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Results for "X. Holzapfel"

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Set-up for multi coincidence experiments of EUV to VIS photons and charged particles -- the solid angle maximization approachJun 11 2019The coincident detection of particles is a powerful method in experimental physics, enabling the investigation of a variety of projectile-target interactions. The vast majority of coincidence experiments is performed with charged particles, as they can ... More
Analyzing data from DASIDec 20 1999We present an optimized layout of horn positions for the Degree Angular Scale Interferometer (DASI), which provides good coverage of the u-v plane and 3-fold symmetry. We investigate how an optimal subspace filtering analysis of a single pointing of DASI ... More
Novel method to study strain effect of thin films using a piezoelectric-based device and a flexible metallic substrateJan 06 2019For applying tensile or compressive uniaxial strain to functional thin films, we propose a novel approach in combining a piezoelectric-based device and a technical metallic substrate used widely in the 2nd generation coated conductors (i.e. superconducting ... More
Quantum logic gates and maximally entangled states in microtrapsApr 05 2002Apr 08 2002This paper has been withdrawn because the first author submitted the paper without previously consulting the rest of the authors.
Resistivity in Co-doped Ba-122: comparison of thin films and single crystalsMar 04 2014May 16 2014The temperature dependence of the resistivity of epitaxial Ba(Fe_(1-x)Co_x)2As2 thin films (with nominal doping x = 0.08, 0.10 and 0.15) has been analyzed and compared with analogous measurements on single crystals taken from literature. The rho(T) of ... More
Anatomy of the quantum melting of the two dimensional Wigner crystalSep 16 2005The Fermi liquid-Wigner crystal transition in a two dimensional electronic system is revisited with a focus on the nature of the fixed node approximation done in quantum Monte Carlo calculations. Recently, we proposed (Phys. Rev. Lett. 94, 046801 (2005)) ... More
Quark Spin and Orbital Angular Momentum in the BaryonOct 29 1999Aug 11 2000The spin and orbital angular momentum carried by different quark flavors in the nucleon are calculated in the SU(3) chiral quark model with symmetry-breaking. The model is extended to all octet and decuplet baryons. In this model, the reduction of the ... More
New Relations and Constraints on Quark Spin-flavor Contents in Symmetry-breaking Chiral Quark ModelDec 11 1997New relations between the quark spin-flavor contents of the nucleon and axial weak coupling constants are obtained in the chiral quark model with both SU(3) and U(1)-breaking effects. Using the nonsinglet spin combinations, $\Delta_3$ and $\Delta_8$, ... More
Probabilistic distributions of $M/L$ values for ultra-faint dwarf spheroidal galaxies: stochastic samplings of the IMFNov 02 2011As the total mass of stellar populations of fixed IMF, age and metallicity tends to infinity, resulting intrinsic $M/L$ values quickly converge to fixed numbers associated to the particulars of the stars in question. When going to very small stellar populations, ... More
Finite temperature Drude weight of the one dimensional spin 1/2 Heisenberg model}Nov 02 1998Using the Bethe ansatz method, the zero frequency contribution (Drude weight) to the spin current correlations is analyzed for the easy plane antiferromagnetic Heisenberg model. The Drude weight is a monotonically decreasing function of temperature for ... More
Classical and quantum constraints in spin physicsJan 10 2008Constraints on spin observables coming from discrete symmetries such as P, C, T and identical particles may be divided in two types: 1) classical ones, which insure the invariance of the cross sections under the symmetry operation; 2) non-classical ones, ... More
Proposals for measuring transversity distributions in deep inelastic electron scattering and a model for E-704 asymmetriesOct 20 1993We present the principles of the measurement of the quark transversity distributions in semi-inclusive deep inelastic electron scattering, which form the basis of HELP and one of the ELFE proposals. A string model for Collins-type asymmetry in polarized ... More
Precision Measurement of the Neutron Spin Asymmetry $A_1^n$ and Spin-Flavor Decomposition in the Valence Quark RegionAug 13 2003Jan 07 2004We have measured the neutron spin asymmetry $A_1^n$ with high precision at three kinematics in the deep inelastic region at $x=0.33$, 0.47 and 0.60, and $Q^2=2.7$, 3.5 and 4.8 (GeV/c)$^2$, respectively. Our results unambiguously show, for the first time, ... 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
Effective Hamiltonian Approach to the Master EquationAug 22 2000A method of exactly solving the master equation is presented in this letter. The explicit form of the solution is determined by the time evolution of a composite system including an auxiliary system and the open system in question. The effective Hamiltonian ... 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
Cosmology from Cosmic Microwave Background fluctuations with PlanckJan 18 2007We present the main scientific goals and characteristics of the ESA Planck satellite mission, as well as the main features of the survey strategy and simulated performance in terms of measuring the temperature and polarization of the Cosmic Microwave ... More
W-Infinity and String TheoryFeb 20 1992Feb 23 1992We review some recent developments in the theory of $W_\infty$. We comment on its relevance to lower-dimensional string theory.
