Still searching Arxiv, refresh for possibly better results.

Results for "Zhen Xu"

total 18152took 0.12s
Construction and Field Theory of Bosonic Symmetry Protected Topological states beyond Group CohomologyJan 09 2015Apr 24 2015We construct a series of bosonic symmetry protected topological (BSPT) states beyond group cohomology classification using "decorated defects" approach. This construction is based on topological defects of ordinary Landau order parameters, decorated with ... More
Investigation of the high-spin rotational properties of the proton emitter $^{113}$Cs using a particle-number conserving methodAug 27 2016The recently observed two high-spin rotational bands in the proton emitter $^{113}$Cs are investigated using the cranked shell model with pairing correlations treated by a particle-number conserving method, in which the Pauli blocking effects are taken ... More
Independent determination of the systematic and random errors of the proper motions in the PPMXL catalog using quasarsOct 06 2011Using a sample of 117053 quasars identified in the PPMXL catalog, the systematic errors of the proper motions in the PPMXL catalog are estimated independently as -2.0 and -2.1 mas yr$^{-1}$ in $\mu_{\alpha}\cos\delta$ and $\mu_{\delta}$, respectively. ... More
Self-dual Quantum Electrodynamics on the boundary of 4d Bosonic Symmetry Protected Topological StatesApr 16 2015We study $3d$ (or $(3+1)d$) Quantum Electrodynamics (QED) realized on the boundary of $4d$ (or $(4+1)d$) bosonic symmetry protected topological (BSPT) states, using a systematic nonlinear sigma model (NLSM) field theory description of BSPT states. We ... More
Line defects in Three dimensional Symmetry Protected Topological PhasesApr 26 2013A 3d symmetry protected topological phase, by definition must have symmetry protected nontrivial boundary states, namely its 2d boundary must be either gapless or degenerate. In this work we demonstrate that once we couple a 3d SPT phase to a lattice ... More
On restricted edge-connectivity of replacement product graphsDec 28 2015Jul 03 2016This paper considers the edge-connectivity and restricted edge-connectivity of replacement product graphs, gives some bounds on edge-connectivity and restricted edge-connectivity of replacement product graphs and determines the exact values for some special ... More
The productions of the top-pions and top-Higgs associated with the charm quark at the hadron collidersJan 29 2007In the topcolor-assistant technicolor (TC2) model, the typical physical particles, top-pions and top-Higgs, are predicted and the existence of these particles could be regarded as the robust evidence of the model. These particles are accessible at the ... More
Lieb-Schultz-Mattis Theorem and its generalizations from the Perspective of the Symmetry Protected Topological phaseApr 28 2017We ask whether a local Hamiltonian with a featureless (fully gapped and nondegenerate) ground state could exist in certain quantum spin systems. We address this question by mapping the vicinity of certain quantum critical point (or gapless phase) of the ... More
"Self-Dual" Quantum Critical Point on the surface of $3d$ Topological InsulatorDec 04 2015Jul 25 2016In the last few years a lot of exotic and anomalous topological phases were constructed by proliferating the vortex like topological defects on the surface of the $3d$ topological insulator (TI). In this work, rather than considering topological phases ... More
Vulnerability of super edge-connected graphsJan 20 2013A subset $F$ of edges in a connected graph $G$ is a $h$-extra edge-cut if $G-F$ is disconnected and every component has more than $h$ vertices. The $h$-extra edge-connectivity $\la^{(h)}(G)$ of $G$ is defined as the minimum cardinality over all $h$-extra ... More
Prediction of Brain States of Concentration and Relaxation in Real Time with Portable ElectroencephalographsSep 25 2015In our research, we attempt to help people recognize their brain state of concentration or relaxation more conveniently and in real time. Considering the inconvenience of wearing traditional multiple electrode electroencephalographs, we choose Muse to ... More
Temperature dependence of cross sections for meson-meson nonresonant reactions in hadronic matterMay 21 2014We study unpolarized cross sections for the endothermic nonresonant reactions: pion pion to rho rho for I=2, KK to K*K* for I=1, KK* to K*K* for I=1, pion K to rho K* for I=3/2, pion K* to rho K* for I=3/2, rho K to rho K* for I=3/2, and pion K* to rho ... More
