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Electronic Properties, Screening and Efficient Carrier Transport in NaSbS2Jan 22 2017NaSbS2 is a semiconductor that was recently shown to have remarkable efficacy as a solar absorber indicating efficient charge collection even in defected material. We report first principles calculations of properties that show (1) an indirect gap only ... More

Entanglement between two fermionic atoms inside a cylindrical harmonic trapJan 18 2007We investigate quantum entanglement between two (spin-1/2) fermions inside a cylindrical harmonic trap, making use of the von Neumann entropy for the reduced single particle density matrix as the pure state entanglement measure. We explore the dependence ... More

Quantum decoherence effect and neutrino oscillationAug 15 1998In the view of the quantum dynamic theory of measurement developed from the Hepp-Colemen (HC) model (K. Hepp, Hev.Phys.Acta, {\bf 45}, 237 (1972)), the quantum decoherence in neutrino flavor oscillation caused by an environment surrounding neutrinos is ... More

A unified formulation of Gaussian vs. sparse stochastic processes - Part I: Continuous-domain theoryAug 31 2011Oct 05 2012We introduce a general distributional framework that results in a unifying description and characterization of a rich variety of continuous-time stochastic processes. The cornerstone of our approach is an innovation model that is driven by some generalized ... More

AOSO-LogitBoost: Adaptive One-Vs-One LogitBoost for Multi-Class ProblemOct 18 2011Jul 04 2012This paper presents an improvement to model learning when using multi-class LogitBoost for classification. Motivated by the statistical view, LogitBoost can be seen as additive tree regression. Two important factors in this setting are: 1) coupled classifier ... More

Operator fidelity susceptibility: an indicator of quantum criticalityMar 20 2008Mar 28 2008We introduce the operator fidelity and propose to use its susceptibility for characterizing the sensitivity of quantum systems to perturbations. Two typical models are addressed: one is the transverse Ising model exhibiting a quantum phase transition, ... More

Branches of the LandscapeJan 27 2005Jan 30 2005With respect to the question of supersymmetry breaking, there are three branches of the flux landscape. On one of these, if one requires small cosmological constant, supersymmetry breaking is predominantly at the fundamental scale; on another, the distribution ... More

Optical and Electronic Properties of Doped $p$-type CuI: Explanation of Transparent Conductivity from First PrinciplesMar 13 2018We report properties of the reported transparent conductor CuI, including the effect of heavy $p$-type doping. The results, based on first principles calculations, include analysis of the electronic structure and calculations of optical and dielectric ... More

A small X-ray corona of the narrow-angle tail radio galaxy NGC 1265 soaring through the Perseus clusterJan 24 2005Jul 14 2005A deep Chandra observation of NGC 1265 (3C 83.1B), the prototype for the narrow-angled-tailed (NAT) radio galaxy, reveals a small cool X-ray thermal corona (~ 0.6 keV) embedded in the hot ICM of the Perseus cluster (~ 6.7 keV). The corona is asymmetric ... More

The constant-pressure molecular dynamics for finite systems and its applicationsFeb 01 2008Recently we proposed a new constant-pressure molecular dynamics method for finite systems. In this paper, we discuss the current understanding of this method and its technique details. We also review the recent theoretical advances of nano-system under ... More

Analytic approach to the one-dimensional spin-Peierls system in the entire frequency rangeOct 31 2000We use the two cut-off renormalization group (RG) method to study the spin-Peierls model in one-dimension for the entire phonon frequency range. We integrate out the phonon and solve the effective Fermion system via mean field and RG methods. We make ... More

Time-Independent Measurements of D0-D0bar Mixing and Relative Strong Phases Using Quantum CorrelationsJul 20 2005Dec 14 2007Due to quantum correlations in the C=-1 and C=+1 D0 D0bar pairs produced in the reactions e+ e- --> D0 D0bar (n pi0) and e+ e- --> D0 D0bar gamma (n pi0), respectively, the time-integrated D0 D0bar decay rates are sensitive to interference between amplitudes ... More