Deeply virtual Compton scattering and prompt photon production at ZEUS and H1 experimentsOct 27 2005Recent results on prompt photon production and Deeply Virtual Compton Scattering (DVCS) from ZEUS and H1 experiments are presented.
Theoretical lower limits on sizes of ultra faint dwarf galaxies from dynamical frictionMay 16 2016Jul 26 2016Dwarf spheroidal galaxies are the smallest known stellar systems where under Newtonian interpretations, a significant amount of dark matter is required to explain observed kinematics. In fact, they are in this sense the most heavily dark matter dominated ... More
Intrinsic Charm in the NucleonOct 27 1999Oct 28 1999The quark spin and flavor structure of the nucleon is discussed in the SU(4) symmetry breaking chiral quark model. The spin and flavor contents for charm quarks and anti-charm quarks are predicted and compared with the results given by other models. The ... More
Polarized structure function $g_2$ in the CM bag modelApr 08 1996The spin-dependent structure functions $g_1(x)$, $g_2(x)$, ${g}_2^{WW}(x)$ and ${\bar g}_2(x)$ and their moments are studied in the CM bag model. The results show that (i) $\int_0^1g_2(x)dx=0$, i.e. the Burkhardt-Cottingham sum rule holds, hence $g_2(x)$ ... More
The energetic UniverseAug 09 2005In this paper I review the main topics on the energetic Universe that have been put forward as main science goals in the Cosmic Vision 2015-2025 exercise. I discuss the study of matter under extreme conditions (both under strong gravity and at ultra-high ... More
The ANDES Deep Underground LaboratoryJul 31 2013ANDES (Agua Negra Deep Experiment Site) is a unique opportunity to build a deep underground laboratory in the southern hemisphere. It will be built in the Agua Negra tunnel planned between Argentina and Chile, and operated by the CLES, a Latin American ... More
Modeling the Milky-Way Satellite galaxiesJun 19 2008We revisit the Milky Way satellite problem using a semi-analytical model of galaxy formation and compare the predicted luminosity function to recent result from the SDSS. With cosmic photoionization, the luminosity function can be brought into broad agreement ... More
A Phase Space Diagram for GravityMar 19 2012Apr 19 2012In modified theories of gravity including a critical acceleration scale, $a_{0}$, a critical length scale, $r_{M}=(GM/a_{0})^{1/2}$, will naturally arise, with the transition from the Newtonian to the dark matter mimicking regime occurring for systems ... More
Empirical Population Synthesis for 74 Blue Compact GalaxiesOct 17 2002We have observed the largest optical spectra sample of 74 blue compact galaxies. Stellar population properties of them were derived by comparing the equivalent widths of strong absorption features and continuum colors, using a method of empirical population ... More
Tagging photon interactions at the LHCJun 30 2008Photon interactions at the LHC result in striking final states with much lower hadronic activity in the central detectors than for pp interactions. In addition, the elastic exchange of a photon leads to a proton scattered at almost zero-degree angle. ... More
Measurement of Vcb and Charmless Hadronic B decays at CLEOJan 10 2001The recent results on the measurement of Vcb and charmless hadronic B decays from CLEO are presented.