Recognition of Brain Waves of Left and Right Hand Movement Imagery with Portable ElectroencephalographsSep 28 2015With the development of the modern society, mind control applied to both the recovery of disabled individuals and auxiliary control of normal people has obtained great attention in numerous researches. In our research, we attempt to recognize the brain ... More
Suggestion of the DLV dimensionless number system to represent the scaled behavior of structures under impact loadsMar 21 2019Apr 04 2019A group of dimensionless numbers, termed DLV (Density-Length-Velocity) system, is put forward to represent the scaled behavior of structures under impact loads. It is obtained by means of the Buckingham Pi theorem with an alternative basis. The distinct ... More
A model for continuous thermal Metal to Insulator TransitionMar 22 2017We propose a $d-$dimensional interacting Majorana fermion model with quenched disorder, which gives us a continuous quantum phase transition between a diffusive thermal metal phase with a finite entropy density to an insulator phase with zero entropy ... More
Anyon and Loop Braiding Statistics in Field Theories with a Topological $Θ-$termJul 11 2014We demonstrate that the anyon statistics and three-loop statistics of various 2d and 3d topological phases can be derived using semiclassical nonlinear Sigma model field theories with a topological $\Theta$-term. In our formalism, the braiding statistics ... More
Using Social Dynamics to Make Individual Predictions: Variational Inference with a Stochastic Kinetic ModelNov 07 2016Social dynamics is concerned primarily with interactions among individuals and the resulting group behaviors, modeling the temporal evolution of social systems via the interactions of individuals within these systems. In particular, the availability of ... More
Fulde-Ferrell superfluids in spinless ultracold Fermi gasesMay 09 2017Jun 06 2018The Fulde-Ferrell (FF) superfluid phase, in which fermions form finite-momentum Cooper pairings, is well studied in spin-singlet superfluids in past decades. Different from previous works that engineer the FF state in spinful cold atoms, we show that ... More
Study of $CP$ Violations in $B^-\rightarrow K^- π^+π^-$ and $B^-\rightarrow K^- f_0(500)$ decays in the QCD factorization approachMay 24 2018Within the QCD factorization approach, we study the $CP$ violations in $B^-\rightarrow K^-\pi^+\pi^-$ and $B^-\rightarrow K^- f_0(500)$ decays. We find the experimental data of the localized $CP$ asymmetry in $B^-\rightarrow K^-\pi^+\pi^-$ decays in the ... More
Incorporating Loose-Structured Knowledge into LSTM with Recall Gate for Conversation ModelingMay 17 2016Modeling human conversations is the essence for building satisfying chat-bots with multi-turn dialog ability. Conversation modeling will notably benefit from domain knowledge since the relationships between sentences can be clarified due to semantic hints ... More
Synthetic topological Kondo insulator in a pumped optical cavityFeb 26 2018Motivated by experimental advances on ultracold atoms coupled to a pumped optical cavity, we propose a scheme for synthesizing and observing the Kondo insulator in Fermi gases trapped in optical lattices. The synthetic Kondo phase arises from the screening ... More
Temperature-dependent cross sections for charmonium dissociation in collisions with kaons and eta mesons in hadronic matterJul 15 2015We study kaon-charmonium and eta-charmonium dissociation reactions. The K-charmonium dissociation and the eta-charmonium dissociation include 27 reactions. Cross sections for the reactions are calculated in the Born approximation, in the quark-interchange ... More
Quantum Phase Transitions Between Bosonic Symmetry Protected Topological States Without Sign Problem: Nonlinear Sigma Model with a Topological TermOct 14 2015Feb 26 2016We propose a series of simple $2d$ lattice interacting fermion models that we demonstrate at low energy describe bosonic symmetry protected topological (SPT) states and quantum phase transitions between them. This is because due to interaction the fermions ... More
