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On Analysis of the Bitcoin and Prism Backbone ProtocolsJul 11 2019Bitcoin is a peer-to-peer payment system proposed by Nakamoto in 2008. Properties of the bitcoin backbone protocol have been investigated in some depth: the blockchain growth property quantifies the number of blocks added to the blockchain during any ... More

Modeling edge effects in Graphene Nanoribbon Field-effect Transistors with real and mode space methodsFeb 26 2009A computationally efficient mode space simulation method for atomistic simulation of a graphene nanoribbon field-effect transistor in the ballistic limits is developed. The proposed simulation scheme, which solves the nonequilibrium Green's function coupled ... More

Inelastic Phonon Scattering in Graphene FETsApr 07 2011Jul 30 2011Inelastic phonon scattering in graphene field-effect transistors (FETs) is studied by numerically solving the Boltzmann transport equation in three dimensional real and phase spaces (x, kx, ky). A kink behavior due to ambipolar transport agreeing with ... More

Performance Assessment of Resonantly Driven Silicon Two-Qubit Quantum GateAug 27 2018Sep 09 2018Two-qubit quantum gates play an essential role in quantum computing, whose operation critically depends on the entanglement between two qubits. Resonantly driven controlled-NOT (CNOT) gates based on silicon double quantum dots (DQDs) are studied theoretically. ... More

Assessment of High-Frequency Performance Limits of Graphene Field-Effect TransistorsFeb 07 2011High frequency performance limits of graphene field-effect transistors (FETs) down to a channel length of 20nm are examined by using self-consistent quantum simulations. The results indicate that although Klein band-to-band tunneling is significant for ... More

Effect of edge roughness in graphene nanoribbon transistorsDec 23 2007The effects of edge irregularity and mixed edge shapes on the characteristics of graphene nanoribbon transistors are examined by self-consistent atomistic simulations based on the non-equilibrium Green's function formalism. The minimal leakage current ... More

Computational Assessment of Silicon Quantum Gate Based on Detuning Mechanism for Quantum ComputingJan 17 2019May 29 2019Silicon-based quantum computing has the potential advantages of low cost, high integration density, and compatibility with CMOS technologies. The detuning mechanism has been used to experimentally achieve silicon two-qubit quantum gates and programmable ... More

Identification of the newly observed $Σ_b(6097)^\pm$ baryons from their strong decaysOct 16 2018Two bottom $\Sigma_b(6097)^\pm$ baryons were observed in the final states $\Lambda_b^0\pi^-$ and $\Lambda_b^0\pi^+$ in $pp$ collision by LHCb collaboration, whose masses and widths were measured. In a $^{3}P_{0}$ model, the strong decay widths of two ... More

Strong Decays of observed $Λ_c$ Baryons in the $^3P_0$ ModelFeb 20 2019The strong decay widths and some important branching ratios of possible Okubo-Zweig-Iizuka(OZI)-allowed strong decay channels of $\Lambda_c(2595)^+$, $\Lambda_c(2625)^+$, $\Lambda_c(2765)^+$ ($\Sigma_c(2765)^+$), $\Lambda_c(2860)^+$, $\Lambda_c(2880)^+$ ... More

A determination of dark matter bispectrum with a large set of N-body simulationsApr 21 2009We use a set of numerical N-body simulations to study the large-scale behavior of the reduced bispectrum of dark matter and compare the results with the second-order perturbation theory and the halo models for different halo mass functions. We find that ... More

Multilayer graphene under vertical electric fieldMay 24 2011We study the effect of vertical electric field (E-field) on the electronic properties of multilayer graphene. We show that the effective mass, electron velocity and density-of-state of a bilayer graphene are modified under the E-field. We also study the ... More

Impact of ordering competition on the global phase diagram of iron pnictidesNov 20 2015We consider the impact of the competition among superconductivity, spin density wave, and nematic order in iron pnictides, and show that the ordering competition substantially reshapes the global phase diagram. We perform a detailed renormalization group ... More

