Results for "W. L. Yang"

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Solution of the dual reflection equation for $A^{(1)}_{n-1}$ SOS modelAug 19 2003Oct 25 2004We obtain a diagonal solution of the dual reflection equation for elliptic $A^{(1)}_{n-1}$ SOS model. The isomorphism between the solutions of the reflection equation and its dual is studied.
Modular transformation and twist between trigonometric limits of $sl(n)$ elliptic R-matrixMar 23 2001Nov 15 2001We study the modular transformation of ${\bf Z}_n$-symmetric elliptic R-matrix and construct the twist between the trigonometric degeneracy of the elliptic R-matrix.
Exact solution of $Z_n$ Belavin model with open boundary conditionAug 20 2003$Z_n$ Belavin model with open boundary condition is studied. The double-row transfer matrices of the model are diagonalized by algebraic Bethe ansatz method in terms of the intertwiner and the face-vertex correspondence relation. The eigenvalues and the ... More
Solar Models with Revised Abundances and OpacitiesMay 23 2008Using reconstructed opacities, we construct solar models with low heavy-element abundance. Rotational mixing and enhanced diffusion of helium and heavy elements are used to reconcile the recently observed abundances with helioseismology. The sound speed ... More
Central elements of the elliptic $Z_n$ monodromy matrix algebra at roots of unityApr 13 2004Feb 27 2005The central elements of the algebra of monodromy matrices associated with the $\mathbb{Z}_n$ R-matrix are studied. When the crossing parameter $w$ takes a special rational value $w=\frac{n}{N}$, where $N$ and $n$ are positive coprime integers, the center ... More
Hole spin relaxation in bilayer WSe$_2$Jun 15 2015We investigate the hole spin relaxation due to the Rashba spin-orbit coupling induced by an external perpendicular electric field in bilayer WSe$_2$. The Rashba spin-orbit coupling coefficients in bilayer WSe$_2$ are constructed from the corresponding ... More
Thermal And Mechanical Analysis of High-power Light-emitting Diodes with Ceramic PackagesJan 07 2008In this paper we present the thermal and mechanical analysis of high-power light-emitting diodes (LEDs) with ceramic packages. Transient thermal measurements and thermo-mechanical simulation were performed to study the thermal and mechanical characteristics ... More
Dynamically twisted algebra $A_{q,p;\hatπ}(\hat{gl_2})$ as current algebra generalizing screening currents of q-deformed Virasoro algebraSep 13 1997Oct 24 1997In this paper, we propose an elliptic algebra $A_{q,p;\hat{\pi}}(\hat{gl_2})$ which is based on the relations $RLL=LLR^{*}$, where $R$ and $R^{*}$ are the dynamical R-maxtrices of $A^{(1)}_{1}$ type face model with the elliptic moduli shifted by the center ... More
Angular momentum transport and element mixing in the stellar interior I. Application to the rotating SunMay 23 2008The purpose of this work was to obtain diffusion coefficient for the magnetic angular momentum transport and material transport in a rotating solar model. We assumed that the transport of both angular momentum and chemical elements caused by magnetic ... More
The frequency separations of stellar p-modesJun 21 2007Sep 03 2007Aims. The purpose of this work is to investigate a new frequency separation of stellar p-modes and its characteristics. Methods. Frequency separations are deduced from the asymptotic formula of stellar p-modes. Then, using the theoretical adiabatic frequencies ... More
Nearly isotropic spin-pumping related Gilbert damping in Pt/Ni$_{81}$Fe$_{19}$/PtOct 24 2018Feb 22 2019A recent theory by Chen and Zhang [Phys. Rev. Lett. 114, 126602 (2015)] predicts strongly anisotropic damping due to interfacial spin-orbit coupling in ultrathin magnetic films. Interfacial Gilbert-type relaxation, due to the spin pumping effect, is predicted ... More
Bell-state preparation for fullerene based electron spins in distant peapod nanotubesSep 18 2008We propose a potentially practical scheme, in combination with the Bell-state analyzer [Zhang et al., Phys. Rev. A 73, 014301 (2006)], to generate Bell states for two electron spins confined, respectively, in two distant fullerenes. To this end, we consider ... More
