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Final-State Interactions in Heavy Quark DecaysMay 22 1997We study the role played by the final-state interactions (fsi) in heavy quark decays using Pomeron and Regge exchanges to describe high energy scattering. At center of mass energy $\sqrt{s}\sim 5GeV $, Pomeron dominance does not apply. We study the behavior ... More

CP Asymmetries in Single Isospin Channels in B Decays and the Role of Inelastic Final State InteractionsFeb 07 1997Feb 11 1997The role of inelastic final state interactions in CP asymmetries is investigated in single isospin two-body hadronic decays of the B meson. We demonstrate that in a channel where the CP asymmetry vanishes in absence of inelastic final state interactions, ... More

Direct CP Violation Asymmetries in Exclusive B Decays in a Bethe-Salpeter ApproachDec 18 1996Feb 11 1997CP asymmetry in some exclusive decays of charged B meson are calculated in a Bethe-Salpeter approach. Hadronic final state interactions are ignored. Complex decay amplitudes are assumed to arise entirely from perturbative quark-antiquark loops. Calculations ... More

Inelastic Final-State Interactions and Two-body Hadronic B decays into Single-Isospin channelsOct 07 1997The role of inelastic final-state interactions in CP asymmetries and branching ratios is investigated in certain chosen single isospin two-body hadronic B decays. Treating final-state interactions through Pomeron and Regge exchanges, we demonstrate that ... More

Pattern formation of indirect excitons in coupled quantum wellsApr 25 2006Jul 30 2007Using a nonlinear Schr\"odinger equation including short-range two-body attraction and three-body repulsion, we investigate the spatial distribution of indirect excitons in semiconductor coupled quantum wells. The results obtained can interpret the experimental ... More

Theoretical modeling of spatial and temperature dependent exciton energy in coupled quantum wellsMar 15 2011Motivated by a recent experiment of spatial and temperature dependent average exciton energy distribution in coupled quantum wells [S. Yang \textit{et al.}, Phys. Rev. B \textbf{75}, 033311 (2007)], we investigate the nature of the interactions in indirect ... More

Electric-Field-Induced Phase Separation and Labyrinthine Patterns in NanocolloidsMay 24 2001In this paper we report universal labyrinthine patterns observed in nanocolloids originated from electric-field-induced phase separation. For nanocolloids consisting of magnetic particles (magnetic fluids), the labyrinthine pattern as the result of the ... More

Chiral phase transition in a lattice fermion--gauge--scalar model with U(1) gauge symmetryMay 18 1995The chiral phase transition induced by a charged scalar field is investigated numerically in a lattice fermion-gauge-scalar model with U(1) gauge symmetry, proposed recently as a model for dynamical fermion mass generation. For very strong gauge coupling ... More

Hunting for Orphaned Central Compact Objects among Radio PulsarsJul 20 2015Central compact objects (CCOs) are a handful of young neutron stars found at the center of supernova remnants (SNRs). They show high thermal X-ray luminosities but no radio emission. Spin-down rate measurements of the three CCOs with X-ray pulsations ... More

Integrated structural and functional optical imaging combining spectral-domain optical coherence and multiphoton microscopyDec 17 2005An integrated microscope that combines different optical techniques for simultaneous imaging is demonstrated. The microscope enables spectral-domain optical coherence microscopy based on optical backscatter, and multi-photon microscopy for the detection ... More

Beam-beam observations in the RHICOct 22 2014The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory has been in operation since 2000. Over the past decade, the luminosity in the polarized proton (p-p) operations has increased by more than one order of magnitude. The maximum ... More

Theory of Raman scattering on electron-doped high-$T_c$ superconductorDec 08 2005May 24 2006We have analyzed the $B_{1g}$ and $B_{2g}$ Raman spectra of electron-doped cuprate superconductors Nd$_{2-x}$Ce$_{x}$CuO$_4$ and Pr$_{2-x}$Ce$_{x}$CuO$_4$ using a weakly coupled two-band model. One of these two bands is centered around $(\pm \pi/2, \pm ... More