Dynamics of two qubits in a spin-bath of Quantum anisotropic Heisenberg XY coupling typeDec 25 2006Oct 15 2007The dynamics of two 1/2-spin qubits under the influence of a quantum Heisenberg XY type spin-bath is studied. After the Holstein-Primakoff transformation, a novel numerical polynomial scheme is used to give the time-evolution calculation of the center ... More

Strain induced conductance modulation in graphene grain boundaryFeb 10 2012Grain boundaries (GBs) are ubiquitous in polycrystalline graphene materials obtained by various growth methods. It has been shown previously that considerable electrical transport gap can be opened by grain boundaries. On the other hand, polycrystalline ... More

Multilayer graphene nanoribbon under vertical electric fieldJul 26 2011We study the effect of vertical electric-field (E-field) on the electronic properties of the multilayer armchair graphene nanoribbon (aGNR). Under E-field, the band structure of a bilayer aGNR undergoes interesting transformations such as change in the ... More

A high order conservative semi-Lagrangian discontinuous Galerkin method for two-dimensional transport simulationsDec 21 2016Sep 22 2017In this paper, we develop a class of high order conservative semi-Lagrangian (SL) discontinuous Galerkin (DG) methods for solving multi-dimensional linear transport equations. The methods rely on a characteristic Galerkin weak formulation, leading to ... More

Gate Electrostatics and Quantum Capacitance of Graphene NanoribbonsMay 22 2007Capacitance-voltage (C-V) characteristics are important for understanding fundamental electronic structures and device applications of nanomaterials. The C-V characteristics of graphene nanoribbons (GNRs) are examined using self-consistent atomistic simulations. ... More

Effect of Phonon Scattering on Intrinsic Delay and Cut-Off Frequency of Carbon Nanotube FETsJun 30 2006Jul 03 2006The effect of phonon scattering on the intrinsic delay and cut-off frequency of Schottky barrier carbon nanotube (CNT) FETs is examined by self-consistently solving the Poisson equation and the Schrodinger equation using the non-equilibrium Greens function ... More

Performance Analysis of Arbitrarily-Shaped Underlay Cognitive Networks: Effects of Secondary User Activity ProtocolsMar 19 2014Nov 07 2014This paper analyzes the performance of the primary and secondary users (SUs) in an arbitrarily-shaped underlay cognitive network. In order to meet the interference threshold requirement for a primary receiver (PU-Rx) at an arbitrary location, we consider ... More

Controllable dynamics of two separate qubits in Bell statesMay 23 2007Oct 09 2007The dynamics of entanglement and fidelity for a subsystem of two separate spin-1/2 qubits prepared in Bell states is investigated. One of the subsystem qubit labelled $A$ is under the influence of a Heisenberg XY spin-bath, while another one labelled ... More

Disorder effects at a nematic quantum critical point in d-wave cuprate superconductorJan 07 2011Jun 09 2011A d-wave high temperature cuprate superconductor exhibits a nematic ordering transition at zero temperature. Near the quantum critical point, the coupling between gapless nodal quasiparticles and nematic order parameter fluctuation can result in unusual ... More

Simulation of Schottky-Barrier Phosphorene TransistorsAug 21 2014Schottky barrier field-effect transistors (SBFETs) based on few and mono layer phosphorene are simulated by the non-equilibrium Green's function formalism. It is shown that scaling down the gate oxide thickness results in pronounced ambipolar I-V characteristics ... More

A Computational Study of Vertical Partial Gate Carbon Nanotube FETsDec 23 2007A vertical partial gate carbon nanotube (CNT) field-effect transistor (FET), which is amenable to the vertical CNT growth process and offers the potential for a parallel CNT array channel, is simulated using a self-consistent atomistic approach. We show ... More

General proof of the entropy principle for self-gravitating fluid in f(R) GravityDec 17 2015May 27 2016The discussions on the connection between gravity and thermodynamics attract much attention recently. We consider a static self-gravitating perfect fluid system in $f(R)$ gravity, which is an important theory could explain the accelerated expansion of ... More