A lossy transmission line as a quantum open system in the standard quantum limitJun 30 2004We systematically investigate how to quantize a transmission line resonator (TLR) in a mesoscopic electrical circuits in the presence of the resistance and the conductance of the dielectric media. Developed from the quantum bath based effective Hamiltonian ... More

A new constant-pressure molecular dynamics method for finite systemFeb 10 2001In this letter, by writing the volume as a function of coordinates of atoms, we present a new constant-pressure molecular dynamics method with parameters free. This method is specially appropriate for the finite system in which the periodic boundary condition ... More

Second order quantum decoherence in the boson systemApr 09 2001Apr 22 2001The second order quantum decoherence (SOQDC)is proposed as a novel description for the loss of quantum coherence only reflected by second order quantum correlations. By calculating the two-time correlation function, the phenomenon of SOQDC is studied ... More

Tracking continuous gravitational waves from a neutron star at once and twice the spin frequency with a hidden Markov modelMar 09 2019Searches for continuous gravitational waves from rapidly spinning neutron stars normally assume that the star rotates about one of its principal axes of moment of inertia, and hence the gravitational radiation emits only at twice the spin frequency of ... More

Holonomic Quantum Computation Using Rf-SQUIDs Coupled Through A Microwave CavityJul 09 2004Oct 23 2004We propose a new scheme to realize holonomic quantum computation with rf-SQUID qubits in a microwave cavity. In this scheme associated with the non-Abelian holonomies, the single-qubit gates and a two-qubit control-Phase gate as well as a control-NOT ... More

Quantum storage and information transfer with superconducting qubitsJun 17 2005We design theoretically a new device to realize the general quantum storage based on dcSQUID charge qubits. The distinct advantages of our scheme are analyzed in comparison with existing storage scenarios. More arrestingly, the controllable XY-model spin ... More

Graphite under uniaxial compression along c-axis: a new parameter relates out-of-plane strain to in-plane phonon frequencyFeb 15 2015Aug 27 2015Stacking graphene sheets forms graphite. Two in-plane vibrational modes of graphite, E1u and E2g(2), are derived from graphene E2g mode, the shifts of which under compression are all considered as results of in-plane bond shortening. Values of Gruneisen ... More

Anisotropic spin fluctuations and multiple superconducting gaps in hole-doped Ba_0.7K_0.3Fe_2As_2: NMR in a single crystalMar 29 2009Aug 18 2009We report the first ^{75}As-NMR study on a single crystal of the hole-doped iron-pnictide superconductor Ba_{0.7}K_{0.3}Fe_2As_{2} (T_c = 31.5 K). We find that the Fe antiferromagnetic spin fluctuations are anisotropic and are weaker compared to underdoped ... More

High order quantum decoherence via multi-particle amplitude for boson systemMay 24 2001In this paper we depict the high order quantum coherence of a boson system by using the multi-particle wave amplitude, whose norm square is just the high order correlation function. This multi-time amplitude can be shown to be a superposition of several ... More

Decoherence in a single trapped ion due to engineered reservoirApr 18 2000The decoherence in trapped ion induced by coupling the ion to the engineered reservoir is studied in this paper. The engineered reservoir is simulated by random variations in the trap frequency, and the trapped ion is treated as a two-level system driven ... More

Understanding destruction of nth-order quantum coherence in terms of multi-path interferenceMar 18 2002The classic example of the destruction of interference fringes in a ``which-way'' experiment, caused by an environmental interaction, may be viewed as the destruction of first-order coherence as defined by Glauber many years ago (Glauber). However, the ... More

Transformable topological mechanical metamaterialsOct 21 2015Mechanical metamaterials are engineered materials that gain their remarkable mechanical properties, such as negative Poisson's ratios, negative compressibility, phononic bandgaps, and topological phonon modes, from their structure rather than composition. ... More