Very deep spectroscopy of the bright Saturn Nebula NGC 7009 -- I. Observations and plasma diagnosticsMar 09 2011We present very deep CCD spectrum of the bright, medium-excitation planetary nebula NGC 7009, with a wavelength coverage from 3040 to 11000 A. Traditional emission line identification is carried out to identify all the emission features in the spectra, ... More
Issues on the transport of one dimensional systemsMay 16 2006In this paper, we will critically discuss recent theoretical and experimental developments on the transport of one dimensional quantum systems. In particular, we will focus on open issues and controversial results related to the finite temperature dynamics ... More
Ballistic transport in classical and quantum integrable systemsSep 13 2001In this essay, we first sketch the development of ideas on the extraordinary dynamics of integrable classical nonlinear and quantum many body Hamiltonians. In particular, we comment on the state of mathematical techniques available for analyzing their ... More
Impact parameter profile of synchrotron radiationMar 18 2005The horizontal impact parameter profile of synchrotron radiation, for fixed vertical angle of the photon, is calculated. This profile is observed through an astigmatic optical system, horizontally focused on the electron trajectory and vertically focused ... More
Some aspects of transversityDec 05 1995The specificities of transverse polarization with respect to helicity of ultrarelativistic fermions are pointed out. For massless fermions, a covariant transversity four-vector is defined, up to a kind of gauge transformation. The tranversity distribution ... More
A TBA description of thermal transport in the XXZ Heisenberg modelApr 28 2016It is shown that the Bethe ansatz formulation of the easy-plane 1D Heisenberg model thermodynamics (TBA) by Takahashi and Suzuki and the subsequent analysis of the spin Drude weight, also reproduces the thermal Drude weight and magnetothermal coefficient ... More
Analogy between free electron laser and channeling by crystal planesMar 21 2005The trapping of electrons in the ponderomotive potential wells, which governs a free electron laser or inverse free electron laser at high gain, is analogous to the channeling of charged particles by atomic planes of a crystal. A bent crystal is analogous ... More
Study of 3-flavor QCD Finite Temperature Phase Transition with Staggered FermionsNov 08 2001We have studied the 3-flavor, finite temperature, QCD phase transition with staggred fermions on an $ N_t=4$ lattice. By studying a variety of quark masses we have located the critical point, $m_c$, where the first order 3-flavor transition ends as lying ... More
Effect of intersubsystem coupling on the geometric phase in a bipartite systemMar 31 2004Oct 26 2004The influence of intersubsystem coupling on the cyclic adiabatic geometric phase in bipartite systems is investigated. We examine the geometric phase effects for two uniaxially coupled spin$-{1/2}$ particles, both driven by a slowly rotating magnetic ... More
Ricci flow on Kähler-Einstein manifoldsAug 27 2001Feb 15 2003In our previous paper math.DG/0010008, we develop some new techniques in attacking the convergence problems for the K\"ahler Ricci flow. The one of main ideas is to find a set of new functionals on curvature tensors such that the Ricci flow is the gradient ... More
Singularity and entropy of the viscosity dark energy modelOct 13 2009In this paper bulk viscosity is introduced to describe the effects of cosmic non-perfect fluid on the cosmos evolution and to build the unified dark energy (DE) with (dark) matter models. Also we derive a general relation between the bulk viscosity form ... More
Renormalization of Newton's constant and Particle PhysicsFeb 02 2010We report on particle physics applications of the renormalization group equation of Newton's constant.
