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Results for "Y. J. Hu"

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Testing the Distance-Duality Relation in the $R_h=ct$ UniverseApr 18 2018In this paper, we test the cosmic distance duality (CDD) relation using the luminosity distances from joint light-curve analysis (JLA) type Ia supernovae (SNe Ia) sample and angular diameter distance sample from galaxy clusters. The $R_h=ct$ and $\Lambda$CDM ... More
High-order Harmonic Generation in a Time-integrated Quantum Transition PictureNov 13 2008We develop a numerical scheme to investigate the high-order harmonic generation (HHG) in intense laser-matter interactions. Tracing the time evolution of every electronic laser-field-free state, we "observe" the HHG in a time-integrated quantum transition ... More
Loss-resistant state teleportation and entanglement swapping using a quantum-dot spin in an optical microcavityMay 30 2010Sep 13 2010We present a scheme for efficient state teleportation and entanglement swapping using a single quantum-dot spin in an optical microcavity based on giant circular birefringence. State teleportation or entanglement swapping is heralded by the sequential ... More
Deterministic noiseless amplification of coherent statesMar 12 2015A universal deterministic noiseless quantum amplifier has been shown to be impossible. However, probabilistic noiseless amplification of a certain set of states is physically permissible. Regarding quantum state amplification as quantum state transformation, ... More
Extended linear regime of cavity-QED enhanced optical circular birefringence induced by a charged quantum dotSep 12 2014Jan 26 2015Giant optical Faraday rotation (GFR) and giant optical circular birefringence (GCB) induced by a single quantum-dot spin in an optical microcavity can be regarded as linear effects in the weak-excitation approximation if the input field lies in the low-power ... More
Investigating the effect of cosmic opacity on standard candlesJan 21 2017Standard candles can probe the evolution of dark energy in a large redshift range. But the cosmic opacity can degrade the quality of standard candles. In this paper, we use the latest observations, including type Ia supernovae (SNe Ia) from JLA sample ... More
Catastrophic eruption of magnetic flux rope in the corona and solar wind with and without magnetic reconnectionMay 26 2007It is generally believed that the magnetic free energy accumulated in the corona serves as a main energy source for solar explosions such as coronal mass ejections (CMEs). In the framework of the flux rope catastrophe model for CMEs, the energy may be ... More
The asymmetric structure of the Galactic haloFeb 26 2006Using the stellar photometry catalogue based on the latest data release (DR4) of the Sloan Digital Sky Survey (SDSS), a study of the Galactic structure using star counts is carried out for selected areas of the sky. The sample areas are selected along ... More
The structure of the Galactic halo: SDSS versus SuperCOSMOSMar 20 2007May 23 2007The halo structure at high Galactic latitudes near both the north and south poles is studied using SDSS and SuperCOSMOS data. For the south cap halo, the archive of the SuperCOSMOS photographic photometry sky survey is used. The coincident source rate ... More
1RXS J232953.9+062814: a New SU UMa Dwarf Nova below the Period MinimumDec 02 20011RXS J232953.9+062814 was identified as a cataclysmic variable by Wei et al. (1999). Four low-resolution spectra of 1RXS J232953.9+062814 were obtained by using the 2.16-m telescope of the National Astronomical Observatories, in which two of them were ... More
Spin-orbit coupling and weak antilocalization in thermoelectric material $β$-K$_{2}$Bi$_{8}$Se$_{13}$Dec 20 2013We have studied the effect of spin-orbital coupling (SOC) on electronic transport properties of the thermoelectric material $\beta$-K$_{2}$Bi$_{8}$Se$_{13}$ via magnetoresistance (MR) measurements. We found that the strong SOC in this material results ... More
Entangling photons using a charged quantum dot in a microcavityNov 09 2007We present two novel schemes to generate photon polarization entanglement via single electron spins confined in charged quantum dots inside microcavities. One scheme is via entangled remote electron spins followed by negatively-charged exciton emissions, ... More