Stable Interacting (2 + 1)d Conformal Field Theories at the Boundary of a class of (3 + 1)d Symmetry Protected Topological PhasesMay 17 2016May 30 2016Motivated by recent studies of symmetry protected topological (SPT) phases, we explore the possible gapless quantum disordered phases in the $(2+1)d$ nonlinear sigma model defined on the Grassmannian manifold $\frac{U(N)}{U(n)\times U(N - n)}$ with a ... More
Context-Dependent Diffusion Network for Visual Relationship DetectionSep 11 2018Visual relationship detection can bridge the gap between computer vision and natural language for scene understanding of images. Different from pure object recognition tasks, the relation triplets of subject-predicate-object lie on an extreme diversity ... More
Observation of Negative Magnetoresistance and nontrivial $π$ Berrys phase in 3D Weyl semi-metal NbAsJun 07 2015We report the electric transport properties of NbAs, which is a Weyl semimetal candidate proposed by recent theoretical calculations and confirmed by recent angle-resolved photoemission spectroscopy (ARPES) data. We detected the long-anticipated negative ... More
Learning Adaptive Discriminative Correlation Filters via Temporal Consistency Preserving Spatial Feature Selection for Robust Visual TrackingJul 30 2018With efficient appearance learning models, Discriminative Correlation Filter (DCF) has been proven to be very successful in recent video object tracking benchmarks and competitions. However, the existing DCF paradigm suffers from two major problems, \ie ... More
Orbits of nearby planetary nebulae and their interaction with the interstellar mediumFeb 07 2011Feb 21 2011We present and analyze the orbits of eight nearby planetary nebulae (PNs) using two different Galactic models. The errors of the derived orbital parameters are determined with a Monte Carlo method. Based on the derived orbital parameters, we find that ... More
Non-Markovian effect on remote state preparationOct 07 2013Mar 17 2015Memory effect of non-Markovian dynamics in open quantum systems is often believed to be beneficial for quantum information processing. In this work, we employ an experimentally controllable two-photon open system, with one photon experiencing a dephasing ... More
MOSFET Characterization and Modeling at Cryogenic TemperaturesNov 25 2018Cryogenic CMOS technology (cryo-CMOS) offers a scalable solution for quantum device interface fabrication. Several previous works have studied the characterization of CMOS technology at cryogenic temperatures for various process nodes. However, CMOS characteristics ... More
Improving Neural Machine Translation with Conditional Sequence Generative Adversarial NetsMar 15 2017Apr 08 2018This paper proposes an approach for applying GANs to NMT. We build a conditional sequence generative adversarial net which comprises of two adversarial sub models, a generator and a discriminator. The generator aims to generate sentences which are hard ... More
The orbits of open clusters in the GalaxySep 21 2009We present and analyze kinematics and orbits for a sample of 488 open clusters in the Galaxy. The velocity ellipsoid for our present sample is derived as ($\sigma_{U}$, $\sigma_{V}$, $\sigma_{W})$=$(28.7$, 15.8, 11.0) km s$^{-1}$ which represents a young ... More
Out-of-Time-Order Correlation in Marginal Many-Body Localized SystemsNov 13 2016Apr 22 2017We show that the out-of-time-order correlation (OTOC) $ \langle W(t)^\dagger V(0)^\dagger W(t)V(0)\rangle$ in many-body localized (MBL) and marginal MBL systems can be efficiently calculated by the spectrum bifurcation renormalization group (SBRG). We ... More
Many-Body Localization of Symmetry Protected Topological StatesMay 19 2015May 31 2015We address the following question: Which kinds of symmetry protected topological (SPT) Hamiltonians can be many-body localized? That is, which Hamiltonians with an SPT ground state have finite energy density excited states which are all localized by disorder? ... More
A Note on "Quantum Algorithm for Linear Systems of Equations"Feb 20 2018Recently, an efficient quantum algorithm for linear systems of equations introduced by Harrow, Hassidim, and Lloyd, has received great concern from the academic community. However, the error and complexity analysis for this algorithm seems so complicated ... More
Unsupervised Neural Machine Translation with Weight SharingApr 24 2018Unsupervised neural machine translation (NMT) is a recently proposed approach for machine translation which aims to train the model without using any labeled data. The models proposed for unsupervised NMT often use only one shared encoder to map the pairs ... More