Several Localized Waves Induced by Linear Interference between a Nonlinear Plane Wave and Bright SolitonsAug 31 2017We investigate linear interference effects between a nonlinear plane wave and bright solitons, which are admitted by pair-transition coupled two-component Bose-Einstein condensate. We demonstrate the interference effects can induce several localized waves ... More
Realizing Topological Transition in a Non-Hermitian Quantum Walk with Circuit QEDJan 08 2016Apr 06 2016We extend the non-Hermitian one-dimension quantum walk model [PRL 102, 065703 (2009)] by taking dephasing effect into account. We prove that the feature of topological transition does not change even when dephasing between the sites within units is present. ... More
$Z_n$ elliptic Gaudin model with open boundariesSep 01 2004Oct 18 2004The $Z_n$ elliptic Gaudin model with integrable boundaries specified by generic non-diagonal K-matrices with $n+1$ free boundary parameters is studied. The commuting families of Gaudin operators are diagonalized by the algebraic Bethe ansatz method. The ... More
Implementation of three-qubit Grover search in cavity QEDJul 03 2007Using resonant interaction of three Rydberg atoms with a single-mode microwave cavity, we consider a realization of three-qubit Grover search algorithm in the presence of weak cavity decay, based on a previous idea for three-qubit quantum gate [Phys. ... More
Proposed method for direct measurement of non-Markovian character of the qubits coupled to bosonic reservoirsDec 15 2009Mar 24 2010The non-Markovianity is a recently proposed characterization of the non-Markovian behavior in an open quantum system, based on which we first present a practical idea for directly measuring the non-Markovian character of a single qubit coupled to a zero-temperature ... More
Realizing Topological Transition in a Non-Hermitian Quantum Walk with Circuit QEDJan 08 2016Mar 25 2017We extend the non-Hermitian one-dimensional quantum walk model [Phys. Rev. Lett. 102, 065703 (2009)] by taking the dephasing effect into account. We prove that the feature of topological transition does not change even when dephasing between the sites ... 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
Comments on k-Strings at Large NDec 29 2010Jan 04 2011We present a computation of the k-string tension in the large N limit of the two dimensional lattice Yang-Mills theory. It is well known that the problems of computing the partition function and the Wilson loop can be both reduced to a unitary matrix ... More
Quantum-memory-assisted entropic uncertainty relation with a single nitrogen-vacancy center in diamondSep 30 2012Dec 22 2012The limitation of simultaneous measurements of noncommuting observables can be eliminated when the measured particle is maximally entangled with a quantum memory. We present a proposal for testing this quantum-memory-assisted entropic uncertainty relation ... More
Quantum Teleportation: from Pure to Mixed States and Standard to OptimalAug 01 2003Teleportation for pure states, mixed states with standard and optimal protocols are introduced and investigated systematically. An explicit equation governing the teleportation of finite dimensional quantum pure states by a generally given non-local entangled ... More
Solution to Satisfiability problem by a complete Grover search with trapped ionsNov 18 2008The main idea in the original Grover search (Phys. Rev. Lett. 79, 325 (1997)) is to single out a target state containing the solution to a search problem by amplifying the amplitude of the state, following the Oracle's job, i.e., a black box giving us ... More
Coherent lepton pair production in hadronic heavy ion collisionsApr 05 2018Recently, significant enhancements of $e^{+} e^{-}$ pair production at very low transverse momentum ($p_{T} < 0.15$ GeV/c) were observed by the STAR collaboration in peripheral hadronic A+A collisions. This excesses can not be described by the QGP thermal ... More
Quantum-memory-assisted entropic uncertainty principle under noiseMar 15 2012The measurement outcomes of two incompatible observables on a particle can be precisely predicted when it is maximally entangled with a quantum memory, as quantified recently [Nature Phys. 6, 659 (2010)]. We explore the behavior of the uncertainty relation ... More
Dissipative dynamics of quantum discord under quantum chaotic environmentOct 19 2010We investigate the dissipative dynamics of quantum discord in a decoherence model with two initially entangled qubits in addition to a quantum kicked top. The two qubits are uncoupled during the period of our study and one of them interacts with the quantum ... More