Quasars around the Seyfert Galaxy NGC3516Dec 02 1997We report redshift measurements of 5 X-ray emitting blue stellar objects (BSO's) located less than 12 arc min from the X-ray Seyfert galaxy, NGC 3516. We find these quasars to be distributed along the minor axis of the galaxy and to show a very good correlation ... More
Candidate Milky Way Satellites in the Galactic HaloDec 07 2006Oct 19 2007Sloan Digital Sky Survey (SDSS) DR5 photometric data with $120^{\circ} < \alpha < 270^{\circ}$, $25^{\circ} < \delta < 70^{\circ}$ are searched for new Milky Way companions or substructures in the Galactic halo. Five candidates are identified as overdensities ... More
Hydrogen in Ag-doped ZnO: theoretical calculationsMay 08 2009Based on density functional theory calculations, we systematically investigate the behaviors of a H atom in Ag-doped ZnO, involving the preference sites, diffusion behaviors, the electronic structures and vibrational properties. We find that a H atom ... More
Probing cosmic acceleration by strong gravitational lensing systemsJan 26 2019Recently, some divergent conclusions about cosmic acceleration were obtained using type Ia supernovae (SNe Ia), with opposite assumptions on the intrinsic luminosity evolution. In this paper, we use strong gravitational lensing systems to probe the cosmic ... More
Measuring the mode volume of plasmonic nanocavities using coupled optical emittersJul 04 2012Metallic optical systems can confine light to deep sub-wavelength dimensions, but verifying the level of confinement at these length scales typically requires specialized techniques and equipment for probing the near-field of the structure. We experimentally ... More
Generating entanglement with low Q-factor microcavitiesAug 02 2012We propose a method of generating entanglement using single photons and electron spins in the regime of resonance scattering. The technique involves matching the spontaneous emission rate of the spin dipole transition in bulk dielectric to the modified ... More
Feedback Limits Rapid Growth of Seed Black Holes at High RedshiftDec 17 2005Seed black holes formed in the collapse of population III stars have been invoked to explain the presence of supermassive black holes at high redshift. It has been suggested that a seed black hole can grow up to $10^{5\sim 6}\sunm$ through highly super-Eddington ... More
Electric field Control of Exchange Bias by Resistive SwitchingOct 05 2017We demonstrated an electric field controlled exchange bias (EB) effect accompanied with unipolar resistive switching behavior in the Si/SiO2/Pt/Co/NiO/Pt device. By applying certain voltages, the device displays obvious EB in high-resistance-state while ... More
Spectrum Analysis of the Type Ib Supernova 1999dn: Probable Identifications of C II and H-alphaMay 15 2000Low resolution spectra of SN 1999dn at early times are presented and compared with synthetic spectra generated with the parameterized supernova synthetic-spectrum code SYNOW. We find that the spectra of SN 1999dn strongly resemble those of SN 1997X and ... More
Cache-enabled Wireless Networks with Opportunistic Interference AlignmentJun 27 2017Both caching and interference alignment (IA) are promising techniques for future wireless networks. Nevertheless, most of existing works on cache-enabled IA wireless networks assume that the channel is invariant, which is unrealistic considering the time-varying ... More
GRB 070518: A Gamma-ray Burst with Optically Dim LuminosityNov 05 2009We present our optical observations of {\em Swift} GRB 070518 afterglow obtained at the 0.8-m Tsinghua University-National Astronomical Observatory of China telescope (TNT) at Xinglong Observatory. Our follow-up observations were performed from 512 sec ... More
Control of the magnon-photon level attraction in a planar cavityJan 22 2019A resistive coupling circuit is used to model the recently discovered dissipative coupling in a hybridized cavity photon-magnon system. With this model as a basis we have designed a planar cavity in which a controllable transition between level attraction ... More
Form Factor Fit for e^+e^- to pi^+pi^-pi^+pi^-Dec 21 2005Jul 04 2006The cross section of e^+e^- to pi^+pi^-pi^+pi^- has been measured by BABAR collaboration. We apply the theoretical cross section deduced from the extended VMD (VectorMeson Dominance) model to fit these experimental data. The relevant parameters and the ... More
