Results for "X. Holzapfel"

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Observation of Zero Resistance in As-Electrodeposited FeSeNov 28 2017Superconducting FeSe films were electrochemically deposited on rolling-assisted biaxially textured substrate (RABiTS) tape. We observed zero resistivity in the as-electrodeposited FeSe film prepared on the RABiTS when the appropriate voltage was applied ... More
Entanglement of Fermi gases in a harmonic trapOct 27 2005For both cases with and without interactions, bipartite entanglement of two-fermions from a Fermi gas in a trap is investigated. We show how the entanglement depends on the locations of the two fermions and the total number of particles. Fermions at the ... More
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
Quantum logic gates and maximally entangled states in microtrapsApr 05 2002Apr 08 2002This paper has been withdrawn because the first author submitted the paper without previously consulting the rest of the authors.
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.
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
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
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
Friedmann cosmology with bulk viscosity: a concrete model for dark energyDec 29 2008The universe content is considered as a non-perfect fluid with bulk viscosity and can be described by a general equation of state (endowed some deviation from the conventionally assumed cosmic perfect fluid model). An explicitly bulk viscosity dark energy ... 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
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
Geometry of Kähler Metrics and Foliations by Holomorphic DiscsJul 07 2005The purpose of this paper is to establish a completely new partial regularity theory on certain homogeneous complex Monge-Ampere equations. Our partial regularity theory will be obtained by studying foliations by holomorphic curves and and their relations ... More
Geometric phases induced in auxiliary qubits by many-body systems near its critical pointsMar 07 2007The geometric phase induced in an auxiliary qubit by a many-body system is calculated and discussed. Two kinds of coupling between the auxiliary qubit and the many-body system are considered, which lead to dephasing and dissipation in the qubit, respectively. ... 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
Lepton flavor violation from low scale seesaw neutrinos with masses reachable at the LHCOct 22 2017Flavor physics has been crucial in the development of particle physics and it will keep being so in the future. Nowadays, this kind of processes, in particular lepton flavor changing observed in neutrino oscillations, give us the clearest evidence of ... 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
The weak angle gamma from one-particle inclusive CP asymmetries in the B(s) systemMar 29 2000We compute CP asymmetries of one-particle inclusive B(s) --> D(s) X decay rates. We find that the weak angle gamma could in principle be extracted from these asymmetries although they are very small. Taking the decay width difference into account, we ... More
Quark Spin and Orbital Angular Momentum in the Chiral Quark ModelOct 21 1998Nov 25 1998Quark spin and orbital angular momentum in the nucleon are calculated in symmetry-breaking chiral quark model. The results are compared with data and other models.
Modified Wandzura-Wilczek Relation with the Nachtmann VariableAug 10 2000Dec 16 2000If one retains M^2/Q^2 terms in the kinematics, the Nachtmann variable \xi seems to be more appropriate to describe deep inelastic lepton-nucleon scattering. Up to the first power of M^2/Q^2, a modified Wandzura-Wilczek relation with respect to \xi was ... More
Quark Orbital Motion in the NucleonJan 17 1998Jan 21 1998An unified scheme for describing both spin and orbital motion in symmetry-breaking chiral quark model is suggested. The analytic results of the spin and orbital angular momenta carried by different quark flavors in the nucleon are given. The quark spin ... More
Structure of lexicographic Groebner bases in three variables of ideals of dimension zeroOct 14 2011We generalize the structural theorem of Lazard in 1985, from 2 variables to 3 variables. We use the Gianni-Kalkbrener result to do this, which implies some restrictions inside which lies the case of a radical ideal.