A Burgers-KPZ Type Parabolic Equation \par\noindent for the Path-Independence of the Density of the Girsanov TransformationMay 26 2010Let $X_t$ solve the multidimensional It\^o's stochastic differential equations on $\R^d$ $$dX_t=b(t,X_t)dt+\sigma(t,X_t)dB_t$$ where $b:[0,\infty)\times\R^d\to\R^d$ is smooth in its two arguments, $\sigma:[0,\infty)\times\R^d\to\R^d\otimes\R^d$ is smooth ... More
Determination of the Sign of g factors for Conduction Electrons Using Time-resolved Kerr RotationDec 23 2009The knowledge of electron g factor is essential for spin manipulation in the field of spintronics and quantum computing. While there exist technical difficulties in determining the sign of g factor in semiconductors by the established magneto-optical ... More
Phonon induced two-mode squeezing of nitrogen-vacancy center ensemblesDec 29 2015We propose a potentially practical scheme for realization of two-mode squeezed state with respect to two distant nitrogen-vacancy center ensembles coupled to two interconnected mechanical modes of diamond nanoresonators. By making use of the tunable phonon-spin ... More
Free boson representation of $DY_{\hbar}(\hat{sl} (M+1|N+1)) $ at level oneMar 21 2001Nov 15 2001We construct a realization of the central extension of super-Yangian double $DY_{\hbar}(\hat{sl}(M+1|N+1))$ at level-one in terms of free boson fields with a continuous parameter.
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
Chiral and helical $p$-wave superconductivity in doped bilayer BiHSep 17 2018We investigate the superconductivity (SC) driven by correlation effects in electron-doped bilayer BiH near a type-II van Hove singularity (vHS). By functional renormalization group, we find triplet $p$-wave pairing prevails in the interaction parameter ... More
Interaction Effects and Pseudogap in Two-Dimensional Lateral Tunnel JunctionsFeb 28 2006Tunneling characteristics of a two-dimensional lateral tunnel junction (2DLTJ) are reported. A pseudogap on the order of Coulomb energy is detected in the tunneling density of states (TDOS) when two identical two-dimensional electron systems are laterally ... More
Raman spectroscopic determination of the length, strength, compressibility, Debye temperature, elasticity, and force constant of the C-C bond in grapheneSep 19 2011From the perspective of bond relaxation and vibration, we have reconciled the Raman shifts of graphene under the stimuli of the number-of-layer, uni-axial-strain, pressure, and temperature in terms of the response of the length and strength of the representative ... More
Cascade of Quantum Phase Transitions in Tunnel-Coupled Edge StatesNov 03 2003Feb 04 2004We report on the cascade of quantum phase transitions exhibited by tunnel-coupled edge states across a quantum Hall line junction. We identify a series of quantum critical points between successive strong and weak tunneling regimes in the zero-bias conductance. ... More
Scaling p_T distributions for p and \bar{p} produced in Au+Au collisions at RHICApr 09 2007Oct 12 2007With the experimental data from STAR and PHENIX on the centrality dependence of the $p_T$ spectra of protons and anti-protons produced at mid-rapidity in Au+Au collisions at 200 GeV, we show that for protons and anti-protons there exists a scaling distribution ... More
Quantum network of superconducting qubits through opto-mechanical interfaceJul 18 2014Jan 08 2015We propose a scheme to realize quantum networking of superconducting qubits based on the opto-mechanical interface. The superconducting qubits interact with the microwave photons, which then couple to the optical photons through the opto-mechanical interface. ... More
Microwave spectroscopic observation of a Wigner solid within the 1/2 fractional quantum Hall effectApr 30 2015Mar 26 2016The fractional quantum Hall effect (FQHE) states at half integer Landau fillings ($\nu$) have long been of great interest, since they have correlations that differ from those of the fundamental Laughlin states found at odd denominators. At $\nu=1/2$ the ... More
Universal scaling of the pion, kaon and proton $p_{\rm{T}}$ spectra in Pb-Pb collisions at 2.76 TeVMay 07 2018With the experimental data collected by the ALICE collaboration in Pb-Pb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0-5$\%$, 5-10$\%$, 10-20$\%$, 20-40$\%$, 40-60$\%$ and 60-80$\%$), we investigate ... More