SDSS J121811.0+465501.2: a new Low Surface Brightness Galaxy with low metallicityMay 15 2007We serendipitously find a new nearby Low Surface Brightness (LSB) galaxy from SDSS database. We estimate oxygen abundance of its H II region SDSS J121811.0+465501.2 from electron temperature, as well as for another H II region, SDSS J135440.5+535309.6, ... More
Deterministically entangling distant nitrogen-vacancy centers by a nanomechanical cantileverJul 31 2009Aug 27 2009We present a practical scheme by global addressing to deterministically entangle negatively charged nitrogen-vacancy (N-V) centers in distant diamonds using a nano-mechanical cantilever with the magnetic tips strongly coupled to the N-V electron spins. ... More
A High Peculiarity Rate for Type Ia SNeDec 16 1999We have compiled a sample of 90 SNe Ia from 1997 to 1999 (up to SN 1999da) and studied the peculiarity rate of SN 1991T, SN 1991bg and SN 1986G-like objects. A Monte Carlo code is written to study the observational biases involved in the evaluation of ... More
A fiber based diamond RF B-field sensor and characterization of a small helical antennaSep 12 2018We present a microwave B-field scanning imaging technique using diamond micro-crystal containing nitrogen vacancy center that is attached to a fiber tip. We propose a pulsed modulation technique, enabling the implementation of a variety of pulsed quantum ... More
Doppler broadening thermometry based on cavity ring-down spectroscopyFeb 05 2015Jul 22 2015A Doppler broadening thermometry (DBT) instrument is built based on cavity ring-down spectroscopy (CRDS) for precise determination of the Boltzmann constant. Compared with conventional direct absorption methods, the high-sensitivity of CRDS allows to ... More
Deterministic Generation of Entangled Photons in Superconducting Resonator ArraysApr 13 2010Jul 22 2011We present a scheme for the deterministic generation of entangled photon pairs in a superconducting resonator array. The resonators form a Jaynes-Cummings lattice via the coupling to superconducting qubits, and the Kerr-like nonlinearity arises due to ... More
Constraints on the Global Structure of Magnetic Clouds: Transverse Size and CurvatureMay 31 2006Aug 21 2006We present direct evidence that magnetic clouds (MCs) have highly flattened and curved cross section resulting from their interaction with the ambient solar wind. Lower limits on the transverse size are obtained for three MCs observed by ACE and Ulysses ... More
The entanglement beam splitter: a quantum-dot spin in a double-sided optical microcavityOct 23 2009We propose an entanglement beam splitter (EBS) using a quantum-dot spin in a double-sided optical microcavity. In contrast to the conventional optical beam splitter, the EBS can directly split a photon-spin product state into two constituent entangled ... More
Robust photon-spin entangling gate using a quantum-dot spin in a microcavityJan 26 2009Semiconductor quantum dots (known as artificial atoms) hold great promise for solid-state quantum networks and quantum computers. To realize a quantum network, it is crucial to achieve light-matter entanglement and coherent quantum-state transfer between ... More
U(1) Connection, Nonlinear Dirac-like Equations and Seiberg-Witten EquationsJan 22 2000By analysing the work of Campolattaro we argue that the second Seiberg-Witten equation over the Spin^c_4 manifold, i.e., F^+_{ij}=< M,S_ij M >, is the generalization of the Campolattaro's description of the electromagnetic field tensor F^{\mu\nu} in the ... More
Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$Dec 06 2016Measurements of the current-voltage characteristics were performed on Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ single crystals with doping level $0.044 \leq x \leq 0.1$. An unconventional increase in the flux-flow resistivity $\rho_{\rm ff}$ with decreasing magnetic ... More
Accumulation of three-body resonances above two-body thresholdsSep 29 2004We calculate resonances in three-body systems with attractive Coulomb potentials by solving the homogeneous Faddeev-Merkuriev integral equations for complex energies. The equations are solved by using the Coulomb-Sturmian separable expansion approach. ... More
Giant optical Faraday rotation induced by a single electron spin in a quantum dot: Applications to entangling remote spins via a single photonAug 15 2007Mar 08 2008We propose a quantum non-demolition method - giant Faraday rotation - to detect a single electron spin in a quantum dot inside a microcavity where negatively-charged exciton strongly couples to the cavity mode. Left- and right-circularly polarized light ... More