Sequence-specific polyampholyte phase separation in membraneless organellesMay 29 2016Sep 21 2016Liquid-liquid phase separation of charge/aromatic-enriched intrinsically disordered proteins (IDPs) is critical in the biological function of membraneless organelles. Much of the physics of this recent discovery remains to be elucidated. Here we present ... More

Ferromagnetic resonance study of polycrystalline Fe_{1-x}V_x alloy thin filmsOct 15 2007Oct 17 2007Ferromagnetic resonance has been used to study the magnetic properties and magnetization dynamics of polycrystalline Fe$_{1-x}$V$_{x}$ alloy films with $0\leq x < 0.7$. Films were produced by co-sputtering from separate Fe and V targets, leading to a ... More

Sparse Coding with Fast Image Alignment via Large Displacement Optical FlowDec 21 2015Sparse representation-based classifiers have shown outstanding accuracy and robustness in image classification tasks even with the presence of intense noise and occlusion. However, it has been discovered that the performance degrades significantly either ... More

Task-Driven Dictionary Learning for Hyperspectral Image Classification with Structured Sparsity ConstraintsFeb 03 2015Sparse representation models a signal as a linear combination of a small number of dictionary atoms. As a generative model, it requires the dictionary to be highly redundant in order to ensure both a stable high sparsity level and a low reconstruction ... More

A dimension-breaking phenomenon for water waves with weak surface tensionNov 10 2014Sep 08 2016It is well known that the water-wave problem with weak surface tension has small-amplitude line solitary-wave solutions which to leading order are described by the nonlinear Schr\"odinger equation. The present paper contains an existence theory for three-dimensional ... More

Probing Quantum Phase Transition in Macroscopic Qubit Array via circuit QED architectureMar 02 2006Jun 06 2006We demonstrate a universal physical mechanism to probe the macroscopic quantum phase transition based on circuit QED architecture. We found that, with certain parameters, the Josephson junction qubit array behaves as an antiferromagnetic Ising model in ... More

Trace-back Along Capsules and Its Application on Semantic SegmentationJan 09 2019In this paper, we propose a capsule-based neural network model to solve the semantic segmentation problem. By taking advantage of the extractable part-whole dependencies available in capsule layers, we derive the probabilities of the class labels for ... More

Communication-efficient sparse regression: a one-shot approachMar 14 2015Aug 11 2015We devise a one-shot approach to distributed sparse regression in the high-dimensional setting. The key idea is to average "debiased" or "desparsified" lasso estimators. We show the approach converges at the same rate as the lasso as long as the dataset ... More

Quantum teleportation using cluster statesApr 25 2003A protocol of quantum communication is proposed in terms of the multi-qubit quantum teleportation through cluster states (Phys. Rev. Lett. \textbf{86}, 910 (2001)). Extending the cluster state based quantum teleportation on the basic unit of three qubits ... More

Quantum computation based on d-level cluster statesApr 08 2003Jul 08 2003The concept of qudit (a d-level system) cluster state is proposed by generalizing the qubit cluster state (Phys. Rev. Lett. \textbf{86}, 910 (2001)) according to the finite dimensional representations of quantum plane algebra. We demonstrate their quantum ... More

A robust and accurate formulation of molecular and colloidal electrostaticsFeb 08 2019This paper presents a re-formulation of the boundary integral method (BIM) for the Debye-Huckel model of molecular and colloidal electrostatics that removes the mathematical singularities that have been accepted as an intrinsic part of the conventional ... More

Collective effects of multi-scatterer on coherent propagation of photon in a two dimensional networkDec 22 2012Jul 22 2013We study the collective phenomenon in the scattering of a single-photon by one or two layers of two-level atoms. By modeling the photon dispersion with a two-dimensional (2D) coupled cavity array, we analytically derive the scattering probability of a ... More

Existence and conditional energetic stability of three-dimensional fully localised solitary gravity-capillary water wavesAug 09 2011In this paper we show that the hydrodynamic problem for three-dimensional water waves with strong surface-tension effects admits a fully localised solitary wave which decays to the undisturbed state of the water in every horizontal direction. The proof ... More