Interplay between periodicity and nonlinearity of indirect excitons in coupled quantum wellsMar 01 2012Inspired by a recent experiment of localization-delocalization transition (LDT) of indirect excitons in lateral electrostatic lattices [M. Remeika \textit{et al.}, Phys. Rev. Lett. \textbf{102}, 186803 (2009)], we investigate the interplay between periodic ... More

W state generation and effect of cavity photons on the purification of dot-like single quantum well excitonsOct 10 2004Oct 19 2004A scheme of three-particle entanglement purification is presented in this work. The physical system undertaken for investigation is dot-like single quantum well excitons independently coupled through a single microcavity mode. The theoretical framework ... More

Resistivity measurements unveil microscopic properties of CrAsDec 24 2018We report resistivity measurements of a CrAs single crystal in a wide temperature range, with the specific aim to assess the applicability of the Bloch-Gruneisen formula for electron-phonon resistivity. We find that the resistance reaches a residual value ... More

Generalizing the Abundancy of an IntegerMar 28 2018Jan 21 2019The abundancy index of a positive integer is the ratio between the sum of its divisors and itself. We generalize previous results on abundancy indices by defining a two-variable abundancy index function as $I(x,n)\colon\mathbb{Z^+}\times\mathbb{Z^+}\to\mathbb{Q}$ ... More

Ultraviolet/X-ray variability and the extended X-ray emission of the radio-loud broad absorption line quasar PG 1004+130May 05 2015We present the results of recent Chandra, XMM-Newton, and Hubble Space Telescope observations of the radio-loud (RL), broad absorption line (BAL) quasar PG 1004+130. We compare our new observations to archival X-ray and UV data, creating the most comprehensive, ... More

Effect of cavity photons on the generation of multi-particle entanglementJan 23 2005Jan 25 2005A study on the cause of the multi-particle entanglement is presented in this work. We investigate how dot-like single quantum well excitons, which are independently coupled through a single microcavity mode, evolve into maximally entangled state as a ... More

Polarization squeezing and multipartite entanglement of triphoton statesMar 14 2010Based upon standard angular momentum theory, we develop a framework to investigate polarization squeezing and multipartite entanglement of a quantum light field. Both mean polarization and variances of the Stokes parameters are obtained analytically, ... More

Inverse of magnetic dipole field using a reversible jump Markov chain Monte CarloOct 03 2013We consider a three-dimensional magnetic field produced by an arbitrary collection of dipoles. Assuming the magnetic vector or its gradient tensor field is measured above the earth surface, the inverse problem is to use the measurement data to find the ... More

Photo-transmutation of long-lived radionuclide Cs-135 by laser-plasma driven electron sourceJan 13 2016Relativistic electrons, accelerated by the laser ponderomotive force, can be focused onto a high-Z convertor to generate high-brightness beams of gamma-rays, which in turn can be used to induce photonuclear reactions. In this work, the possibility of ... More

Cross Layer Provision of Future Cellular NetworksJul 05 2014To cope with the growing demand for wireless data and to extend service coverage, future 5G networks will increasingly rely on the use of low powered nodes to support massive connectivity in diverse set of applications and services [1]. To this end, virtualized ... More

Fragmentation fractions of two-body b-baryon decaysOct 07 2015We study the fragmentation fractions $(f_{{\bf B}_b})$ of the $b$-quark to b-baryons (${\bf B}_b$). By the assumption of $f_{\Lambda_b}/(f_u+f_d)=0.25\pm 0.15$ in accordance with the measurements by LEP, CDF and LHCb Collaborations, we estimate that $f_{\Lambda_b}=0.175\pm ... More

Chiral topological excitons in the monolayer transition metal dichalcogenidesMar 30 2017We theoretically investigate the chiral topological excitons emerging in the monolayer transition metal dichalcogenides, where a bulk energy gap of valley excitons is opened up by a position dependent external magnetic field. We find two emerging chiral ... More

Scanning tunneling microscopy of the 32 K superconductor (Sr1-xKx)Fe2As2Jun 26 2008Jun 28 2008The discovery of high temperature superconductivity in La[O1-xFx]FeAs at the beginning of this year [1] has generated much excitement and has led to the rapid discovery of similar compounds with as high as 55 K transition temperatures [2]. The high superconducting ... More