Finite-size effects in non-Hermitian topological systemsJan 21 2019Apr 17 2019We systematically investigate the finite-size effects in non-Hermitian one-dimensional (1D) Su-Schrieffer-Heeger (SSH) and two-dimensional (2D) Chern insulator models. Using a combination of analytical and numerical calculations, we show that the non-Hermitian ... More
Classification and Description of Bosonic Symmetry Protected Topological Phases with semiclassical Nonlinear Sigma modelsSep 02 2013Feb 19 2016In this paper we systematically classify and describe bosonic symmetry protected topological (SPT) phases in all physical spatial dimensions using semiclassical nonlinear Sigma model (NLSM) field theories. All the SPT phases on a $d-$dimensional lattice ... More
Tunable band-notched line-defect waveguide in a surface-wave photonic crystalJun 24 2016We propose and experimentally demonstrate a tunable band-notched line-defect waveguide in a surface-wave photonic crystal, which consists of a straight line-defect waveguide and side-coupled defect cavities. A tunable narrow stopband can be observed in ... More
Incorporating Loose-Structured Knowledge into Conversation Modeling via Recall-Gate LSTMMay 17 2016Feb 06 2017Modeling human conversations is the essence for building satisfying chat-bots with multi-turn dialog ability. Conversation modeling will notably benefit from domain knowledge since the relationships between sentences can be clarified due to semantic hints ... More
Accurate De Novo Prediction of Protein Contact Map by Ultra-Deep Learning ModelSep 02 2016Nov 27 2016Recently exciting progress has been made on protein contact prediction, but the predicted contacts for proteins without many sequence homologs is still of low quality and not very useful for de novo structure prediction. This paper presents a new deep ... More
Gaussian-Induced Convolution for GraphsNov 11 2018Learning representation on graph plays a crucial role in numerous tasks of pattern recognition. Different from grid-shaped images/videos, on which local convolution kernels can be lattices, however, graphs are fully coordinate-free on vertices and edges. ... More
Walk-Steered Convolution for Graph ClassificationApr 16 2018Graph classification is a fundamental but challenging problem due to the non-Euclidean property of graph. In this work, we jointly leverage the powerful representation ability of random walk and the essential success of standard convolutional network ... More
Spatio-Temporal Graph Convolution for Skeleton Based Action RecognitionFeb 27 2018Variations of human body skeletons may be considered as dynamic graphs, which are generic data representation for numerous real-world applications. In this paper, we propose a spatio-temporal graph convolution (STGC) approach for assembling the successes ... More
Early thermalization of quark-gluon matter with the elastic scattering of ggq and ggqbarMay 22 2013Elastic gluon-gluon-quark (gluon-gluon-antiquark) scattering is studied in perturbative QCD with 123 Feynman diagrams at the tree level. Individually squared amplitudes and interference terms of the Feynman diagrams are derived. With the elastic gluon-gluon-quark ... More
The loop effects on the chargino decays $\tildeχ_1^\pm\to \tildeχ_1^0 f f^\prime$ in the MSSMOct 21 2013Dec 08 2013The lighter chargino three body decays $\tilde{\chi}_1^\pm\to \tilde{\chi}_1^0 f f^\prime$ via the $W^\pm$ boson and the charged Higgs boson $H^\pm$ are studied in the R-parity conserved Minimal Supersymmetric Standard Model (MSSM). We treat $\tilde \chi_1^\pm$ ... More
Radial Velocity Retrieval for Multichannel SAR Moving Targets with Time-Space Doppler De-ambiguityOct 01 2016Jun 09 2017In this paper, with respect to multichannel synthetic aperture radars (SAR), we first formulate the problems of Doppler ambiguities on the radial velocity (RV) estimation of a ground moving target in range-compressed domain, range-Doppler domain and image ... More
BATC 13-band Photometry of Open Cluster NGC 7789Jan 10 2007We present 13-band CCD intermediate-band spectrophotometry of a field centered on the open cluster NGC 7789 from 400 to nearly 1000 nm, taken with Beijing-Arizona-Taiwan-Connecticut (BATC) Multi-Color Survey photometric system. By comparing observed spectral ... More