Composite Fermions with Tunable Fermi Contour AnisotropyFeb 11 2013Jun 15 2013The composite fermion formalism elegantly describes some of the most fascinating behaviours of interacting two-dimensional carriers at low temperatures and in strong perpendicular magnetic fields. In this framework, carriers minimize their energy by attaching ... More
Spin and charge distribution symmetry dependence of stripe phases in two-dimensional electron systems confined to wide quantum wellsJul 18 2012Measurements in clean two-dimensional electron systems confined to wide GaAs quantum wells in which two electric subbands are occupied reveal an unexpected rotation of the orientation of the stripe phase observed at a half-filled Landau level. Remarkably, ... More
Anomalous robustness of the 5/2 fractional quantum Hall state near a sharp phase boundaryJun 01 2011Sep 07 2011We report magneto-transport measurements in wide GaAs quantum wells with tunable density to probe the stability of the fractional quantum Hall effect at filling factor $\nu = $ 5/2 in the vicinity of the crossing between Landau levels (LLs) belonging ... More
Observation of reentrant quantum Hall states in the lowest Landau levelNov 23 2011Measurements in very low disorder two-dimensional electrons confined to relatively wide GaAs quantum well samples with tunable density reveal reentrant $\nu=1$ integer quantum Hall states in the lowest Landau level near filling factors $\nu=4/5$ and 6/5. ... More
A low-phase-noise 18 GHz Kerr frequency microcomb phase-locked over 65 THzFeb 18 2015Laser frequency combs are coherent light sources that simultaneously provide pristine frequency spacings for precision metrology and the fundamental basis for ultrafast and attosecond sciences. Recently, nonlinear parametric conversion in high-Q microresonators ... More
Composite Fermions Waltz to the Tune of a Wigner CrystalOct 13 2014Jun 01 2016When the kinetic energy of a collection of interacting two-dimensional (2D) electrons is quenched at very high magnetic fields so that the Coulomb repulsion dominates, the electrons are expected to condense into an ordered array, forming a quantum Wigner ... More
Evidence for a $ν=5/2$ Fractional Quantum Hall Nematic State in Parallel Magnetic FieldsFeb 26 2013We report magneto-transport measurements for the fractional quantum Hall state at filling factor $\nu=$ 5/2 as a function of applied parallel magnetic field ($B_{||}$). As $B_{||}$ is increased, the 5/2 state becomes increasingly anisotropic, with the ... More
A search for hypercompact HII regions in the Galactic PlaneSep 02 2018Nov 09 2018We have carried out the largest and most unbiased search for hypercompact (HC) HII regions. Our method combines four interferometric radio continuum surveys (THOR, CORNISH, MAGPIS and White2005) with far-infrared and sub-mm Galactic Plane surveys to identify ... More
Vertical Confinement and Evolution of Reentrant Insulating Transition in the Fractional Quantum Hall RegimeFeb 24 2003We have observed an anomalous shift of the high field reentrant insulating phases in a two-dimensional electron system (2DES) tightly confined within a narrow GaAs/AlGaAs quantum well. Instead of the well-known transitions into the high field insulating ... More
Phase stabilization of Kerr frequency comb internally without nonlinear optical interferometryNov 09 2016Optical frequency comb (OFC) technology has been the cornerstone for scientific breakthroughs such as precision frequency metrology, redefinition of time, extreme light-matter interaction, and attosecond sciences. While the current mode-locked laser-based ... More
Observation of An Anisotropic Wigner CrystalJan 26 2016We report a new correlated phase of two-dimensional charged carriers in high magnetic fields, manifested by an anisotropic insulating behavior at low temperatures. It appears near Landau level filling factor $\nu=1/2$ in hole systems confined to wide ... More
Unusual Landau Level Pinning and Correlated $ν=1$ Quantum Hall Effect in Hole Systems Confined to Wide GaAs Quantum WellsJan 16 2016In two-dimensional hole systems confined to wide GaAs quantum wells, where the heavy- and light- hole states are close in energy, we observe a very unusual crossing of the lowest two Landau levels as the sample is tilted in magnetic field. At a magic ... More