Adding One Neuron Can Eliminate All Bad Local MinimaMay 22 2018One of the main difficulties in analyzing neural networks is the non-convexity of the loss function which may have many bad local minima. In this paper, we study the landscape of neural networks for binary classification tasks. Under mild assumptions, ... More

Density-Dependent Synthetic Gauge Fields Using Periodically Modulated InteractionsNov 13 2013Nov 19 2014We show that density-dependent synthetic gauge fields may be engineered by combining periodically modu- lated interactions and Raman-assisted hopping in spin-dependent optical lattices. These fields lead to a density- dependent shift of the momentum distribution, ... More

Adiabatic amplification of plasmons and demons in 2D systemsJan 12 2016Aug 09 2016We theoretically investigate charged collective modes in a two-dimensional conductor with hot electrons where the instantaneous mode frequencies gradually increase or decrease with time. We show that the loss compensation or even amplification of the ... More

On a hierarchical control strategy for multi-agent formation without reflectionAug 01 2018This paper considers a formation shape control problem for point agents in a two-dimensional ambient space, where the control is distributed, is based on achieving desired distances between nominated agent pairs, and avoids the possibility of reflection ... More

Theory of Optically-Driven Sideband Cooling for Atomic Collective Excitations and Its GeneralizationJun 04 2009We explore how to cool atomic collective excitations in an optically-driven three-level atomic ensemble, which may be described by a model of coupled two harmonic oscillators (HOs) with a time-dependent coupling. Moreover, the coupled two-HO model is ... More

Fractional quantum Hall effect in the absence of Landau levelsFeb 14 2011It has been well-known that topological phenomena with fractional excitations, i.e., the fractional quantum Hall effect (FQHE) \cite{Tsui1982} will emerge when electrons move in Landau levels. In this letter, we report the discovery of the FQHE in the ... More

The structure of Lennard-Jones nanowires encapsulated by carbon nanotubesSep 18 2012Oct 06 2012Molecular dynamics simulations have been used to investigate the structures of Lennard-Jones (LJ) nanowires (NWs) encapsulated by carbon nanotubes (CNTs). We found that, when the radius of CNTs is small, the structures of NWs are quite simple, {\it i.e,} ... More

Non-singular boundary integral methods for fluid mechanics applicationsFeb 09 2019A formulation of the boundary integral method for solving partial differential equations has been developed whereby the usual weakly singular integral and the Cauchy principal value integral can be removed analytically. The broad applicability of the ... More

Coherent excitation transferring via dark state in light-harvesting processFeb 04 2011Feb 15 2011We study the light absorption and energy transferring in a donor-acceptor system with a bionic structure. In the optimal case with uniform couplings, it is found that the quantum dynamics of this seemingly complicated system is reduced as a three-level ... More

Differential emission measure Analysis of a limb solar flare on 2012 July 19Mar 25 2014Mar 27 2014We perform Differential Emission Measure (DEM) analysis of an M7.7 flare that occurred on 2012 July 19 and was well observed by the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamic Observatory. Using the observational data with unprecedented ... More

Kernel Approximation on Manifolds II: The $L_{\infty}$-norm of the $L_2$-projectorMay 13 2010Dec 16 2010This article addresses two topics of significant mathematical and practical interest in the theory of kernel approximation: the existence of local and stable bases and the L_p--boundedness of the least squares operator. The latter is an analogue of the ... More

The Thermal Composite Supernova Remnant Kes 27 as Viewed by CHANDRA: Shock Reflection from a Cavity WallNov 04 2007Feb 13 2008We present a spatially resolved spectroscopic study of the thermal composite supernova remnant Kes 27 with Chandra. The X-ray spectrum of Kes 27 is characterized by K lines from Mg, Si, S, Ar, and Ca. The X-ray emitting gas is found to be enriched in ... More