Membership Determination of Open Cluster M48 Based on BATC Thirteen-Band PhotometryJul 24 2006Beijing-Arizona-Taiwan-Connecticut (BATC) multi-band photometric data in the field of open cluster M48 are used to determine its membership. By comparing observed spectral energy distributions (SEDs) of stars with theoretical ones, membership probabilities ... More
13 Color Photometry of Open Cluster M48Nov 26 2004This paper presents 13 color CCD intermediate-band spectrophotometry of a field centered on the open cluster M48 (NGC 2548), from 400nm to nearly 1000nm, taken with Beijing-Arizona-Taiwan-Connecticut (BATC) Multi-Color Survey Photometric system. The fundamental ... More
Role of the N*(1440) resonance in the pp->pnpi+ reactionAug 25 2008Feb 25 2009New measurement by CELSIUS-WASA Collaboration on the pp->pn pi+ reaction reveals clear evidence for the presence of the Roper resonance N*(1440) which has been ignored in previous theoretical calculations. In this article, based on an effective Lagrangian ... More
Anisotropic evolution of 4-brane in a 6D generalized Randall-Sundrum modelJun 11 2019We investigate a 6d generalized Randall-Sundrum brane world scenario with a bulk cosmological constant. It is shown that each stress-energy tensor $T_{ab}^{i}$ on the brane is similar to a constant vacuum energy. This is consistent with the Randall-Sundrum ... More
Generalized speed and cost rate in transitionless quantum drivingNov 16 2017Mar 18 2018Transitionless quantum driving, also known as counterdiabatic driving, is a unique shortcut technique to adiabaticity, enabling a fast-forward evolution to the same target quantum states as those in the adiabatic case. However, as nothing is free, the ... More
Quantum information processing architecture with endohedral fullerenes in a carbon nanotubeFeb 25 2010Mar 06 2010A potential quantum information processor is proposed using a fullerene peapod, i.e., an array of the endohedral fullerenes 15N@C60 or 31P@C60 contained in a single walled carbon nanotube (SWCNT). The qubits are encoded in the nuclear spins of the doped ... More
Cryogenic Characerization and Modeling of Standard CMOS down to Liquid Helium Temperature for Quantum ComputingNov 28 2018Jan 17 2019Cryogenic characterization and modeling of 0.18um CMOS technology (1.8V and 5V) are presented in this paper. Several PMOS and NMOS transistors with different width to length ratios(W/L) were extensively characterized under various bias conditions at temperatures ... More
Deconfined Quantum Critical Point on the Triangular LatticeOct 12 2017We first propose a topological term that captures the "intertwinement" between the standard "$\sqrt{3} \times \sqrt{3}$" antiferromagnetic order (or the so-called 120$^\circ$ state) and the "$\sqrt{12}\times \sqrt{12}$" valence solid bond (VBS) order ... More
Action-Attending Graphic Neural NetworkNov 17 2017The motion analysis of human skeletons is crucial for human action recognition, which is one of the most active topics in computer vision. In this paper, we propose a fully end-to-end action-attending graphic neural network (A$^2$GNN) for skeleton-based ... More
Neutron penumbral imaging simulation and reconstruction for Inertial Confinement Fusion ExperimentsJul 08 2012Neutron penumbral imaging technique has been successfully used as the diagnosis method in Inertial Confined Fusion. To help the design of the imaging systems in the future in CHINA. We construct the Monte carlo imaging system by Geant4. Use the point ... More
When Work Matters: Transforming Classical Network Structures to Graph CNNJul 07 2018Numerous pattern recognition applications can be formed as learning from graph-structured data, including social network, protein-interaction network, the world wide web data, knowledge graph, etc. While convolutional neural network (CNN) facilitates ... More
Assessment of central serous chorioretinopathy (CSC) depicted on color fundus photographs using deep LearningJan 14 2019To investigate whether and to what extent central serous chorioretinopathy (CSC) depicted on color fundus photographs can be assessed using deep learning technology. We collected a total of 2,504 fundus images acquired on different subjects. We verified ... More