A Tractable Framework for Exact Probability of Node Isolation and Minimum Node Degree Distribution in Finite Multi-hop NetworksDec 06 2012Nov 29 2013This paper presents a tractable analytical framework for the exact calculation of probability of node isolation and minimum node degree distribution when $N$ sensor nodes are independently and uniformly distributed inside a finite square region. The proposed ... More

Soft Control on Collective Behavior of a Group of Autonomous Agents by a Shill AgentJul 06 2010This paper asks a new question: how can we control the collective behavior of self-organized multi-agent systems? We try to answer the question by proposing a new notion called 'Soft Control', which keeps the local rule of the existing agents in the system. ... More

Operating Principles of Vertical Transistors Based on Monolayer Two-Dimensional Semiconductor HeterojunctionsAug 13 2014A vertical transistor based on a double gated, atomically thin heterojunction is theoretically examined. Both p-type and n-type transistor operations can be conveniently achieved by using one of the two gates as the switching gate. The transistor shows ... More

Performance limits projection of black phosphorous field-effect transistorsJul 08 2014Ballistic device performance of monolayer black phosphorous (BP) field-effect transistors (FET) is investigated in this work. Due to the anisotropic effect mass of the carriers, the ON-state current is dependent on the transport direction. The effective ... More

Computational Study of Tunneling Transistor Based on Graphene NanoribbonFeb 26 2009Tunneling field-effect transistors (FETs) have been intensely explored recently due to its potential to address power concerns in nanoelectronics. The recently discovered graphene nanoribbon (GNR) is ideal for tunneling FETs due to its symmetric bandstructure, ... More

Breakdown of the rotating-wave approximation in entanglement description of spin anti-correlated statesNov 28 2008May 01 2009It is well established that an entanglement encoded in the Bell states of a two-qubit system with correlated spins exhibits completely different evolution properties than that encoded in states with the anti-correlated spins. A complete and abrupt loss ... More

Outage Probability in Arbitrarily-Shaped Finite Wireless NetworksApr 23 2013Dec 20 2013This paper analyzes the outage performance in finite wireless networks. Unlike most prior works, which either assumed a specific network shape or considered a special location of the reference receiver, we propose two general frameworks for analytically ... More

Effect of three-spin interaction on thermal entanglement in Heisenberg XXZ modelSep 30 2017The effect of three-spin interaction k on thermal entanglement between alternate qubits is studied using pairwise concurrence C and energy level diagram. It is found that k breaks the symmetry about the effect of magnetic field h on C. It shifts a dip ... More

Effects of edge chemistry doping on graphene nanoribbon mobilityJul 24 2011Doping of semiconductor is necessary for various device applications. Exploiting chemistry at its reactive edges was shown to be an effective way to dope an atomically thin graphene nanoribbon (GNR) for realizing new devices in recent experiments. The ... More

A Numerical Study of Scaling Issues for Schottky Barrier Carbon Nanotube TransistorsJun 08 2003Jun 11 2003We performed a comprehensive scaling study of Schottky barrier carbon nanotube transistors using self-consistent, atomistic scale simulations. We restrict our attention to Schottky barrier carbon nanotube FETs whose metal source/drain is attached to an ... More

Non-local dynamics of Bell states in separate cavitiesNov 13 2007We present non-local dynamics of Bell states in separate cavities. It is demonstrated that (i) the entanglement damping speed will saturate when the cavity leakage rate $\gamma\geq 0.4$; (ii) the synchronism relationship between the fidelity and the concurrence ... More

Local field modulated entanglment among three distant atomsSep 21 2005We extend the scheme for that proposed by S. Mancini and S. Bose (Phys. Rev. A \QTR{bf}{70}, 022307(2004)) to the case of triple-atom. Under mean field approximation, we obtain an effective Hamiltonian of triple-body Ising-model interaction. Furthermore, ... More