Fourfold Symmetry of Anisotropic Magnetoresistance in Epitaxial Fe3O4 Thin FilmsMay 29 2011We studied the angular dependence of anisotropic magnetoresistance (AMR) and Planar Hall effect (PHE) at various temperatures in high quality epitaxial Fe3O4 films grown on MgO(001) substrates. The PHE contains only a twofold angular dependence, but the ... More
Start-to-end simulation of the injector for a compact THz sourceOct 29 2013Terahertz radiation has broad application prospect due to its ability to penetrate deep into many organic materials without damage caused by ionizing radiations. A FEL-based THz source is the best choice to produce high-power radiation. In this paper, ... More
Green's function method for single-particle resonant states in relativistic mean field theorySep 30 2014Relativistic mean field theory is formulated with the Green's function method in coordinate space to investigate the single-particle bound states and resonant states on the same footing. Taking the density of states for free particle as a reference, the ... More
18-Months Operation of Lunar-based Ultraviolet Telescope: A Highly Stable Photometric PerformanceOct 06 2015We here report the photometric performance of Lunar-based Ultraviolet telescope (LUT), the first robotic telescope working on the Moon, for its 18-months operation. In total, 17 IUE standards have been observed in 51 runs until June 2015, which returns ... More
Superconductivity in CaSn3 single crystal with a AuCu3-type structureNov 20 2015We report the superconductivity of the CaSn3 single crystal with a AuCu3-type structure, namely cubic space group Pm3m. The superconducting transition temperature TC=4.2 K is determined by the magnetic susceptibility, electrical resistivity, and heat ... More
An Atlas of z=5.7 and z=6.5 Ly alpha EmittersSep 06 2010We present an atlas of 88 z~5.7 and 30 z~6.5 Ly alpha emitters obtained from a wide-field narrowband survey. We combined deep narrowband imaging in 120A bandpass filters centered at 8150A and 9140A with deep BVRIz broadband imaging to select high-redshift ... More
Detecting the dark matter annihilation at the ground EAS detectorsOct 29 2006Apr 16 2007In this paper we study the possibility of detecting gamma rays from dark matter annihilation in the subhalos of the Milky Way by the ground based EAS detectors within the frame of the minimal supersymmetric standard model. Based on the Monte Carlo simulation ... More
A series representation of the nonlinear equation for axisymmetrical fluid membrane shapeJul 31 2000Aug 01 2000Whatever the fluid lipid vesicle is modeled as the spontaneous-curvature, bilayer-coupling, or the area-difference elasticity, and no matter whether a pulling axial force applied at the vesicle poles or not, a universal shape equation presents when the ... More
Early Growth of Massive Black Holes in QuasarsDec 04 2007Episodic activity of quasars is driving growth of supermassive black holes (SMBHs) via accretion of baryon gas. In this Letter, we develop a simple method to analyse the duty cycle of quasars up to redshift $z\sim 6$ universe from luminosity functions ... More
Quantum coherence in ultrastrong optomechanicsOct 10 2014Jan 08 2015Ultrastrong light-matter interaction in an optomechanical system can result in nonlinear optical effects such as photon blockade. The system-bath couplings in such systems play an essential role in observing these effects. Here we study the quantum coherence ... More
Pinpointing the knee of cosmic rays with diffuse PeV gamma-rays and neutrinosDec 30 2013Oct 10 2014The origin of the knee in cosmic ray spectrum remains to be an unsolved fundamental problem. There are various kinds of models which predict different break positions and the compositions of the knee. In this work, we suggest to use diffuse $\gamma$-rays ... More
Conductance characteristics between a normal metal and a two-dimensional Fulde-Ferrell-Larkin-Ovchinnikov superconductor: the Fulde-Ferrell stateOct 27 2005Jul 31 2006The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state has received renewed interest recently due to the experimental indication of its presence in CeCoIn$_5$, a quasi 2-dimensional (2D) d-wave superconductor. However direct evidence of the spatial variation ... More