Quantum Critical Dynamics of A Qubit Coupled to An Isotropic Lipkin-Meshkov-Glick BathFeb 28 2007We explore a dynamic signature of quantum phase transition (QPT) in an isotropic Lipkin-Meshkov-Glick (LMG) model by studying the time evolution of a central qubit coupled to it. We evaluate exactly the time-dependent purity, which can be used to measure ... More

Quantum criticality in a generalized Dicke modelApr 13 2006Oct 01 2007We employ a generalized Dicke model to study theoretically the quantum criticality of an extended two-level atomic ensemble interacting with a single-mode quantized light field. Effective Hamiltonians are derived and diagonalized to investigate numerically ... More

Two-Qubits Entanglement Induced by a Faster Data BusJan 11 2004We propose a theoretical protocol to create the entanglement of two qubits via the Born-Oppenheimer (BO) approximation. In our scheme, each qubit is coupled to a faster data bus whose frequency is much larger than the energy spacing of the qubits and ... More

Superradiant quantum phase transition in a circuit QED system: a revisit from a fully microscopic point of viewApr 12 2012In order to examine whether or not the quantum phase transition of Dicke type exists in realistic systems, we revisit the model setup of the superconducting circuit QED from a microscopic many-body perspective based on the BCS theory with pseudo-spin ... More

Magnetization DynamicsOct 10 2018Magnetism primarily describes the physics and materials science of systems presenting a magnetization -- a macroscopic order parameter characterizing electron angular momentum. The order parameter is associated with the electronic exchange interactions, ... More

Mosaic spin models with topological orderAug 06 2007Nov 02 2007We study a class of two-dimensional spin models with the Kitaev-type couplings in mosaic structure lattices to implement topological orders. We show that they are exactly solvable by reducing them to some free Majorana fermion models with gauge symmetries. ... More

Quantum theory for spatial motion of polaritons in inhomogeneous fieldsJun 23 2007Feb 18 2008Polaritons are the collective excitations of many atoms dressed by resonant photons, which can be used to explain the slow light propagation with the mechanism of electromagnetically induced transparency. As quasi-particles, these collective excitations ... More

Quantum Maxwell's Demon in Thermodynamic CyclesSep 14 2010We study the physical mechanism of Maxwell's Demon (MD) helping to do extra work in thermodynamic cycles, by describing measurement of position, insertion of wall and information erasing of MD in a quantum mechanical fashion. The heat engine is exemplified ... More

Courteous Autonomous CarsAug 08 2018Aug 16 2018Typically, autonomous cars optimize for a combination of safety, efficiency, and driving quality. But as we get better at this optimization, we start seeing behavior go from too conservative to too aggressive. The car's behavior exposes the incentives ... More

Idealization Second Quantization of Composite ParticlesDec 16 2000A practical method is developed to deal with the second quantization of the many-body system containing the composite particles. In our treatment, the modes associated with composite particles are regarded approximately as independent ones compared with ... More

On bubble clustering and energy spectra in pseudo-turbulenceDec 08 20093D-Particle Tracking (3D-PTV) and Phase Sensitive Constant Temperature Anemometry in pseudo-turbulence--i.e., flow solely driven by rising bubbles-- were performed to investigate bubble clustering and to obtain the mean bubble rise velocity, distributions ... More

Non-filamentary memristive switching in Pt/CuOx/Si/Pt systemsApr 15 2013We report a memristive switching effect in the Pt/CuOx/Si/Pt devices prepared by rf sputtering technique at room temperature. Different from other Cu-based switching systems, the devices show a non-filamentary switching effect. A gradual electroforming ... More

Transport properties and the anisotropy of Ba_{1-x}K_xFe_2As_2 single crystals in normal and superconducting statesJul 15 2009The transport and superconducting properties of Ba_{1-x}K_xFe_2As_2 single crystals with T_c = 31 K were studied. Both in-plane and out-of plane resistivity was measured by modified Montgomery method. The in-plane resistivity for all studied samples, ... More

Modeling Magnetic Field Structure of a Solar Active Region Corona using Nonlinear Force-Free Fields in Spherical GeometryOct 03 2012We test a nonlinear force-free field (NLFFF) optimization code in spherical geometry using an analytical solution from Low and Lou. Several tests are run, ranging from idealized cases where exact vector field data are provided on all boundaries, to cases ... More