Field tuned atom-atom entanglement via diople-dipole interactionSep 21 2005We propose a simple scheme, in which only one atom couples to a cavity field, to entangle two two-level atoms. We connect two atoms with dipole-dipole interaction since one of them can move around the cavity. The results show that the peak entanglment ... More

Performance Comparison of Graphene Nanoribbon FETs with Schottky Contacts and Doped ReservoirsJul 10 2008We present an atomistic 3D simulation study of the performance of graphene nanoribbon (GNR) Schottky barrier (SB) FETs and transistors with doped reservoirs (MOSFETs) by means of the self-consistent solution of the Poisson and Schrodinger equations within ... More

Fault-Tolerant Path-Embedding of Twisted Hypercube-Like Networks THLNsJun 12 2019The twisted hypercube-like networks($THLNs$) contain several important hypercube variants. This paper is concerned with the fault-tolerant path-embedding of $n$-dimensional($n$-$D$) $THLNs$. Let $G_n$ be an $n$-$D$ $THLN$ and $F$ be a subset of $V(G_n)\cup ... More

Using an Instrumental Variable to Test for Unmeasured ConfoundingJan 23 2016An important concern in an observational study is whether or not there is unmeasured confounding, i.e., unmeasured ways in which the treatment and control groups differ before treatment that affect the outcome. We develop a test of whether there is unmeasured ... More

Does the 62-day X-ray periodicity come from ULX M82 X-1?Sep 06 2015M82 X-1 is the brightest ultraluminous X-ray source in starburst galaxy M82 and is one of the best intermediate mass black hole candidates. Previous studies based on the Rossi X-ray Timing Explorer/Proportional Counter Array (RXTE/PCA) reported a regular ... More

A new opportunity for two-dimensional van der Waals heterostructures: making steep-slope transistorsAug 26 2019The use of a foreign metallic cold source (CS) has recently been proposed as a promising approach toward the steep-slope field-effect-transistor (FET). In addition to the selection of source material with desired density of states-energy relation (D(E)), ... More

Device-to-Device Communication Underlaying a Finite Cellular Network RegionOct 12 2015Oct 27 2016Underlay in-band device-to-device (D2D) communication can improve the spectrum efficiency of cellular networks. However, the coexistence of D2D and cellular users causes inter-cell and intra-cell interference. The former can be effectively managed through ... More

Influence of binding energies of electrons on nuclear mass predictionsNov 26 2015Feb 23 2016Nuclear mass contains a wealth of nuclear structure information, and has been widely employed to extract the nuclear effective interactions. The known nuclear mass is usually extracted from the experimental atomic mass by subtracting the masses of electrons ... More

Design of Non-orthogonal Multiple Access Enhanced Backscatter CommunicationNov 30 2017Backscatter communication (BackCom), which allows a backscatter node (BN) to communicate with the reader by modulating and reflecting the incident continuous wave from the reader, is considered as a promising solution to power the future Internet-of-Things. ... More

Machine Learning Approach for Device-Circuit Co-Optimization of Stochastic-Memristive-Device-Based Boltzmann MachineMay 11 2019May 14 2019A Boltzmann machine whose effective "temperature" can be dynamically "cooled" provides a stochastic neural network realization of simulated annealing, which is an important metaheuristic for solving combinatorial or global optimization problems with broad ... More

The Fundamental Relation between Halo Mass and Galaxy Group PropertiesJul 02 2019Aug 05 2019We explore the interrelationships between the galaxy group halo mass and various observable group properties. We propose a simple scenario that describes the evolution of the central galaxies and their host dark matter halos. Star formation quenching ... More

Thick-disc model to explain the spectral state transition in NGC 247Feb 25 2019We propose the thick-disc model of Gu et al. 2016 to interpret the transition between soft ultraluminous state (SUL) and supersoft ultraluminous (SSUL) state in NGC 247. As accretion rate increases, the inner disc will puff up and act as shield to block ... More

Exploring neutrino mass and mass hierarchy in the scenario of vacuum energy interacting with cold dark matterMar 19 2018Aug 29 2018We investigate the constraints on total neutrino mass in the scenario of vacuum energy interacting with cold dark matter. We focus on two typical interaction forms, i.e., $Q=\beta H\rho_{\rm c}$ and $Q=\beta H\rho_{\Lambda}$. To avoid the occurrence of ... More