Smooth coherent Kerr frequency combs generation with broadly tunable pump by higher order mode suppressionFeb 02 2016High-Q microresonator has been suggested a promising platform for optical frequency comb generation, via dissipative soliton formation. To achieve a higher Q and obtain the necessary anomalous dispersion, $Si_3N_4$ microresonators made of multi-mode waveguides ... More
Microwave photoresistance of a high-mobility two-dimensional electron gas in a triangular antidot latticeJul 27 2006The microwave (MW) photoresistance has been measured on a high-mobility two-dimensional electron gas patterned with a shallow triangular antidot lattice, where both the MW-induced resistance oscillations (MIRO) and magnetoplasmon (MP) resonance are observed ... More
Influence of a Parallel Magnetic Field on Microwave Photoconductivity in a High-Mobility 2D Electron SystemApr 27 2005We have studied experimentally the influence of a parallel magnetic field ($B_{//}$) on microwave-induced resistance oscillations (MIRO) and zero-resistance states (ZRS) previously discovered in a high-mobility 2D electron system. We have observed a strong ... More
Optimal joint measurements of complementary observables by a single trapped ionMay 03 2017The uncertainty relations, pioneered by Werner Heisenberg nearly 90 years ago, set a fundamental limitation on the joint measurability of complementary observables. This limitation has long been a subject of debate, which has been reignited recently due ... More
Quantum Fisher information as signature of superradiant quantum phase transitionDec 05 2013Dec 09 2013The single-mode Dicke model is well-known to undergo a quantum phase transition from the so-called normal phase to the supperradiant phase (hereinafter called the "superradiant quantum phase transition"). Normally, quantum phase transitions are closely ... More
The q-Log-convexity of the Generating Functions of the Squares of Binomial CoefficientsOct 13 2008We prove a conjecture of Liu and Wang on the q-log-convexity of the polynomial sequence $\{\sum_{k=0}^n{n\choose k}^2q^k\}_{n\geq 0}$. By using Pieri's rule and the Jacobi-Trudi identity for Schur functions, we obtain an expansion of a sum of products ... More
Parity symmetry and parity breaking in the quantum Rabi model with addition of Ising interactionApr 28 2014We explore the possibility to generate new parity symmetry in the quantum Rabi model after a bias is introduced. In contrast to a mathematical treatment in a previous publication [J. Phys. A 46, 265302 (2013)], we consider a physically realistic method ... More
Ion-crystal demonstration of structural phase transition induced solely by temperatureDec 11 2018We demonstrate for the first time a linear-zigzag phase transition induced solely by temperature of the $^{40}$Ca$^{+}$ ion crystals in a surface-electrode trap. In contrast to the previously observed counterparts based on change of the mechanical equilibrium ... More
Vacancy Induced Splitting of Dirac Nodal Point in GrapheneSep 16 2011We investigate the vacancy effects on quasiparticle band structure of graphene near the Dirac point. It is found that each Dirac nodal point splits into two new nodal points due to the coherent scattering among vacancies. The splitting energy between ... More
Zero-Bias Anomalies in Narrow Tunnel Junctions in the Quantum Hall RegimeJun 15 2010Jan 28 2011We report on the study of cleaved-edge-overgrown line junctions with a serendipitously created narrow opening in an otherwise thin, precise line barrier. Two sets of zero-bias anomalies are observed with an enhanced conductance for filling factors $\nu ... More
Quantum Hall line junction with impurities as a multi-slit Luttinger liquid interferometerJul 23 2004Jan 28 2005We report on quantum interference between a pair of counterpropagating quantum Hall edge states that are separated by a high quality tunnel barrier. Observed Aharonov-Bohm oscillations are analyzed in terms of resonant tunneling between coupled Luttinger ... More
Fractional Quantum Hall Effect at $ν=1/2$ in Hole Systems Confined to GaAs Quantum WellsJan 29 2014We observe fractional quantum Hall effect (FQHE) at the even-denominator Landau level filling factor $\nu=1/2$ in two-dimensional hole systems confined to GaAs quantum wells of width 30 to 50 nm and having bilayer-like charge distributions. The $\nu=1/2$ ... More