$J/ψ+ jet$ diffractive production in the direct photon process at HERAJun 09 1999We present a study of $J/\psi + jet$ diffractive production in the direct photon process at HERA based on the factorization theorem for lepton-induced hard diffractive scattering and the factorization formalism of the nonrelativistic QCD (NRQCD) for quarkonia ... More
Demonstration of the double Q^2-rescaling modelJul 29 1998In this paper we have demonstrated the double Q^2-rescaling model (DQ^2RM) of parton distribution functions of nucleon bounded in nucleus. With different x-region of l-A deep inelastic scattering process we take different approach: in high x-region (0.1\le ... More
VulDeePecker: A Deep Learning-Based System for Vulnerability DetectionJan 05 2018The automatic detection of software vulnerabilities is an important research problem. However, existing solutions to this problem rely on human experts to define features and often miss many vulnerabilities (i.e., incurring high false negative rate). ... More
Wolf-Rayet Galaxies in the Sloan Digital Sky Survey: the metallicity dependence of the initial mass functionOct 14 2006We use a large sample of 174 Wolf-Rayet (WR) galaxies drawn from the Sloan Digital Sky Survey to study whether and how the slope of the stellar initial mass function depends on metallicity. We calculate for each object its oxygen abundance according to ... More
Efficient hinging hyperplanes neural network and its application in nonlinear system identificationMay 15 2019In this paper, the efficient hinging hyperplanes (EHH) neural network is proposed based on the model of hinging hyperplanes (HH). The EHH neural network is a distributed representation, the training of which involves solving several convex optimization ... 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
Antiferromagnetic Kondo lattice compound CePt$_{3}$PDec 30 2016A new ternary platinum phosphide CePt$_{3}$P was synthesized and characterized by means of magnetic, thermodynamic and transport measurements. The compound crystallizes in an antiperovskite tetragonal structure similar to that in the canonical family ... More
Instability of the non-Fermi liquid state of the Sachdev-Ye-Kitaev ModelJan 24 2017Apr 18 2017We study a series of perturbations on the Sachdev-Ye-Kitaev (SYK) model. We show that the chaotic non-Fermi liquid phase described by the ordinary $q = 4$ SYK model has marginally relevant/irrelevant (depending on the sign of the coupling constants) four-fermion ... More
Deep Recurrent Regression for Facial Landmark DetectionOct 30 2015Oct 31 2016We propose a novel end-to-end deep architecture for face landmark detection, based on a deep convolutional and deconvolutional network followed by carefully designed recurrent network structures. The pipeline of this architecture consists of three parts. ... More
Topological Superfluids with Finite Momentum Pairing and Majorana FermionsJul 04 2013Jul 10 2013Majorana fermions, quantum particles that are their own anti-particles, are not only of fundamental importance in elementary particle physics and dark matter, but also building blocks for fault-tolerant quantum computation. Recently Majorana fermions ... More
SySeVR: A Framework for Using Deep Learning to Detect Software VulnerabilitiesJul 18 2018Sep 21 2018The detection of software vulnerabilities (or vulnerabilities for short) is an important problem that has yet to be tackled, as manifested by many vulnerabilities reported on a daily basis. This calls for machine learning methods to automate vulnerability ... More
Maxwell's equal area law for Lovelock ThermodynamicsOct 22 2015Aug 22 2016We present the construction of Maxwell's equal area law for the Guass-Bonnet AdS black holes in $d=5,6$ and third order Lovelock AdS black holes in $d=7,8$. The equal area law can be used to find the number and location of the points of intersection in ... More
Phase diagrams of Weyl semimetals with competing intraorbital and interorbital disordersJan 13 2018Jun 07 2018A Weyl semimetal (WSM) is a topological material that hosts Weyl fermions as quasiparticles in the bulk. We study the combined effect of intra- and interorbital disorders on WSMs by adopting a tight-binding model that supports the WSM, three-dimensional ... More
Characterization and Modeling of 0.18μm CMOS Technology at sub-Kelvin TemperatureNov 30 2018Previous cryogenic electronics studies are most above 4.2K. In this paper we present the cryogenic characterization of a 0.18{\mu}m standard bulk CMOS technology(1.8V and 5V) at sub-kelvin temperature around 270mK. PMOS and NMOS devices with different ... More