Gravitational Wave Imprint of New Symmetry BreakingJul 31 2017It is believed that there are extra fundamental gauge symmetries beyond these described by the Standard Model of particle physics. The scale of these new gauge symmetries are usually too high to be reachable by particle colliders. Considering that the ... More

Power Beacon-Assisted Millimeter Wave Ad Hoc NetworksMar 20 2017Sep 06 2017Deployment of low cost power beacons (PBs) is a promising solution for dedicated wireless power transfer (WPT) in future wireless networks. In this paper, we present a tractable model for PB-assisted millimeter wave (mmWave) wireless ad hoc networks, ... More

Accelerated Symmetric ADMM and Its Applications in Signal ProcessingJun 28 2019Jul 01 2019The alternating direction method of multipliers (ADMM) were extensively investigated in the past decades for solving separable convex optimization problems. Fewer researchers focused on exploring its convergence properties for the nonconvex case although ... More

Discrete mechanics Based on Finite Element MethodsMar 04 2002Discrete Mechanics based on finite element methods is presented in this paper. We also explore the relationship between this discrete mechanics and Veselov discrete mechanics. High order discretizations are constructed in terms of high order interpolations. ... More

Constraints on brane inflation after Planck 2015: Impacts of the latest local measurement of the Hubble constantJan 07 2018Jul 11 2018We investigate the observational constraints on three typical brane inflation models by considering the latest local measurement of the Hubble constant in the global fit. We also employ other observational data, including the Planck 2015 CMB data, the ... More

Heating and Cooling in Adiabatic Mixing processMay 28 2010Feb 18 2011We study the effect of interaction on the temperature change in the process of adiabatic mixing two components of fermi gases by the real-space Bogoliubov-de Gennes (BdG) method. We find that in the process of adiabatic mixing, the competition of the ... More

Primordial Black Holes from Cosmic Domain WallsAug 07 2019We investigate the formation of primordial black holes (PBHs) from the collapse of spherically symmetric domain wall bubbles, which spontaneously nucleate via quantum tunneling during inflation. Since the tension of domain walls changes with time and ... More

Gravitational wave production after inflation with cuspy potentialsDec 20 2018May 08 2019We investigate the effect of the cuspiness of scalar potentials on the production of gravitational waves during oscillon formation after inflation. We consider a more general form of potentials with a mass parameter $M$, which repoduce cuspy potentials ... More

Mediation Analysis for Count and Zero-Inflated Count Data without Sequential Ignorability and Its Application in Dental StudiesJan 23 2016Jul 09 2016Mediation analysis seeks to understand the mechanism by which a treatment affects an outcome. Count or zero-inflated count outcome are common in many studies in which mediation analysis is of interest. For example, in dental studies, outcomes such as ... More

Towards Multi-Scale Modeling of Carbon Nanotube TransistorsDec 20 2003Multiscale simulation approaches are needed in order to address scientific and technological questions in the rapidly developing field of carbon nanotube electronics. In this paper, we describe an effort underway to develop a comprehensive capability ... More

Predicted Performance Advantages of Carbon Nanotube Transistors with Doped Nanotubes as Source/DrainSep 01 2003Most carbon nanotube field-effect transistors (CNTFETs) directly attach metal source/drain contacts to an intrinsic nanotube channel. When the gate oxide thickness is reduced, such transistors display strong ambipolar conduction, even when the Schottky ... More

Quantum evolution speed in the finite-temperature bosonic environmentMay 06 2018We investigate the quantum evolution speed of a qubit in two kinds of finite-temperature environments. The first environment is a bosonic bath with Ohmic-like spectrum. It is found that the high temperature not only leads to the speed-up but also speed-down ... More