Guaranteeing Recoverability via Partially Constrained Transaction LogsJan 19 2019Transaction logging is an essential constituent to guarantee the atomicity and durability in online transaction processing (OLTP) systems. It always has a considerable impact on performance, especially in an in-memory database system. Conventional implementations ... More
Magneto-Coulomb Drag and Hall Drag in Double-Layer Dirac SystemsNov 17 2017We develop a theory of Coulomb drag due to momentum transfer between graphene layers in a strong magnetic field. The theory is intended to apply in systems with disorder that is weak compared to Landau level separation, so that Landau level mixing is ... More
Quantum and classical fluctuation theorems from a decoherent histories, open-system analysisSep 29 2011Jan 02 2012In this paper we present a first-principles analysis of the nonequilibrium work distribution and the free energy difference of a quantum system interacting with a general environment (with arbitrary spectral density and for all temperatures) based on ... More
Heteropolymer Sequence Design and Preferential Solvation of Hydrophilic Monomers: One More Application of Random Energy ModelJan 24 2007In this paper, we study the role of surface of the globule and the role of interactions with the solvent for designed sequence heteropolymers using random energy model (REM). We investigate the ground state energy and surface monomer composition distribution. ... More
Quantum enhanced metrology in the presence of arbitrary lossMay 15 2013Jun 04 2013We introduce the concept of entanglement enhanced interferometry from the viewpoint of the detected photons. The standard quantum limit is achieved when sequentially detected photons are assumed to be in an uncorrelated product state. However when we ... More
Faddeev-Merkuriev equations for resonances in three-body Coulombic systemsJun 19 2002We reconsider the homogeneous Faddeev-Merkuriev integral equations for three-body Coulombic systems with attractive Coulomb interactions and point out that the resonant solutions are contaminated with spurious resonances. The spurious solutions are related ... More
The equilibrium states of open quantum systems in the strong coupling regimeJun 13 2012In this work we investigate the late-time stationary states of open quantum systems coupled to a thermal reservoir in the strong coupling regime. In general such systems do not necessarily relax to a Boltzmann distribution if the coupling to the thermal ... More
Electron-hydrogen scattering in Faddeev-Merkuriev integral equation approachApr 24 2002Electron-hydrogen scattering is studied in the Faddeev-Merkuriev integral equation approach. The equations are solved by using the Coulomb-Sturmian separable expansion technique. We present $S$- and $P$-wave scattering and reactions cross sections up ... More
Soft phonon modes in the vicinity of the structural quantum critical pointApr 26 2017The quasi-skutterudite superconductors $A_3T_4$Sn$_{13}$ ($A$=Sr, Ca; $T$=Ir, Rh, Co) are highly tunable featuring a structural quantum critical point. We construct a temperature-lattice constant phase diagram for these isovalent compounds, establishing ... More
Chemical pressure effect on the optical conductivity of the nodal-line semimetals ZrSi$Y$ ($Y$=S, Se, Te) and ZrGe$Y$ ($Y$=S, Te)Jan 29 2019ZrSiS is a nodal-line semimetal, whose electronic band structure contains a diamond-shaped line of Dirac nodes. We carried out a comparative study on the optical conductivity of ZrSiS and related compounds ZrSiSe, ZrSiTe, ZrGeS, and ZrGeTe by reflectivity ... More
A GRB Follow-up System at the Xinglong Observatory and Detection of the High-Redshift GRB 060927Jun 16 2009A gamma-ray burst (GRB) optical photometric follow-up system at the Xinglong Observatory of National Astronomical Observatories of China (NAOC) has been constructed. It uses the 0.8-m Tsinghua-NAOC Telescope (TNT) and the 1-m EST telescope, and can automatically ... More
Resonant-state solution of the Faddeev-Merkuriev integral equations for three-body systems with Coulomb potentialsJun 07 2001A novel method for calculating resonances in three-body Coulombic systems is proposed. The Faddeev-Merkuriev integral equations are solved by applying the Coulomb-Sturmian separable expansion method. The $e^- e^+ e^-$ S-state resonances up to $n=5$ threshold ... More
Design of an electron gun for terahertz radiation sourceJun 03 2013With the aim to obtain short-pulse bunches with high peak current for a terahertz radiation source, an EC-ITC (External-Cathode Independently Tunable Cells) RF gun was employed. As the external injecting electron source of the ITC RF gun, a gridded DC ... More