Field-induced topological pair-density wave states in a multilayer optical latticeSep 03 2018We study the superfluid phases of a Fermi gas in a multilayer optical lattice system in the presence of out-of-plane Zeeman field, as well as spin-orbit (SO) coupling. We show that the Zeeman field combined with the SO coupling leads to exotic topological ... More
Cavity QED implementation of the multi-qubit refined Deutsch-Jozsa algorithmFeb 25 2010We theoretically study the realization of a multi-qubit refined Deutsch-Jozsa (DJ) algorithm using resonant interaction of many Rydberg atoms with a single-mode microwave cavity, in which the multi-qubit controlled phase gates could be accomplished efficiently. ... More
Fast fabrication of optical vortex generators by femtosecond laser ablationDec 26 2018Fast fabrication of micro-optical elements for generation of optical vortex beams based on the q-plate design is demonstrated by femtosecond (fs) laser ablation of gold film on glass. Q-plates with diameter of ~0.5 mm were made in ~1 min using galvanometric ... More
Bridging Fermionic and Bosonic Short Range Entangled StatesApr 24 2014Jul 14 2015In this paper we construct bosonic short range entangled (SRE) states in all spatial dimensions by coupling a $Z_2$ gauge field to fermionic SRE states with the same symmetries, and driving the $Z_2$ gauge field to its confined phase. We demonstrate that ... More
Emergent $Z_2$ Topological Invariant and Robust Helical Edge States in Two-Dimensional Topological MetalsMay 02 2019In this work, we study the disorder effect on topological metals that support a pair of helical edge modes deeply embedded inside the gapless bulk states. Strikingly, we predict that a quantum spin Hall (QSH) phase can be obtained from such topological ... More
Multi-Objective Learning and Mask-Based Post-Processing for Deep Neural Network Based Speech EnhancementMar 21 2017We propose a multi-objective framework to learn both secondary targets not directly related to the intended task of speech enhancement (SE) and the primary target of the clean log-power spectra (LPS) features to be used directly for constructing the enhanced ... More
Prevention of infectious diseases by public vaccination and individual protectionApr 13 2016Apr 21 2016In the face of serious infectious diseases, governments endeavour to implement containment measures such as public vaccination at a macroscopic level. Meanwhile, individuals tend to protect themselves by avoiding contacts with infections at a microscopic ... More
Energy-Time Entanglement-based Dispersive Optics Quantum Key Distribution over Optical Fibers of 20 kmJan 20 2019An energy-time entanglement-based dispersive optics quantum key distribution (DO-QKD) is demonstrated experimentally over optical fibers of 20 km. In the experiment, the telecom band energy-time entangled photon pairs are generated through spontaneous ... More
Telepresence Interaction by Touching Live Video ImagesDec 14 2015Aug 22 2016This paper presents a telepresence interaction framework based on touchscreen and telepresence-robot technologies. The core of the framework is a new user interface, Touchable live video Image based User Interface, called TIUI. The TIUI allows a remote ... 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
One-step implementation of multi-qubit conditional phase gating with nitrogen-vacancy centers coupled to a high-Q silica microsphere cavityJun 02 2010The diamond nitrogen-vacancy (NV) center is an excellent candidate for quantum information processing, whereas entangling separate NV centers is still of great experimental challenge. We propose an one-step conditional phase flip with three NV centers ... More
Graph Convolutional Transformer: Learning the Graphical Structure of Electronic Health RecordsJun 11 2019Effective modeling of electronic health records (EHR) is rapidly becoming an important topic in both academia and industry. A recent study showed that utilizing the graphical structure underlying EHR data (e.g. relationship between diagnoses and treatments) ... More
Closed Loop Load Model Identification Using Small Disturbance DataMay 15 2019Load model identification using small disturbance data is studied. It is proved that the individual load to be identified and the rest of the system forms a closed-loop system. Then, the impacts of disturbances entering the feedforward channel (internal ... More