The manipulated left-handedness in a rare-earth-ion-doped optical fiber by the incoherent pumping fieldDec 19 2018The left-handedness was demonstrated by the simulation with a three-level quantum system in an E3+r -dopped ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAFN) optical fiber. And the left-handedness can be regulated by the incoherent pumping field. Our scheme may provide ... More

Underlay Drone Cell for Temporary Events: Impact of Drone Height and Aerial Channel EnvironmentsSep 17 2018Oct 09 2018Providing seamless connection to a large number of devices is one of the biggest challenges for the Internet of Things (IoT) networks. Using a drone as an aerial base station (ABS) to provide coverage to devices or users on ground is envisaged as a promising ... More

An Effective Two-component Entanglement in Double-well CondensationJul 19 2005We propose a spin-half approximation method for two-component condensation in double wells to discuss the quantum entanglement of two components. This approximation is presented to be valid under stationary tunneling effect for odd particle number of ... More

Studying the bound state of the $B\bar{K}$ system in the Bethe-Salpeter formalismFeb 13 2018Feb 19 2019In this work, we study the $B\bar{K}$ molecule in the Bethe-Salpeter (BS) equation approach. With the kernel containing one-particle-exchange diagrams and introducing two different form factors (monopole form factor and dipole form factor) in the vertex, ... More

Revisit of constraints on dark energy with Hubble parameter measurements including future redshift drift observationsNov 29 2018Apr 22 2019We investigate whether the current Hubble parameter $H(z)$ measurements could help improve the constraints on dark energy on the basis of the mainstream cosmological probes including the type Ia supernovae (SN) observation, the cosmic microwave background ... More

Can the $H_0$ tension be resolved in extensions to $Λ$CDM cosmology?Sep 07 2018Jan 28 2019We wish to investigate whether there is an extension to the base $\Lambda$CDM cosmology that can resolve the tension between the Planck observation of the cosmic microwave background anisotropies and the local measurement of the Hubble constant. We consider ... More

Gravitational Waves from Oscillons with Cuspy PotentialsJul 31 2017Jan 12 2018We study the production of gravitational waves during oscillations of the inflaton around the minimum of a cuspy potential after inflation. We find that a cusp in the potential can trigger copious oscillon formation, which sources a characteristic energy ... More

Performance Limits of Monolayer Transition Metal Dichalcogenide TransistorsJun 22 2011The performance limits of monolayer transition metal dichalcogenide transistors are examined with a ballistic MOSFET model. Using ab-initio theory, we calculate the band structures of two-dimensional (2D) transition metal dichalco-genide (MX2). We find ... More

Construction of Bound Entangled States Based on Permutation OperatorsFeb 17 2016We present a construction of new bound entangled states from given bound entangled states for arbitrary dimensional bipartite systems. One way to construct bound entangled states is to show that these states are PPT (positive partial transpose) and violate ... More

Uplink Coverage Performance of an Underlay Drone Cell for Temporary EventsJan 18 2018May 20 2018Using a drone as an aerial base station (ABS) to provide coverage to users on the ground is envisaged as a promising solution for beyond fifth generation (beyond-5G) wireless networks. While the literature to date has examined downlink cellular networks ... More

Massive Machine Type Communication with Data Aggregation and Resource SchedulingNov 10 2016Apr 13 2017To enable massive machine type communication (mMTC), data aggregation is a promising approach to reduce the congestion caused by a massive number of machine type devices (MTDs). In this work, we consider a two-phase cellular-based mMTC network where MTDs ... More

Evaluation of the Energy Efficiency in a Mixed Traffic with Automated Vehicles and Human Controlled VehiclesJun 01 2018The energy efficiency of Connected and Automated Vehicles (CAVs) is significantly influenced by surrounding road users. This paper presents the evaluation of energy efficiency of CAVs in a mixed traffic interacted with human controlled vehicles. To simulate ... 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

Full one-loop electroweak corrections to $h^0(H^0,A^0) H^\pm W^\mp$ associated productions at $e^+e^-$ linear collidersFeb 15 2007Feb 16 2007We study the complete one-loop electroweak(EW) corrections to the processes of single charged Higgs boson production associated with a neutral Higgs boson$(h^0,H^0,A^0)$ and a gauge boson $W^\pm$ in the framework of the minimal supersymmetric standard ... 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