Investigating Two Successive Flux Rope Eruptions In A Solar Active RegionApr 28 2013We investigate two successive flux rope (FR1 and FR2) eruptions resulting in two coronal mass ejections (CMEs) on 2012 January 23. Both FRs appeared as an EUV channel structure in the images of high temperature passbands of the Atmospheric Imaging Assembly ... More

Interplay between grain boundary grooving, stress, and dealloying in the agglomeration of NiSi1-xGex filmsMay 18 2006Germanosilicides, especially those formed on compressive substrates, are less stable than silicides against agglomeration. By studying the solid-state reaction of Ni thin film on strained Si0.8Ge0.2(001), we show that nickel germanosilicide is different ... More

Sphere theorems for submanifolds in Kähler ManifoldOct 17 2018In this paper, we prove some differentiable sphere theorems and topological sphere theorems for submanifolds in K\"ahler manifold, especially in complex space forms.

SPLZ: An Efficient Algorithm for Single Source Shortest Path Problem Using Compression MethodAug 11 2014Jan 11 2015Efficient solution of the single source shortest path (SSSP) problem on road networks is an important requirement for numerous real-world applications. This paper introduces an algorithm for the SSSP problem using compression method. Owning to precomputing ... More

Sphere theorems for Lagrangian and Legendrian submanifoldsOct 22 2018In this paper, we prove some differentiable sphere theorems and topological sphere theorems for Lagrangian submanifolds in K\"ahler manifold and Legendrian submanifolds in Sasaki space form.

One-dimensional spin-1/2 Heisenberg antiferromagnet in a weak external magnetic fieldFeb 07 2000The one dimensional spin-1/2 Heisenberg antiferromagnet in a weak magnetic field h is studied using the bosonization method. We derive a set of renormalization group equations. The fixed point is reached when the field is scaled to the value at which ... More

A unified framework for heat and mass transport at the atomic scaleJan 17 2018Feb 07 2018We present a unified framework to simulate heat and mass transport in systems of particles. The proposed framework is based on kinematic mean field theory and uses a phenomenological master equation to compute effective transport rates between particles ... More

Local Coarse-grained Approximation to Path Integral Monte Carlo Integration for Fermion SystemsAug 18 2008May 08 2009An approximate treatment of exchange in finite-temperature path integral Monte Carlo simulations for fermions has been proposed. In this method, some of the fine details of density matrix due to permutations have been smoothed over or averaged out by ... More

Distributed stabilization control of rigid formations with prescribed orientationJun 10 2016Most rigid formation controllers reported in the literature aim to only stabilize a rigid formation shape, while the formation orientation is not controlled. This paper studies the problem of controlling rigid formations with prescribed orientations in ... More

Quantification of SymmetryJan 14 2016Symmetry is conventionally described in a contrariety manner that the system is either completely symmetric or completely asymmetric. Using group theoretical approach to overcome this dichotomous problem, we introduce the degree of symmetry (DoS) as a ... More

Random-phase-approximation theory for sequence-dependent, biologically functional liquid-liquid phase separation of intrinsically disordered proteinsSep 26 2016Intrinsically disordered proteins (IDPs) are typically low in nonpolar/hydrophobic but relatively high in polar, charged, and aromatic amino acid compositions. Some IDPs undergo liquid-liquid phase separation in the aqueous milieu of the living cell. ... More

Charge Pattern Matching as a "Fuzzy" Mode of Molecular Recognition for the Functional Phase Separations of Intrinsically Disordered ProteinsJul 27 2017Oct 20 2017Biologically functional liquid-liquid phase separation of intrinsically disordered proteins (IDPs) is driven by interactions encoded by their amino acid sequences. Little is currently known about the molecular recognition mechanisms for distributing different ... More