Disorder-induced significant enhancement in magnetization of ball-milled Fe2CrGa alloyMar 20 2013A new disordered atom configuration in Fe2CrGa alloy has been created by ball-milling method. This leads to a significant enhancement of the magnetic moment up to 3.2~3.9 {\mu}B and an increase of Curie temperature by about 200 K, compared with the arc-melt ... More

Temperature dependence of the paramagnetic spin excitations in BaFe$_2$As$_2$Sep 27 2012We use inelastic neutron scattering to study temperature dependence of the paramagnetic spin excitations in iron pnictide BaFe$_2$As$_2$ throughout the Brillouin zone. In contrast to a conventional local moment Heisenberg system, where paramagnetic spin ... More

Weakly Circle-Preserving Maps in Inversive GeometryAug 08 2013Let S^n be the standard n-sphere embedded in R^{n+1}. A mapping T: S^n \to S^n, not assumed continuous or even measurable, nor injective, is called weakly circle-preserving if the image of any circle under T is contained in some circle in the range space ... More

Colorings of the n-sphere and inversive geometryJul 19 2013This paper shows that in dimensions n \geq 2 for any partition of the set of points in the standard n-sphere \sum_{i=0}^n x_i^2 =1 in R^{n+1} into (n+3) or more nonempty sets, there exists a hyperplane in R^{n+1} that intersects at least (n+2) of these ... More

Topological defects at octahedral tilting plethora in bi-layered perovskitesJun 03 2016Jun 23 2016Oxygen octahedral distortions including tilts/rotations, deformations and off-centering in (layered) perovskites play the key role in their numerous functional properties. At the polar-centrosymmetric phase boundary in bi-layered perovskite Ca3-xSrxTi2O7 ... More

Transmutation prospect of long-lived nuclear waste induced by high-charge electron beam from laser plasma acceleratorMay 16 2017Photo-transmutation of long-lived nuclear waste induced by high-charge relativistic electron beam (e-beam) from laser plasma accelerator is demonstrated. Collimated relativistic e-beam with a high charge of approximately 100 nC is produced from high-intensity ... More

Moser's Shadow ProblemOct 16 2013Sep 09 2015Moser's shadow problem asks to estimate the shadow function $\mathfrak{s}_{b}(n)$ giving the minimal value with the property that for each bounded convex polyhedron $P$ in $3$-space with $n$ vertices there is some direction v (depending on P) such that ... More

Scaling limits of a model for selection at two scalesJul 02 2015The dynamics of a population undergoing selection is a central topic in evolutionary biology. This question is particularly intriguing in the case where selective forces act in opposing directions at two population scales. For example, a fast-replicating ... More

Nematic spin fluid in the tetragonal phase of BaFe2As2Nov 16 2010Magnetic interactions are generally believed to play a key role in mediating electron pairing for superconductivity in iron arsenides; yet their character is only partially understood. Experimentally, the antiferromagnetic (AF) transition is always preceded ... More

Gamma-Rays and Neutrinos from Very Young Supernova RemnantsMar 07 1997Sep 04 1997We consider the result of acceleration of heavy ions in the slot gap potential of a very young pulsar with a hot polar cap. Photodisintegration of the heavy ions in the radiation field of the polar cap and pulsar surface gives rise to a flux of energetic ... More

Moment Angle Complexes and Big Cohen-MacaulaynessMay 08 2012Jun 11 2012Let Z_K be the moment angle complex associated to a simplicial complex K, with the canonical torus T-action. In this paper, we prove that, for any possibly disconnected subgroup G of T, G-equivariant cohomology of Z_K over the integer Z is isomophic to ... More

Spin Waves in Detwinned BaFe$_2$As$_2$Jul 04 2018Understanding magnetic interactions in the parent compounds of high-temperature superconductors forms the basis for determining their role for the mechanism of superconductivity. For parent compounds of iron pnictide superconductors such as $A$Fe$_2$As$_2$ ... More