Accretion Disks in Active Galactic Nuclei: Gas Supply Driven by Star FormationJul 23 2010Self-gravitating accretion disks collapse to star-forming(SF) regions extending to the inner edge of the dusty torus in active galactic nuclei (AGNs). A full set of equations including feedback of star formation is given to describe the dynamics of the ... More
Suppressed star formation in circumnuclear regions in Seyfert galaxiesApr 18 2007Feedback from black hole activity is widely believed to play a key role in regulating star formation and black hole growth. A long-standing issue is the relation between the star formation and fueling the supermassive black holes in active galactic nuclei ... More
High-fidelity quantum memory using nitrogen-vacancy center ensemble for hybrid quantum computationJun 15 2011We study a hybrid quantum computing system using nitrogen-vacancy center ensemble (NVE) as quantum memory, current-biased Josephson junction (CBJJ) superconducting qubit fabricated in a transmission line resonator (TLR) as quantum computing processor ... More
Spectroscopic signatures of the Larkin-Ovchinnikov state in the conductance characteristics of a normal-metal/superconductor junctionNov 04 2010Jan 24 2012Using a discrete-lattice approach, we calculate the conductance spectra between a normal metal and an s-wave Larkin-Ovchinnikov (LO) superconductor, with the junction interface oriented {\em along} the direction of the order-parameter (OP) modulation. ... More
3D visualization of two-phase flow in the micro-tube by a simple but effective methodApr 26 2009The present study presents a simple but effective method for 3D visualization of the two-phase flow in the micro-tube. An isosceles right-angle prism combined with a mirror located 45^o bevel to the prism is employed to obtain synchronously the front ... More
Resonant-state solution of the Faddeev-Merkuriev integral equations for three-body systems with Coulomb-like potentialsJan 08 2001A novel method for calculating resonances in three-body Coulombic systems is presented. The Faddeev-Merkuriev integral equations are solved by applying the Coulomb-Sturmian separable expansion method. To show the power of the method we calculate resonances ... More
Spin Pumping in Electrodynamically Coupled Magnon-Photon SystemsApr 06 2015We use electrical detection, in combination with microwave transmission, to investigate both resonant and non-resonant magnon-photon coupling at room temperature. Spin pumping in a dynamically coupled magnon-photon system is found to be distinctly different ... More
The starburst-AGN connection: the role of young stellar populations in fueling supermassive black holesMar 11 2009Tracing the star formation history in circumnuclear regions (CNRs) is a key step towards understanding the starburst-AGN connection. However, bright nuclei outshining the entire host galaxy prevent the analysis of the stellar populations of CNRs around ... More
Composition and field tuned magnetism and superconductivity in Nd1-xCexCoIn5Apr 01 2008The Nd1-xCexCoIn5 alloys evolve from local moment magnetism (x = 0) to heavy fermion superconductivity (x =1). Magnetic order is observed over a broad range of x. For a substantial range of x (0.83 <= x <= 0.95) in the temperature - composition phase ... More
Active Galactic Nuclei with Double-peaked Narrow Lines: Are They Dual AGNs?Oct 04 2009Double-peaked [O III]5007, profiles in active galactic nuclei (AGNs) may provide evidence for the existence of dual AGNs, but a good diagnostic for selecting them is currently lacking. Starting from $\sim$ 7000 active galaxies in SDSS DR7, we assemble ... More
Observation of one electron charge in an enhancement-mode InAs single electron transistor at 4.2KSep 28 2005We propose and demonstrate experimentally a novel design of single-electron quantum dots. The structure consists of a narrow band gap quantum well that can undergo a transition from the hole accumulation regime to the electron inversion regime in a single-top-gate ... More
Coherent control of magnon radiative damping with local photon statesFeb 18 2019The collective excitation of ordered spins, known as spin waves or magnons, can in principle radiate by emitting travelling photons to an open system when decaying to the ground state. However, in contrast to the electric dipoles, magnetic dipoles contributed ... More
