The electronic structure of Cr$_{1/3}$NbSe$_2$ is studied via optical spectroscopy. We observe two low-energy interband transitions in the paramagnetic phase, which split into four peaks as the compound enters the ferromagnetic state. The band structure ... More
Photon statistics and dynamics of nanolasers subject to intensity feedbackAug 05 2019Using a fully stochastic numerical scheme, we investigate the behaviour of a nanolaser in the low-coherence regime at the transition between spontaneous emission and lasing under the influence of intensity feedback. Studying the input-output curves as ... More
Superlattices of Bi2Se3/In2Se3: Growth Characteristics and Structural PropertiesJun 03 2011Superlattices (SLs) consisted of alternating Bi2Se3 and In2Se3 layers are grown on Si(111) by molecular-beam epitaxy. Bi2Se3, a three-dimensional topological insulator (TI), showed good chemical and structural compatibility with In2Se3, a normal band ... More
Search for charmonium and charmonium-like states in Υ(2S) radiative decaysAug 23 2011Using a sample of 158 million \Upsilon(2S) events collected with the Belle detector, charmonium and charmonium-like states with even charge parity are searched for in \Upsilon(2S) radiative decays. No significant \chi_{cJ} or \eta_c signal is observed ... More
Superluminous Supernovae Powered by Magnetars: Late-time Light Curves and Hard Emission LeakageNov 19 2014Recently, researches performed by two groups have revealed that the magnetar spin-down energy injection model with full energy trapping can explain the early-time light curves of SN 2010gx, SN 2013dg, LSQ12dlf, SSS120810 and CSS121015, but fails to fit ... More
Insulator-metal transition in deep Sr-vacant spin-orbit Mott insulator Sr2IrO4Oct 30 2016Sr2IrO4 exhibits a novel insulating state assisted by spin-orbit interactions. A series of polycrystalline samples of Sr2-xIrO4 have been synthesized. It is found that deep Sr-vacancies of Sr2-xIrO4 greatly reduce the rotation of IrO6 octahedral, and ... More
A connection between the structural alpha-relaxation and the beta-relaxation found in bulk metallic glass-formersMar 29 2013New metallic glasses containing La or Ce have been introduced that have dynamic properties bordering on extremes of conventional metallic glasses. This provides opportunity to test trends or correlations established before in molecular and polymeric glass-formers ... More
Scaling Behavior of Anomalous Hall Effect and Longitudinal Nonlinear Response in High-Tc SuperconductorsJul 03 2001Based on existing theoretical model and by considering our longitudinal nonlinear response function, we derive a nonliear equation in which the mixed state Hall resistivity can be expressed as an analytical function of magnetic field, temperature and ... More