Prediction of superconductivity of $3d$ transition-metal based antiperovskites via magnetic phase diagramNov 18 2013Nov 22 2013We theoretically studied the electronic structure, magnetic properties, and lattice dynamics of a series of $3d$ transition-metal antiperovskite compounds AXM$_{3}$ by density function theory. Based on the Stoner criterion, we drew the magnetic phase ... More

The large unsaturated magnetoresistance of Weyl semimetalsSep 14 2015Sep 15 2015The Weyl semimetal (WSM) is a novel topological gapless state with promises exotic transport due to chiral anomaly. Recently, a family of nonmagnetic WSM candidates including TaAs, NbAs, NbP etc is confirmed by first principle calculation and experiments. ... More

A Homogeneous Sample of Sub-DLAs IV: Global Metallicity EvolutionJul 18 2007An accurate method to measure the abundance of high-redshift galaxies consists in the observation of absorbers along the line of sight toward a background quasar. Here, we present abundance measurements of 13 z>3 sub-Damped Lyman-alpha Systems (quasar ... More

Macroscopic Quantum Criticality in a Circuit QEDJan 04 2006Cavity quantum electrodynamic (QED) is studied for two strongly-coupled charge qubits interacting with a single-mode quantized field, which is provided by a on-chip transmission line resonator. We analyze the dressed state structure of this superconducting ... More

Cooperative event-based rigid formation controlJan 11 2019This paper discusses cooperative stabilization control of rigid formations via an event-based approach. We first design a centralized event-based formation control system, in which a central event controller determines the next triggering time and broadcasts ... More

Measurements of a fast nuclear spin dynamics in a single InAs quantum dot with positively charged excitonJan 05 2012By using highly time-resolved spectroscopy with an alternative {\sigma}+/{\sigma} - laser pulse modulation technique, we are able to measure the fast buildup and decay times of the dynamical nuclear spin polarization (DNSP) at 5 K for a single InAs quantum ... More

Broad-band chopper for a CW proton linac at FermilabAug 13 2012Requirements and technical limitations to the bunch-by-bunch chopper for the Fermilab Project X are discussed.

Intrinsic features of an ideal glassJan 22 2017In order to understand the long-standing problem of the nature of glass states, we performed intensive simulations on the thermodynamic properties and potential energy surface of an ideal glass. We found that the atoms of an ideal glass manifest cooperative ... More

A New Method for Characterizing Bulk and Surface Conductivities of Three-Dimensional Topological Insulators: Inverted Resistance MeasurementsAug 18 2017Oct 25 2017We introduce a new resistance measurement method that is useful in characterizing materials with both surface and bulk conduction, such as three-dimensional topological insulators. The transport geometry for this new resistance measurement configuration ... More

Infrared Optical Properties of Ferropericlase (Mg1-xFexO): Experiment and TheoryApr 18 2007The temperature dependence of the reflectance spectra of magnesium oxide (MgO) and ferropericlase (Mg1-xFexO, for x=0.06 and x=0.27) have been measured over a wide frequency range (~50 to 32000 cm-1) at 295 and 6 K. The complex dielectric function has ... More

Dynamics of coherence, localization and excitation transfer in disordered nanoringsJul 05 2017Self-assembled supramolecular aggregates are excellent candidates for the design of efficient excitation transport devices. Both artificially prepared and natural photosynthetic aggregates in plants and bacteria present an important degree of disorder ... More

Peak Effect of Flux Pinning in Sc5Ir4Si10 SuperconductorsOct 15 2010Magnetic hysteresis loops (MHLs) have been comparatively measured on both textured and single crystalline Sc5Ir4Si10 superconductors. Critical current densities and flux pinning forces are calculated from MHLs by Bean model. Three kinds of peaks of the ... More

Quantization effects and convergence properties of rigid formation control systems with quantized distance measurementsAug 13 2018In this paper, we discuss quantization effects in rigid formation control systems when target formations are described by inter-agent distances. Because of practical sensing and measurement constraints, we consider in this paper distance measurements ... More