Enhancing squeezing and nonclassicality of light in atom-optomechanical systemsMay 29 2018Aug 21 2018Quadrature squeezing of light is investigated in a hybrid atom-optomechanical system comprising a cloud of two-level atoms and a movable mirror mediated by a single-mode cavity field. When the system is at high temperatures with quadrature fluctuations ... More

SEA: A Combined Model for Heat Demand PredictionJul 28 2018Heat demand prediction is a prominent research topic in the area of intelligent energy networks. It has been well recognized that periodicity is one of the important characteristics of heat demand. Seasonal-trend decomposition based on LOESS (STL) algorithm ... More

Quintuple-layer epitaxy of high-quality Bi2Se3 thin films for topological insulatorJun 29 2009We report the growth of atomically smooth, single crystalline Bi2Se3 thin films on Si(111) by using molecular beam epitaxy. Scanning tunneling microscopy, low-energy electron diffraction, X-ray photoelectron emission spectroscopy and Raman spectroscopy ... More

Broad-Band Negative Refraction via Simultaneous Multi-Electron TransitionsJul 06 2018We analyze different factors which influence the negative refraction in solids and multi-atom molecules. We find that this negative refraction is significantly influenced by simultaneous multi-electron transitions with the same transition frequency and ... More

Hyperbolic Dispersion in Chiral MoleculesMay 08 2019We theoretically investigate the intra-band transitions in M\"{o}bius molecules. Due to the weak magnetic response, the relative permittivity is significantly modified by the presence of the medium while the relative permeability is not. We show that ... More

Observation of topological states residing at step edges of WTe2Mar 16 2017Topological states emerge at the boundary of solids as a consequence of the nontrivial topology of the bulk. Recently, theory predicts a topological edge state on single layer transition metal dichalcogenides with 1T' structure. However, its existence ... More

Transmission Character of General Function Photonic CrystalsMay 06 2012Dec 01 2012In the paper, we present a new general function photonic crystals (GFPCs), which refractive index of medium is a arbitrary function of space position. Unlike conventional photonic crystals (PCs), which structure grow from two mediums $A$ and $B$, with ... More

When coding meets ranking: A joint framework based on local learningSep 08 2014Nov 02 2016Sparse coding, which represents a data point as a sparse reconstruction code with regard to a dictionary, has been a popular data representation method. Meanwhile, in database retrieval problems, learning the ranking scores from data points plays an important ... More

Undercooling growth and magnetic characterization of ferromagnetic shape memory alloy Ni2FeGa single crystalsNov 12 2013Ni2FeGa single crystals have been grown in undercooling conditions provided by a glass-purification method. It has been found that trace amounts of gamma phase embededin the single crystalline matrix preferentially orients in the <100> orientation along ... More

Medical Knowledge Embedding Based on Recursive Neural Network for Multi-Disease DiagnosisSep 22 2018The representation of knowledge based on first-order logic captures the richness of natural language and supports multiple probabilistic inference models. Although symbolic representation enables quantitative reasoning with statistical probability, it ... More

If graphynes turn into graphene: the thermal stability studyOct 08 2013The thermal stability of $\alpha$-, $\beta$-, 6,6,12-graphyne and graphdiyne was studied by a statistic model, which was seriously tested by classical molecular dynamics simulations. By first-principles calculations of related potential energy curves, ... More

Quantum Renormalization of the Spin Hall EffectJul 22 2010By quantum Monte Carlo simulation of a realistic multiorbital Anderson impurity model, we study the spin-orbit interaction (SOI) of an Fe impurity in Au host metal. We show, for the first time, that the SOI is strongly renormalized by the quantum spin ... More