Muon Identification with Muon Telescope Detector at the STAR ExperimentJan 02 2016Jul 15 2016Muon Telescope Detector (MTD) is a newly installed detector in the STAR experiment. It provides an excellent opportunity to study heavy quarkonium physics using the dimuon channel in heavy ion collisions. In this paper, we report the muon identification ... More
Exploring the quantum critical behaviour in a driven Tavis-Cummings circuitJun 05 2014May 25 2015Quantum phase transitions play an important role in many-body systems and have been a research focus in conventional condensed matter physics over the past few decades. Artificial atoms, such as superconducting qubits that can be individually manipulated, ... More
Parity breaking and scaling behavior in light-matter interactionNov 18 2012Mar 13 2013The light-matter interaction described by Rabi model and Jaynes-Cummings (JC) model is investigated by parity breaking as well as the scaling behavior of ground-state population-inversion expectation. We show that the parity breaking leads to different ... More
Determination of oxygen stoichiometry in the mixed-valent manganitesAug 13 2004Aug 27 2004The possible redox (oxidation reduction) chemical methods for precisely determining the oxygen content in the perovskite manganites including hole-doped La1-xCaxMnOy and electron-doped La1-xTexMnOy compounds are described. For manganites annealed at different ... More
Pressure Effect on the superconducting properties of LaO_{1-x}F_{x}FeAs(x=0.11) superconductorMar 29 2008Apr 25 2008Diamagnetic susceptibility measurements under high hydrostatic pressure (up to 1.03 GPa) were carried out on the newly discovered Fe-based superconductor LaO_{1-x}F_{x}FeAs(x=0.11). The transition temperature T_c, defined as the point at the maximum slope ... More
Coarse-graining renormalization by higher-order singular value decompositionJan 05 2012Aug 07 2012We propose a novel coarse graining tensor renormalization group method based on the higher-order singular value decomposition. This method provides an accurate but low computational cost technique for studying both classical and quantum lattice models ... More
The same superconducting criticality for underdoped and overdoped La_{2-x}Sr_xCuO_4 single crystalsMar 31 2000By measuring the superconducting diamagnetic moments for an underdoped and an overdoped La_{2-x}Sr_xCuO_4 single crystal with equal qualities and roughly equal transition temperatures, it is found that the underdoped sample has only one transition which ... More
Indirect driving of cavity QED system and its induced non-linearityMar 29 2014The linear driving for a single-mode optical field in a cavity can result from the external driving of classical field even when the coupling between the classical field and the cavity is weak. We revisit this well known effect with a microscopic model ... More
Electron Transport Properties of Atomic Carbon Nanowires between Graphene ElectrodesOct 21 2009Oct 31 2009Long, stable and free-standing linear atomic carbon wires have been carved out from graphene recently [Meyer et al: Nature (London) 2008, 454, 319; Jin et al: Phys: Rev: Lett: 2009, 102, 205501]. They can be considered as the extremely narrow graphene ... More
Parity Reversing Involutions on Plane Trees and 2-Motzkin PathsMar 15 2005The problem of counting plane trees with $n$ edges and an even or an odd number of leaves was studied by Eu, Liu and Yeh, in connection with an identity on coloring nets due to Stanley. This identity was also obtained by Bonin, Shapiro and Simion in their ... More
Cooling a Mechanical Resonator to Quantum Regime by heating itMar 18 2016Nov 04 2016We consider a mechanical resonator made of diamond, which contains a nitrogen-vacancy center (NV center) locating at the end of the oscillator. A second order magnetic gradient is applied and inducing coupling between mechanical modes and the NV center. ... More
Measurements of Grain Motion in a Dense, Three-Dimensional Granular FluidAug 15 2001Nov 29 2001We have used an NMR technique to measure the short-time, three-dimensional displacement of grains in a system of mustard seeds vibrated vertically at 15g. The technique averages over a time interval in which the grains move ballistically, giving a direct ... More