Seesaw induced Higgs MechanismJun 10 2002Sep 09 2002We discuss a two scalar doublets model which induces the Higgs mechanism by means of a seesaw mechanism. This model naturally predicts a light Higgs scalar whose mass is suppressed by the grand unification scale. The model predicts an intermediate scale ... More
Substructure of the Nucleon in the Chiral Quark ModelFeb 18 2000The spin and orbital angular momentum carried by different quark flavors in the nucleon are calculated in the SU(3) chiral quark model with symmetry-breaking. The similar calculation is also performed for other octet and decuplet baryons. Furthermore, ... More
On the nonlinear response of a particle interacting with fermions in a 1D latticeApr 25 2010By the Bethe ansatz method we study the energy dispersion of a particle interacting by a local interaction with fermions (or hard core bosons) of equal mass in a one dimensional lattice. We focus on the period of the Bloch oscillations which turns out ... More
High temperature thermal conductivity of 2-leg spin-1/2 laddersApr 28 2003Based on numerical simulations, a study of the high temperature, finite frequency, thermal conductivity $\kappa(\omega)$ of spin-1/2 ladders is presented. The exact diagonalization and a novel Lanczos technique are employed.The conductivity spectra, analyzed ... More
Searching for the Missing Baryons in the Warm-Hot Intergalactic MediumNov 30 2007At low redshift (z<2), almost half of the baryons in the Universe are not found in bound structures like galaxies and clusters and therefore most likely reside in a Warm-Hot Intergalactic Medium (WHIM), as predicted by simulations. Attempts to detect ... More
Recursive fragmentation model with quark spin. Application to quark polarimetryJan 07 2010An elementary recursive model accounting for the quark spin in the fragmentation of a quark into mesons is presented. The quark spin degree of freedom is represented by a two-components spinor. Spin one meson can be included. The model produces Collins ... More
Probes of parton transversityFeb 01 1993Feb 02 1993An inventory is made of the experiments which can measure the transversely polarized quark distributions and fragmentation functions at leading twist. (Contribution to the 10th International Symposium on High Energy Spin Physics, Nagoya, Japan, Nov. 9-14, ... More
Radial Velocity Fitting Challenge. I. Simulating the data set including realistic stellar radial-velocity signalsJul 21 2016Stellar signals are the main limitation for precise radial-velocity (RV) measurements. These signals arise from the photosphere of the stars. The m/s perturbation created by these signals prevents the detection and mass characterization of small-mass ... More
Precision Measurement of the Neutron Spin Asymmetries and Spin-dependent Structure Functions in the Valence Quark RegionMay 12 2004Feb 01 2005We report on measurements of the neutron spin asymmetries $A_{1,2}^n$ and polarized structure functions $g_{1,2}^n$ at three kinematics in the deep inelastic region, with $x=0.33$, 0.47 and 0.60 and $Q^2=2.7$, 3.5 and 4.8 (GeV/c)$^2$, respectively. These ... More
N* Masses from QCD Sum RulesOct 26 2001We report N* masses in the spin-1/2 and spin-3/2 sectors using the method of QCD Sum Rules. They are based on three independent sets derived from generalized interpolating fields. The predictive ability of each sum rule is examined by a Monte-Carlo based ... More
Bosonisation of the Complex-boson realisation of $W_\infty$Sep 04 1991We bosonise the complex-boson realisations of the $W_\infty$ and $W_{1+\infty}$ algebras. We obtain nonlinear realisations of $W_\infty$ and $W_{1+\infty}$ in terms of a pair of fermions and a real scalar. By further bosonising the fermions, we then obtain ... More
Internal Josephson-Like Tunneling in Two-Component Bose-Einstein Condensates Affected by Sign of the Atomic Interaction and External Trapping PotentialMar 13 2007We study the Josephson-like tunneling in two-component Bose-Einstein condensates coupled with microwave field in respond to various attractive and repulsive atomic interaction under the various aspect ratio of trapping potential and the gravitational ... More
Dissipation Effects in Hybrid SystemsOct 25 2006The dissipation effect in a hybrid system is studied in this Letter. The hybrid system is a compound of a classical magnetic particle and a quantum single spin. Two cases are considered. In the first case, we investigate the effect of the dissipative ... More
Suppressing decoherence and improving entanglement by quantum-jump-based feedback control in two-level systemsSep 11 2010We study the quantum-jump-based feedback control on the entanglement shared between two qubits with one of them subject to decoherence, while the other qubit is under the control. This situation is very relevant to a quantum system consisting of nuclear ... More
Volume estimates for Kähler-Einstein metrics and rigidity of complex structuresApr 21 2011This paper extends our earlier results to higher dimensions using a different approach, based on the rigidity of complex structures on certain domains.