Single-photon scattering on a strongly dressed atomDec 07 2011Dec 09 2011We develop the generalized rotating-wave approximation (GRWA) approach (Phys. Rev. Lett. 99, 173601 (2007)) to study the single-photon scattering on a two-level system (TLS) with arbitrarily strong coupling to a local mode in a one-dimensional (1D) coupled ... More

Eliminating the fictitious frequency problem in BEM solutions of the external Helmholtz equationFeb 01 2019The problem of the spurious frequency spectrum resulting from numerical implementations of the boundary element method for the exterior Helmholtz problem is revisited. When the ordinary 3D free space Green's function is replaced by a modified Green's ... More

Non-canonical statistics of finite quantum systemMar 21 2014The canonical statistics describes the statistical properties of an open system by assuming its coupling with the heat bath infinitesimal in comparison with the total energy in thermodynamic limit. In this paper, we generally derive a non-canonical distribution ... More

Approach to the semiconductor cavity QED in high-Q regimes with q-deformed bosonJan 19 2000The high density Frenkel exciton which interacts with a single mode microcavity field is dealed with in the framework of the q-deformed boson. It is shown that the q-defomation of bosonic commutation relations is satisfied naturally by the exciton operators ... More

Dynamics of bi-stripes and a colossal metal-insulator transition in the bi-layer manganite La$_{2-2x}$Sr$_{1+2x}$Mn$_{2}$O$_{7}$ (x~0.59)Oct 28 2009Oct 31 2009In correlated electron materials, electrons often self-organize and form a variety of patterns with potential ordering of charges, spins, and orbitals, which are believed to be closely connected to many novel properties of these materials including superconductivity, ... More

Exact Non-Markovian Master Equation and Dispersive Probing of Non-Markovian ProcessSep 25 2012Dec 04 2012For a bosonic (fermionic) open system in a bath with many bosons (fermions) modes, we derive the exact non-Markovian master equation in which the memory effect of the bath is reflected in the time dependent decay rates. In this approach, the reduced density ... More

Synthesis, Crystal Structure, Magnetic and Electronic Properties of the Caesium-based Transition Metal Halide Cs3Fe2Br9Oct 20 2017The diversity of halide materials related to important solar energy systems such as CsPbX3 (X = Cl, Br, I) is explored by introducing the transition metal element Fe. In particular a new compound, Cs3Fe2Br9 (space group P6_3/mmc with a = 7.5427(8) and ... More

Experimental quantum Zeno effect in NMR with entanglement-based measurementMar 11 2013We experimentally demonstrate a new dynamic fashion of quantum Zeno effect in nuclear magnetic resonance systems. The frequent measurements are implemented through quantum entanglement between the target qubit(s) and the measuring qubit, which dynamically ... More

A Type II Radio Burst without a Coronal Mass EjectionMar 03 2015Type II radio bursts are thought to be a signature of coronal shocks. In this paper, we analyze a short-lived type II burst that started at 07:40 UT on 2011 February 28. By carefully checking white-light images, we find that the type II radio burst is ... More

Observation of valley Landau-Zener-Bloch oscillations and pseudospin imbalance in photonic grapheneJul 12 2018We demonstrate inter-valley Bloch oscillation (BO) and Landau-Zener tunneling (LZT) in an optically-induced honeycomb lattice with a refractive index gradient. Unlike previously observed BO in a gapped square lattice, we show non-adiabatic beam dynamics ... More

Stokesian dynamics of pill-shaped Janus particles with stick and slip boundary conditionsFeb 11 2019We study the forces and torques experienced by pill-shaped Janus particles of different aspect ratios where half of the surface obeys the no-slip boundary condition and the other half obeys the Navier slip condition of varying slip lengths. Using a recently ... More

Boundary regularized integral equation formulation (BRIEF) of Stokes flowFeb 07 2019Single-phase Stokes flow problems with prescribed boundary conditions can be formulated in terms of a boundary regularized integral equation that is completely free of singularities that exist in the traditional formulation. The usual mathematical singularities ... More