Superconductivity at 44 K in K intercalated FeSe system with excess FeMar 07 2012Feb 04 2013We report here that a new superconducting phase with much higher Tc has been found in K intercalated FeSe compound with excess Fe. We successfully grew crystals by precisely controlling the starting amount of Fe. Besides the superconducting (SC) transition ... More
Mechanism for quantum speedup in open quantum systemsFeb 25 2016The quantum speed limit (QSL) time for open system characterizes the most efficient response of the system to the environmental influences. Previous results showed that the non-Markovianity governs the quantum speedup. Via studying the dynamics of a dissipative ... More
Deterministically entangling distant nitrogen-vacancy centers by a nanomechanical cantileverJul 31 2009Aug 27 2009We present a practical scheme by global addressing to deterministically entangle negatively charged nitrogen-vacancy (N-V) centers in distant diamonds using a nano-mechanical cantilever with the magnetic tips strongly coupled to the N-V electron spins. ... More
Implementation of many-qubit Grover search by cavity QEDAug 21 2008Oct 07 2008We study the possibility of an implementation of N-qubit (N>3) Grover search in cavity QED, based on a fast operation of N-qubit controlled phase-flip with atoms in resonance with the cavity mode. We demonstrate both analytically and numerically that, ... More
Possible Superconductivity at 37 K in Graphite-Sulfur CompositeNov 23 2001Sulfur intercalated graphite composites with diamagnetic transitions at 6.7 K and 37 K are prepared. The magnetization hysteresis loops (MHL), Xray diffraction patterns, and resistance were measured. From the MHL, a slight superconducting like penetration ... More
High-fidelity quantum memory using nitrogen-vacancy center ensemble for hybrid quantum computationJun 15 2011We study a hybrid quantum computing system using nitrogen-vacancy center ensemble (NVE) as quantum memory, current-biased Josephson junction (CBJJ) superconducting qubit fabricated in a transmission line resonator (TLR) as quantum computing processor ... More
Testing quantum entanglement with local measurementOct 14 2011Apr 17 2012We propose to detect quantum entanglement by a condition of local measurments. We find that this condition can detect efficiently the pure entangled states for both discrete and continuous variable systems. It does not depend on interference of decoherence ... More
Structure-mining: screening structure models by automated fitting to the atomic pair distribution function over large numbers of modelsMay 07 2019Here we present a new approach to obtain candidate structures from atomic pair distribution function (PDF) data in a highly automated way. It pulls from modern structural databases all the structures meeting the experimenter's search criteria and performs ... More
Quantum corrections to the thermodynamics of Schwarzschild-Tangherlini black hole and the generalized uncertainty principleApr 16 2016Sep 17 2016We investigate the thermodynamics of the Schwarzschild-Tangherlini black hole in the context of the generalized uncertainty principle (GUP). The corrections to the Hawking temperature, entropy and the heat capacity are obtained via the modified Hamilton-Jacobi ... More
NMR Experiments on a Three-Dimensional Vibrofluidized Granular MediumMay 12 2003A three-dimensional granular system fluidized by vertical container vibrations was studied using pulsed field gradient (PFG) NMR coupled with one-dimensional magnetic resonance imaging (MRI). The system consisted of mustard seeds vibrated vertically at ... More
A Scanning Quantum Cryogenic Atom MicroscopeAug 24 2016Oct 19 2016Microscopic imaging of local magnetic fields provides a window into the organizing principles of complex and technologically relevant condensed matter materials. However, a wide variety of intriguing strongly correlated and topologically nontrivial materials ... More
Phase transition of light in circuit QED lattices coupled to nitrogen-vacancy centers in diamondApr 21 2015We propose a hybrid quantum architecture for engineering a photonicMott insulator-superfluid phase transition in a two-dimensional (2D) square lattice of a superconducting transmission line resonator (TLR) coupled to a single nitrogen-vacancy (NV) center ... More