GRB follow-up observations in the East-Asian regionJun 10 2005In 2004, we established a Japan-Taiwan-China collaboration for GRB study in the East-Asian region. This serves as a valuable addition to the world-wide optical and infrared follow-up network, because the East-Asia region would otherwise be blank. We have ... More
Pathways toward understanding Macroscopic Quantum PhenomenaApr 30 2013Macroscopic quantum phenomena refer to quantum features in objects of `large' sizes, systems with many components or degrees of freedom, organized in ways where they can be identified as macroscopic objects. This emerging field is ushered in by several ... More
Cavity Enhanced Spin Measurement of an NV Centre in DiamondJul 01 2008We propose a high efficiency high fidelity measurement of the ground state spin of a single NV center in diamond, using the effects of cavity quantum electrodynamics. The scheme we propose is based in the one dimensional atom or Purcell regime, removing ... More
Spin Hall Angle Quantification from Spin Pumping and Microwave PhotoresistanceMar 28 2012We present a method to quantify the spin Hall angle (SHA) with spin pumping and microwave photoresistance measurements. With this method, we separate the inverse spin Hall effect (ISHE) from other unwanted effects for permalloy/Pt bilayers using out-of-plane ... More
Chemical Raman Enhancement of Organic Adsorbates on Metal SurfacesNov 08 2010Using a combination of first-principles theory and experiments, we provide a quantitative explanation for chemical contributions to surface-enhanced Raman spectroscopy for a well-studied organic molecule, benzene thiol, chemisorbed on planar Au(111) surfaces. ... More
Pi Berry phase and Zeeman splitting of TaP probed by high field magnetotransport measurementsJul 29 2015The chiral anomaly-induced negative magnetoresistance and non-trivial Berry phase are two fundamental transport properties associated with the topological properties of Weyl fermions. In this work, we report the quantum transport of TaP single crystals ... More
Electronic and magnetic phase diagram in K$_x$Fe$_{2-y}$Se$_2$ superconductorsApr 26 2011The correlation and competition between antiferromagnetism and superconductivity are one of the most fundamental issues in all of high temperature superconductors. The superconductivity in high temperature cuprate superconductors arises from suppressing ... More
Modeling rain-driven overland flow: empirical versus analytical friction terms in the shallow water approximationSep 15 2016Modeling and simulating overland flow fed by rainfall is a common issue in watershed surface hydrology. Modelers have to choose among various friction models when defining their simulation framework. The purpose of this work is to compare the simulation ... More
Toward a determination of the proton-electron mass ratio from the Lamb-dip measurement of HDDec 23 2017Precision spectroscopy of the hydrogen molecule is a test ground of quantum electrodynamics (QED), and may serve for determination of fundamental constants. Using a comb-locked cavity ring-down spectrometer, for the first time, we observed the Lamb-dip ... More
The properties of a large sample of low surface brightness galaxies from SDSSOct 11 2009A large sample of low surface brightness (LSB) disk galaxies is selected from SDSS with B-band central surface brightness mu_0(B) from 22 to 24.5 mag arcsec^(-2). Some of their properties are studied, such as magnitudes, surface brightness, scalelengths, ... More
A possible giant planet orbiting the cataclysmic variable LX SerNov 29 2016LX Ser is a deeply eclipsing cataclysmic variable with an orbital period of $0.^d 1584325$. Sixty two new eclipse times were determined by our observations and the AAVSO International Data base. Combining all available eclipse times, we analyzed the O-C ... More
Spatial resolution measurement of Triple-GEM detector and diffraction imaging test at synchrotron radiationFeb 10 2017A triple-GEM detector with two-dimensional readout is developed. The detector provides high position resolution for powder diffraction experiments at synchrotron radiation. Spatial resolution of the detector is measured in the lab using a 55Fe X-ray source. ... More
A large sample of low surface brightness disc galaxies from the SDSS- II. Metallicities in surface brightness binsApr 21 2010We study the spectroscopic properties of a large sample of Low Surface Brightness galaxies (LSBGs) (with B-band central surface brightness mu0(B)>22 mag arcsec^(-2)) selected from the Sloan Digital Sky Survey Data Release 4 (SDSS-DR4) main galaxy sample. ... More