A Comment on "Memory Effects in an Interacting Magnetic Nanoparticle System"Mar 15 2004Recently, Sun et al reported that striking memory effects had been clearly observed in their new experiments on an interacting nanoparticle system [1]. They claimed that the phenomena evidenced the existence of a spin-glass-like phase and supported the ... More
X-ray and Optical Plateau Following the Main Bursts in Gamma-Ray Bursts and SNe II-P: A hint to the similar late injection behavior?Apr 01 2011Mar 12 2013We analyze the emission plateaus in the X-ray afterglow lightcurves of gamma-ray bursts (GRBs) and in the optical lightcurves of Type II superpernovae (SNe IIP) in order to study whether they have similar late energy injection behaviors. We show that ... More
Dynamics of DistillabilityMay 30 2003The time evolution of a maximally entangled bipartite systems is presented in this paper. The distillability criterion is given in terms of Kraus operators. Using the criterion, we discuss the distillability of $2\times 2$ and $n\times n (n>2)$ systems ... More
Dissipative stabilization of quantum-feedback-based multipartite entanglement with Rydberg atomsDec 31 2016A quantum-feedback-based scheme is proposed for generating multipartite entanglements of Rydberg atoms in a dissipative optical cavity. The Rydberg blockade mechanism efficiently prevents double excitations of the system, which is further exploited to ... More
Couplings between Majorana bound states mediated by topologically-trivial chainsJul 13 2015Oct 02 2015We examine the couplings between two Majorana bound states mediated by topologically-trivial chains. Four types of chain are considered, e.g., the Kitaev chain with/without pairing couplings to the Majorana fermion, the Kitaev chain with next nearest-neighbor ... 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
The fastest rotating pulsar: A strange star?Jan 01 2001Mar 28 2001According to the observational limits on the radius and mass, the fastest rotating pulsar (PSR 1937+21) is probably a strange star, or at least some neutron star equations of state should be ruled out, if we suggest that a dipole magnetic field is relevant ... 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
Extended Techniques for Feedback Control of A Single QubitAug 09 2013The protection of quantum states is challenging for non-orthogonal states especially in the presence of noises. The recent research breakthrough shows that this difficulty can be overcome by feedback control with weak measurements. However, the state-protection ... 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
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
Robust state transfer with high fidelity in spin-1/2 chains by Lyapunov controlMay 19 2015Based on the Lyapunov control, we present a scheme to realize state transfer with high fidelity by only modulating the boundary spins in a quantum spin-1/2 chain. Recall that the conventional transmission protocols aim at nonstationary state (or information) ... More
Preparation of topological modes by Lyapunov controlNov 20 2014Sep 14 2015By Lyapunov control, we present a proposal to drive quasi-particles into a topological mode in quantum systems described by a quadratic Hamiltonian. The merit of this control is the individual manipulations on the boundary sites. We take the Kitaev's ... More
Power Minimization in Multi-pair Two-Way RelayingJun 24 2013Sep 03 2014This doc provides some proofs in our submitted journal paper.
A new parametric equation of state and quark starsSep 22 2010It is still a matter of debate to understand the equation of state of cold supra-nuclear matter in compact stars because of unknown on-perturbative strong interaction between quarks. Nevertheless, it is speculated from an astrophysical view point that ... More
The Relation of Thermal Fluctuation and Information-Entropy for One-Dimensional Rindler OscillatorDec 19 2001Dec 20 2001Within the framework of thermo-field-dynamics (TFD), the information-entropies associated with the measurements of position and momentum for one-dimensional Rindler oscillator are derived, and the connection between its information-entropy and thermal ... More
Towards the explicit computation of Bohm velocities associated to N-electron wave-functions with arbitrary spin-orientationsAug 19 2014The direct solution of the many-particle Schr\"odinger equation is computationally inaccessible for more than very few electrons. In order to surpass this limitation, one of the authors [X. Oriols, Phys. Rev. Lett. 2007, 98 (066803)] has recently proposed ... More
Volume estimates for Kähler-Einstein metrics: the three dimensional caseApr 01 2011Apr 21 2011We obtain an estimate for the volume of neighbourhoods of sets of large curvature in three-dimensional K\"ahler-Einstein manifolds.