Refined Schur Method for Robust Pole Assignment with Repeated PolesFeb 27 2016Schur-type methods in \cite{Chu2} and \cite{GCQX} solve the robust pole assignment problem by employing the departure from normality of the closed-loop system matrix as the measure of robustness. They work well generally when all poles to be assigned ... More
Chiral anomaly induced negative magnetoresistance in topological Weyl semimetal NbAsJun 10 2015In this paper, we report the intercone transport of Weyl fermions in NbAs with external magnetic field in parallel to electric field, a quantum phenomenon known as the Adler-Bell-Jackiw anomaly. Surprisingly, the resulting negative magnetoresistance (MR) ... More
Bilayer Graphene as a platform for Bosonic Symmetry Protected Topological StatesFeb 09 2016Mar 03 2017Bosonic symmetry protected topological (BSPT) states, the bosonic analogue of topological insulators, have attracted enormous theoretical interest in the last few years. Although BSPT states have been classified by various approaches, there is so far ... More
Wave Function and Strange Correlator of Short Range Entangled statesDec 02 2013Aug 07 2015We demonstrate the following conclusion: If $|\Psi\rangle$ is a $1d$ or $2d$ nontrivial short range entangled state, and $|\Omega \rangle$ is a trivial disordered state defined on the same Hilbert space, then the following quantity (so called strange ... More
Cryogenic low power CMOS analog buffer at 4.2KMay 23 2019A novel power-efficient analog buffer at liquid helium temperature is proposed. The proposed circuit is based on an input stage consisting of two complementary differential pairs to achieve rail-to-rail level tracking. Results of simulation based on SMIC ... More
Pattern-Affinitive Propagation across Depth, Surface Normal and Semantic SegmentationJun 08 2019In this paper, we propose a novel Pattern-Affinitive Propagation (PAP) framework to jointly predict depth, surface normal and semantic segmentation. The motivation behind it comes from the statistic observation that pattern-affinitive pairs recur much ... More
Analyzing $Ξ(1620)$ in the molecule picture in the Bethe-Salpeter equation approachJan 13 2019Jan 17 2019In this work, we assume that the observed state $\Xi(1620)$ is a $s$-wave $\Lambda\bar{K}$ or $\Sigma\bar{K}$ bound state. Based on this molecule picture, we establish the Bethe-Salpeter equations for $\Xi(1620)$ in the ladder and instantaneous approximations. ... More
Non-equilibrium transport in the pseudospin-1 Dirac-Weyl systemSep 28 2017Solid state materials hosting pseudospin-1 quasiparticles have attracted a great deal of recent attention. In these materials, the energy band contains of a pair of Dirac cones and a flat band through the connecting point of the cones. As the "caging" ... 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
Doubly Heavy Baryon Production at A High Luminosity $e^+ e^-$ ColliderAug 15 2012Sep 01 2012Within the framework of nonrelativistic QCD, we make a detailed discussion on the doubly heavy baryon production through the $e^+ e^-$ annihilation channel, $e^{+}e^{-}\rightarrow\gamma/Z^0 \rightarrow \Xi_{QQ^{\prime}} +\bar{Q} +\bar{Q^{\prime}}$, at ... More
Sr$_{0.9}$K$_{0.1}$Zn$_{1.8}$Mn$_{0.2}$As$_{2}$: a ferromagnetic semiconductor with colossal magnetoresistanceSep 09 2014A bulk diluted magnetic semiconductor (Sr,K)(Zn,Mn)$_{2}$As$_{2}$ was synthesized with decoupled charge and spin doping. It has a hexagonal CaAl$_{2}$Si$_{2}$-type structure with the (Zn,Mn)$_{2}$As$_{2}$ layer forming a honeycomb-like network. Magnetization ... More
Neural Multi-Scale Self-Supervised Registration for Echocardiogram Dense TrackingJun 18 2019Echocardiography has become routinely used in the diagnosis of cardiomyopathy and abnormal cardiac blood flow. However, manually measuring myocardial motion and cardiac blood flow from echocardiogram is time-consuming and error-prone. Computer algorithms ... More
Novel Monte Carlo representation for shell model in the complex energy planeJun 05 2013A Monte Carlo method is presented to evaluate quantum states with many particles moving in the continuum. The scattering state is generated at each time by a Monte Carlo random sampling algorithm. The same calculation are repeated until the average energies ... More