Robustness of the semimetal state of Na3Bi and Cd3As2 against Coulomb interactionAug 14 2017Apr 20 2018We study the excitonic semimetal-insulator quantum phase transition in three-dimensional Dirac semimetal in which the fermion dispersion is strongly anisotropic. After solving the Dyson-Schwinger equation for the excitonic gap, we obtain a global phase ... More

Jet Radiation Properties of 4C +49.22: from the Core to Large-Scale KnotsAug 24 20184C +49.22 is a gamma-ray flat spectrum radio quasar with a bright and knotty jet. We investigate the properties of the core and large-scale knots by using their spectral energy distributions (SEDs). Analyzing its Fermi/LAT data in the past 8 years, a ... More

Platinum/Yttrium Iron Garnet Inverted Structures for Spin Current TransportApr 28 201630-80 nm thick yttrium iron garnet (YIG) films are grown by pulsed laser deposition on a 5 nm thick sputtered Pt atop gadolinium gallium garnet substrate (GGG) (110). Upon post-growth rapid thermal annealing, single crystal YIG(110) emerges as if it were ... More

Modeling Text with Graph Convolutional Network for Cross-Modal Information RetrievalFeb 03 2018Feb 13 2018Cross-modal information retrieval aims to find heterogeneous data of various modalities from a given query of one modality. The main challenge is to map different modalities into a common semantic space, in which distance between concepts in different ... More

Room Temperature All Semiconducting sub-10nm Graphene Nanoribbon Field-Effect TransistorsMar 24 2008May 03 2008Sub-10nm wide graphene nanoribbon field-effect transistors (GNRFETs) are studied systematically. All sub-10nm GNRs afforded semiconducting FETs without exception, with Ion/Ioff ratio up to 10^6 and on-state current density as high as ~2000uA/um. We estimated ... More

Creation of a new vector field and focusing engineeringDec 29 2009Recently many methods have been proposed to create the vector fields, due to the academic interest and a variety of attractive applications such as for particle acceleration, optical trapping, particle manipulation, and fluorescence imaging. For the most ... More

Probing the sign-changeable interaction between dark energy and dark matter with current observationsOct 09 2017Jan 13 2018We consider the models of vacuum energy interacting with cold dark matter in this study, in which the coupling can change sigh during the cosmological evolution. We parameterize the running coupling $b$ by the form $b(a)=b_0a+b_e(1-a)$, where at the early-time ... More

X(3872) as a molecular $D\bar{D}^*$ state in the Bethe-Salpeter equation approachOct 20 2017We discuss the possibility that the X(3872) can be a $D\bar{D}^*$ molecular bound state in the Bethe-Salpeter equation approach in the ladder and instantaneous approximations. We show that the $D\bar{D}^*$ bound state with quantum numbers $J^{PC}=1^{++}$ ... More

The design of optical triodeOct 30 2015Nov 19 2015Under the action of pump light, the conventional photonic crystal can be turned into function photonic crystal. In the paper, we have designed optical triode with one-dimensional function photonic crystal, and analyzed the effect of period number, medium ... More

Triangle singularities in ${J/ψ\rightarrowηπ^0φ}$ and ${π^0π^0φ}$Jul 30 2019Aug 02 2019The BESIII Collaboration recently reported the observation of the $a_0(980)^0-f_0(980)$ mixing in the isospin breaking decay $J/\psi\to \eta\pi^0\phi$. In the Dalitz plot for that decay with the $\eta$ reconstructed from two photons, there is a band around ... More

Band Gap of Strained Graphene NanoribbonsDec 14 2009Jan 20 2010The band structures of strained graphene nanoribbons (GNRs) are examined by a tight binding Hamiltonian that is directly related to the type and strength of strains. Compared to the two-dimensional graphene whose band gap remains close to zero even if ... More

Interplay of Coulomb interaction and disorder in a two-dimensional semi-Dirac fermion systemJul 26 2016Nov 09 2016It was recently found that Coulomb interaction can induce a series of nontrivial spectral and transport properties in a two-dimensional anisotropic Weyl semimetal. Different from graphehe that is basically an ordinary Fermi liquid, the Coulomb interaction ... More