Witnessing quantum resource conversion within deterministic quantum computation using one pure superconducting qubitJun 14 2018Deterministic quantum computation with one qubit (DQC1) is iconic in highlighting that exponential quantum speedup may be achieved with negligible entanglement. Its discovery catalyzed heated study of general quantum resources, and various conjectures ... More
A possible giant planet orbiting the cataclysmic variable LX SerNov 29 2016Dec 20 2016LX Ser is a deeply eclipsing cataclysmic variable with an orbital period of $0.^d 1584325$. Sixty two new eclipse times were determined by our observations and the AAVSO International Data base. Combining all available eclipse times, we analyzed the O-C ... More
Determining the upper limit of Gamma_{ee} for the Y(4260)Mar 13 2006Jul 31 2006By fitting the R values between 3.7 and 5.0 GeV measured by the BES collaboration, the upper limit of the electron width of the newly discovered resonance Y(4260) is determined to be 580 eV at 90% C.L. Together with the BABAR measurement on the product ... More
Nuclear Inelastic X-Ray Scattering of FeO to 48 GPaJun 13 2001The partial density of vibrational states has been measured for Fe in compressed FeO (w\"ustite) using nuclear resonant inelastic x-ray scattering. Substantial changes have been observed in the overall shape of the density of states close to the magnetic ... More
Relationship between critical current and flux-flow resistivity in the mixed state of Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$Jun 02 2017We studied the temperature and magnetic field dependence of vortex dissipation and critical current in the mixed-state of unconventional superconducting alloys Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ ($0.044 \leq x \leq 0.100$) through current-voltage measurements. ... More
Splitting broad beams into arrays of dissipative spatial solitons by material and virtual gratingsNov 05 2010We elaborate two generic methods for producing two-dimensional (2D) spatial soliton arrays (SSAs) in the framework of the cubic-quintic (CQ) complex Ginzburg-Landau (CGL) model. The first approach deals with a broad beam launched into the dissipative ... More
The Type Ia Supernova 1997br in ESO 576-G40Mar 30 1999The peculiar type Ia supernova SN 1997br in ESO 576-G40 was extensively observed at Beijing Astronomical Observatory and Lick Observatory. In this paper, we present and discuss the BVRI photometry and the spectra collected over 3 months, beginning 9 days ... More
Upper limits on the solar-neutron flux at the Yangbajing neutron monitor from BATSE-detected solar flaresMar 16 2007The purpose of this work is to search the Yangbajing neutron monitor data obtained between 1998 October and 2000 June for solar neutrons associated with solar flares. Using the onset times of 166 BATSE-detected flares with the GOES peak flux (1 -- 8 \AA) ... More
Long-term optical and radio variability of BL LacertaeMay 12 2014Well-sampled optical and radio light curves of BL Lacertae in B, V, R, I bands and 4.8, 8.0, 14.5 GHz from 1968 to 2014 were presented in this paper. A possible $1.26 \pm 0.05$ yr period in optical bands and a $7.50 \pm 0.15$ yr period in radio bands ... More
A large sample of low surface brightness disk galaxies from the SDSS. I: The sample and the stellar populationsSep 18 2008We present the properties of a large sample (12,282) of nearly face-on low surface brightness (LSB) disk galaxies selected from the main galaxy sample of SDSS-DR4. These properties include B-band central surface brightness mu_0(B), scale lengths h, integrated ... More
Coupled valence and spin state transition in (Pr0.7Sm0.3)0.7Ca0.3CoO3Feb 11 2013Mar 04 2013The coupled valence and spin state transition (VSST) taking place in (Pr0.7Sm0.3)0.7Ca0.3CoO3 was investigated by soft x-ray absorption spectroscopy (XAS) experiments carried out at the Pr-M4,5, Co-L2,3, and O-1s edges. This VSST is found to be composed ... More
Extremely large magnetoresistance and the complete determination of the Fermi surface topology in the semimetal ScSbJun 21 2018Aug 07 2018We report the magnetoresistance of ScSb, which is a semimetal with a simple rocksalt-type structure. We found that the magnetoresistance reaches $\sim$28000 % at 2 K and 14 T in our best sample, and it exhibits a resistivity plateau at low temperatures. ... More