A Polytropic Model of Quark StarsApr 07 2008Dec 09 2008A polytropic quark star model is suggested in order to establish a general framework in which theoretical quark star models could be tested by observations. The key difference between polytropic quark stars and the polytropic model studied previously ... More
Small glitches: the role of strange nuggets?Jun 11 2015Dec 24 2015Pulsar glitches, i.e. the sudden spin-ups of pulsars, have been detected for most pulsars that we known. The mechanism giving rise to this kind of phenomenon is uncertain, although a large data set has been built. In the framework of star-quake model, ... More
Spontaneous Magnetization of Solid Quark-cluster StarsOct 18 2014May 24 2016Pulsar-like compact stars usually have strong magnetic fields, with the strength from $\sim 10^8$ to $\sim 10^{12}$ Gauss on surface. How such strong magnetic fields can be generated and maintained is still an unsolved problem, which is, in principle, ... More
Quantum gates by periodic drivingMay 19 2015Sep 12 2015Topological quantum computation has been extensively studied due to its robustness against decoherence. A conventional way to realize it is by adiabatic operations---it requires relatively long time to accomplish so that the speed of quantum computation ... More
Factoring the unitary evolution operator and quantifying entanglementMar 07 2000The unitary evolution can be represented by a finite product of exponential operators. It leads to a perturbative expression of the density operator of a close system. Based on the perturbative expression scheme, we present a entanglement measure, this ... More
Geometric phases in a scattering processMar 19 2011The study of geometric phase in quantum mechanics has so far be confined to discrete (or continuous) spectra and trace preserving evolutions. Consider only the transmission channel, a scattering process with internal degrees of freedom is neither a discrete ... More
Fermi gas in harmonic oscillator potentialsMar 08 2000Assuming the validity of grand canonical statistics, we study the properties of a spin-polarized Fermi gas in harmonic traps. Universal forms of Fermi temperature $T_F$, internal energy $U$ and the specific heat per particle of the trapped Fermi gas are ... More
A note on the discovery of a 2M_\odot pulsarNov 02 2010Nov 07 2010It is conventionally thought that the state equation of dense matter softens and thus cannot result in high maximum mass if pulsars are quark stars, and that a recently discovered $2M_\odot$ pulsar (PSR J1614-2230) may make quark stars to be unlikely. ... More
Lennard-Jones quark matter and massive quark starsMay 18 2009Jun 18 2009Quark clustering could occur in cold quark matter because of the strong coupling between quarks at realistic baryon densities of compact stars. Although one may still not be able to calculate this conjectured matter from first principles, the inter-cluster ... More
Rapid population transfer of a two-level system by a polychromatically driving fieldNov 10 2018We propose a simple exact analytical solution for a model consisting of a two-level system and a polychromatically driving field. It helps us to realize a rapid complete population transfer from the ground state to the excited state, and the system can ... More
The masses of hot subdwarfsSep 14 2009Masses are a fundamental parameter, but they are not well known for most hot subdwarfs. In general, the mass of a hot subdwarf is derived with asteroseismology or dynamical methods, for which it is often difficult to obtain the necessary data from observations. ... More
Some results on generalized strong external difference familiesSep 09 2017Nov 20 2017A generalized strong external difference family (briefly $(v, m; k_1,\dots,k_m; \lambda_1,\dots,\lambda_m)$-GSEDF) was introduced by Paterson and Stinson in 2016. In this paper, we construct some new GSEDFs for $m=2$ and use them to obtain some results ... More
The Impact of Type Ia Supernova Explosions on their Companions in Binary SystemJun 25 2007Using a simple analytic method, we calculate the impact effect between the ejecta of a SN Ia and its companion to survey the influence of initial parameters of the progenitor's system, which is useful for searching the companion in a explosion remnant. ... More