Fractality of Hofstadter Butterfly in Specific Heat OscillationSep 29 2010We calculate thermodynamical properties of the Hofstadter model using a recently developed quantum transfer matrix method. We find intrinsic oscillation features in specific heat that manifest the fractal structure of the Hofstadter butterfly. We also ... More
Conduction mechanisms of epitaxial EuTiO3 thin filmsAug 28 2012To investigate leakage current density versus electric field characteristics, epitaxial EuTiO3 thin films were deposited on (001) SrTiO3 substrates by pulsed laser deposition and were post-annealed in a reducing atmosphere. This investigation found that ... More
Wigner solid pinning modes tuned by fractional quantum Hall states of a nearby layerOct 13 2018We study a bilayer system hosting exotic many-body states of two-dimensional electron systems (2DESs) in close proximity but isolated from one another by a thin barrier. One 2DES has low electron density and forms a Wigner solid (WS) at high magnetic ... More
Cyclotron Orbits of Composite Fermions in the Fractional Quantum Hall RegimeJan 07 2018We study a bilayer GaAs hole system that hosts two distinct many-body phases at low temperatures and high perpendicular magnetic fields. The higher-density (top) layer develops a Fermi sea of composite fermions (CFs) in its half-filled lowest Landau level, ... More
Cooling a Mechanical Resonator to Quantum Regime by heating itMar 18 2016Apr 18 2016We consider a mechanical resonator made of diamond, which contains a nitrogen-vacancy center (NV center) locating at the end of the oscillator. A second order magnetic gradient is applied and inducing coupling between mechanical modes and the NV center. ... More
Interface Spin-Orbit Coupling in a Non-centrosymmetric Thin-Film SuperconductorSep 14 2005Sep 19 2005We present a detailed study of the effects of interface spin-orbit coupling (ISOC) on the critical field behavior of non-centrosymmetric (NCS), ultra-thin superconducting Be/Au bilayers. Parallel field measurements were made in bilayers with Be thicknesses ... More
Beam Dynamics Simulation for the High Intensity DAEδALUS CyclotronsSep 26 2012In the DAE{\delta}ALUS (Decay-At-rest Experiment for {\delta}CP studies At the Laboratory for Underground Science) project, high power H+2 cyclotron chains are proposed to efficiently provide proton beams with a kinetic energy of 800 MeV and an average ... More
Relating Cascaded Random Forests to Deep Convolutional Neural Networks for Semantic SegmentationJul 27 2015Dec 22 2015We consider the task of pixel-wise semantic segmentation given a small set of labeled training images. Among two of the most popular techniques to address this task are Random Forests (RF) and Neural Networks (NN). The main contribution of this work is ... More
Selective oxidation-induced strengthening of Zr/Nb nanoscale multilayersSep 22 2016The paper presents a new approach, based on controlled oxidation of nanoscale metallic multilayers, to produce strong and hard oxide/metal nanocomposite coatings with high strength and good thermal stability. The approach is demonstrated by performing ... More
Entanglement of separate nitrogen-vacancy centers coupled to a whispering-gallery mode cavityOct 19 2010We present a quantum electrodynamical model involving nitrogen-vacancy centers coupled to a whispering-gallery mode cavity. Two schemes are considered to create W state and Bell state, respectively. One of the schemes makes use of the Raman transition ... More
Quantum speedup in a memory environmentNov 07 2013May 27 2014Memory (non-Markovian) effect is found to be able to accelerate quantum evolution [S. Deffner and E. Lutz, Phys. Rev. Lett. 111, 010402 (2013)]. In this work, for an atom in a structured reservoir, we show that the mechanism for the speedup is not only ... More
The Entanglement in Anisotropic Heisenberg XYZ Chain with inhomogeneous magnetic fieldFeb 04 2006Feb 10 2006The thermal entanglement of a two-qubit anisotropic Heisenberg $XYZ$ chain under an inhomogeneous magnetic field b is studied. It is shown that when inhomogeneity is increased to certain value, the entanglement can exhibit a larger revival than that of ... More
Probing the Hofstadter butterfly with the quantum oscillation of magnetizationAug 01 2008Jul 07 2015We have developed a different quantum transfer matrix method to accurately determine thermodynamic properties of the Hofstadter model. This method resolves a technical problem which is intractable by other methods and makes the calculation of physical ... More