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
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
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
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
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
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
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
Jc Scaling and Anisotropies in Co-doped Ba-122 thin filmsDec 07 2010We have successfully grown epitaxial, superconducting films of Ba(Fe1-xCox)2As2 (Ba-122)with x ~ 0.1. The films grow without observable correlated defects parallel to the c-axis, as confirmed by TEM. This is also reflected in the absence of a caxis peak ... 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
Revisiting the Excitation Energy Transfer in the Fenna-Matthews-Olson ComplexAug 23 2012It is believed that the quantum coherence itself cannot explain the very high excitation energy transfer (EET) efficiency in the Fenna-Matthews-Olson (FMO) complex. In this paper, we show that this is not the case if the inter-site couplings take complex ... 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
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
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
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
Dissipation-based entanglement via quantum Zeno dynamics and Rydberg antiblockadeMay 10 2017A novel scheme is proposed for dissipative generation of maximally entanglement between two Rydberg atoms in the context of cavity QED. The spontaneous emission of atoms combined with quantum Zeno dynamics and Rydberg antiblockade guarantees a unique ... 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
An Arcminute Resolution Search at 4.7CM^-1 for Point Sources in Msam and Max FieldsSep 09 1994We have searched for mm-wave emission from compact objects in two fields, each approximately 1 square degree in size, taken from regions of the sky in which degree-scale structure in the Cosmic Background Radiation (CBR) has recently been reported. The ... 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
Dynamics of the entanglement rate in the presence of decoherenceMay 24 2003The dynamics of the entanglement rate are investigated in this paper for pairwise interaction and two special sets of initial states. The results show that for the given interaction and the decoherence scheme, the competitions between decohering and entangling ... More
Fusing atomic $W$ states via quantum Zeno dynamicsOct 17 2017We propose a scheme for preparation of large-scale entangled $W$ states based on the fusion mechanism via quantum Zeno dynamics. By sending two atoms belonging to an $n$-atom $W$ state and an $m$-atom $W$ state, respectively, into a vacuum cavity (or ... 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
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.
Detecting ground-state degeneracy in many-body systems through qubit decoherenceMay 20 2016Dec 24 2016By coupling with a qubit, we demonstrate that qubit decoherence can unambiguously detect the occurrence of ground-state degeneracy in many-body systems. We first demonstrate universality using the two-band model. Consequently, several exemplifications, ... 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
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
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.
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
Initial-Final Mass Relationship for Stars of Different MetallicitiesOct 12 2007May 21 2008Following Paczy\'{n}ski & Zi\'{o}lkowski (1968) and Han et al. (1994), we assume that the envelope of an asymptotic giant branch (AGB) or a first giant branch (FGB) star is lost when the binding energy of the envelope is equal to zero ($\Delta W=0$) and ... More
Nonlinear effect on quantum control for two-level systemsJun 05 2009The traditional quantum control theory focuses on linear quantum system. Here we show the effect of nonlinearity on quantum control of a two-level system, we find that the nonlinearity can change the controllability of quantum system. Furthermore, we ... 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
McMillan Formula: long-standing myth and a novel implementation to reveal high $T_c$ in beryllium-based alloysJul 17 2019A historical myth surrounding the McMillan formula for $T_c$ is clarified, and a misconception about superconductor classes is updated with the virtual crystal model. It emerges that in a Be-based alloy $T_c\simeq 33$ K or higher is possible when a proper ... More
Power Minimization in Multi-pair Two-Way RelayingJun 24 2013Sep 03 2014This doc provides some proofs in our submitted journal paper.
Adiabatic geometric phases in hydrogenlike atomsMay 09 2005Nov 02 2005We examine the effect of spin-orbit coupling on geometric phases in hydrogenlike atoms exposed to a slowly varying magnetic field. The marginal geometric phases associated with the orbital angular momentum and the intrinsic spin fulfill a sum rule that ... 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
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
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
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
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
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
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
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.
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
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
Spectral Efficiency of the Cellular Two-Way Relaying with Large Antenna ArraysSep 03 2014This paper considers a multiuser cellular two-way relay network (cTWRN) where multiple users exchange information with a base station (BS) via a relay station (RS). Each user is equipped with a single antenna, while both the BS and the RS are equipped ... More