Predicting Unconventional High Temperature Superconductors in Trigonal Bipyramidal CoordinationsJun 12 2015Jun 19 2015Cuprates and iron-based superconductors are two classes of unconventional high Tc superconductors based on 3d transition elements. Recently, two principles, correspondence principle and magnetic selective pairing rule, have been emerged to unify their ... More
Domain Walls as Spin Wave WaveguidesDec 18 2015Dec 23 2015We numerically demonstrate that domain walls can be used as spin wave waveguides. We show that gapless spin waves bounded inside a domain wall can be guided by the domain wall. For Bloch walls, we further show that the bound spin waves can pass through ... More
The sinusoidal periodicity nature for M>=5 global earthquakesJul 19 2016By using the M>=5 global earthquake data for Jan. 1950 to Dec. 2015, we performed statistical analyses for the parameters magnitude, time, and depth on a yearly scale. The magnitude spectrum, which is the earthquake number accumulated at different magnitudes, ... More
Gauge field in ultra-cold bipartite atomsMar 25 2006The effects of entanglement and spin-spin collision on the gauge field in ultracold atoms are presented in this paper. Two gauge fields are calculated and discussed. One of the fields comes from space dependent spin-spin collisions in ultra-cold atoms, ... More
On the weak Kähler-Ricci flowFeb 06 2008In this note, we define and study K\"ahler-Ricci flow with initial data not being smooth with some natural applications.
Negative Magnetoresistance in the Nearest-neighbor Hopping ConductionMar 06 1997We propose a size effect which leads to the negative magnetoresistance in granular metal-insulator materials in which the hopping between two nearest neighbor clusters is the main transport mechanism. We show that the hopping probability increases with ... More
Unconventional Rydberg pumping and applications in quantum information processingJun 14 2018Jul 02 2018We propose a mechanism of unconventional Rydberg pumping (URP) via simultaneously driving each Rydberg atom by two classical fields with different strengths of Rabi frequencies. This mechanism differs from the general Rydberg blockade or Rydberg antiblockade ... More
Quantum Lyapunov control with machine learningAug 07 2018Quantum state engineering is a central task in Lyapunov-based quantum control. Given different initial states, better performance may be achieved if the control parameters, such as the Lyapunov function, are individually optimized for each initial state, ... More
Develop machine learning based predictive models for engineering protein solubilityJun 29 2018Jul 20 2018Protein activity is a significant characteristic for recombinant proteins which can be used as biocatalysts. High activity of proteins reduces the cost of biocatalysts. A model that can predict protein activity from amino acid sequence is highly desired, ... More
Classic Lagrangian may not be applicable to the traveling salesman problemMar 20 2014In this short note, the dual problem for the traveling salesman problem is constructed through the classic Lagrangian. The existence of optimality conditions is expressed as a corresponding inverse problem. A general 4-cities instance is given, and the ... More
Effects of disorder on superlensing in two dimensional photonic crystal slabsSep 30 2004We demonstrate that a hexagonal two dimensional photonic crystal can act as an isotropic medium with an effective refractive index n_eff = -1, therefore capable of unrestricted superlensing. We study the superlensing by calculating the photonic band structure, ... More
Spin and energy correlations in the one dimensional spin 1/2 Heisenberg modelNov 25 1997In this paper, we study the spin and energy dynamic correlations of the one dimensional spin 1/2 Heisenberg model, using mostly exact diagonalization numerical techniques. In particular, observing that the uniform spin and energy currents decay to finite ... More
The star cluster system of the luminous elliptical galaxy NGC 1600Oct 08 2008Luminous elliptical galaxies generally display a rich star cluster system, whose properties provide strong constraints on the physics of galaxy formation and evolution. Star cluster system studies, however, concentrate on galaxies located in nearby or ... More