Mott transition and collective charge pinning in electron doped Sr2IrO4Jun 18 2018We studied the in-plane dynamic and static charge conductivity of electron doped Sr2IrO4 using optical spectroscopy and DC transport measurements. The optical conductivity indicates that the pristine material is an indirect semiconductor with a direct ... More

Phylogenetic analysis of gene expressionFeb 13 2013Phylogenetic analyses of gene expression have great potential for addressing a wide range of questions. These analyses will, for example, identify genes that have evolutionary shifts in expression that are correlated with evolutionary changes in morphological, ... More

Magnetic evolution of Spinel Mn1-xZnxCr2O4 single crystalsFeb 26 2016Mn1-xZnxCr2O4 (0<x<1) single crystals have been grown by the chemical vapor transport (CVT) method. The crystallographic, magnetic, and thermal transport properties of the single crystals were investigated by the room-temperature X-ray diffraction, magnetization ... More

On the Optimum Cyclic Subcode Chains of $\mathcal{RM}(2,m)^*$ for Increasing Message LengthJun 04 2013The distance profiles of linear block codes can be employed to design variational coding scheme for encoding message with variational length and getting lower decoding error probability by large minimum Hamming distance. %, e.g. the design of TFCI in ... More

THz Generation and Detection on Dirac Fermions in Topological InsulatorsJan 26 2013This study shows that a terahertz (THz) wave can be generated from the (001) surface of cleaved Bi$_{\textrm{2}}$Se$_{\textrm{3}}$ and Cu-doped Bi$_{\textrm{2}}$Se$_{\textrm{3}}$ single crystals using 800 nm femtosecond pulses. The generated THz power ... More

Coordinated Multicell Multicast Beamforming Based on Manifold OptimizationJul 12 2017Multicast beamforming is a key technology for next-generation wireless cellular networks to support high-rate content distribution services. In this paper, the coordinated downlink multicast beamforming design in multicell networks is considered. The ... More

Superconductivity enhancement in the S-doped Weyl semimetal candidate MoTe2Dec 27 2015Dec 29 2015Two-dimensional (2D) transition-metal dichalcogenide (TMDs) MoTe2 has attracted much attention due to its predicted Weyl semimetal (WSM) state and a quantum spin Hall insulator in bulk and monolayer form, respectively. We find that the superconductivity ... More

Study of Relay Selection for Physical-Layer Security in Buffer-Aided Relay Networks Based on the Secrecy Rate CriterionMay 15 2016In this paper, we investigate an opportunistic relay and jammer scheme along with relay selection algorithms based on the secrecy rate criterion in multiple-input multiple-output buffer-aided down link relay networks, which consist of one source, a number ... More

Joint Multicast Beamforming and User Scheduling in Large-scale Antenna SystemsJul 12 2017This paper studies the joint multicast beamforming and user scheduling problem, with the objective of minimizing total transmitting power across multiple channels by jointly assigning each user to appropriate channel and designing multicast beamformer ... More

Threshold concentration for H blistering in defect free WJan 15 2011Lattice distortion induced by high concentration of H is believed to be precursor of H blistering in single crystalline W (SCW) during H isotope irradiation. However, the critical H concentration needed to trigger bond-breaking of metal atoms presents ... More

Moser's Shadow ProblemOct 16 2013Jul 17 2018Moser's shadow problem asks to estimate the shadow function $\mathfrak{s}_b(n)$, which is the largest number such that for each bounded convex polyhedron $P$ with $n$ vertices in $3$-space there is some direction ${\bf v}$ (depending on $P$) such that, ... More

Disordered Kondo Nanoclusters: Effect of Energy SpacingJul 19 2003Exact diagonalization results for Kondo nanoclusters alloyed with mixed valence impurities show that tuning the {\it energy spacing}, $\Delta$, drives the system from the Kondo to the RKKY regime. The interplay of $\Delta$ and disorder gives rise to a ... More

A note on Gaussian correlation inequalities for nonsymmetric setsNov 18 2010We consider the Gaussian correlation inequality for nonsymmetric convex sets. More precisely, if $A\subset\mathbb{R}^d$ is convex and the origin $0\in A$, then for any ball $B$ centered at the origin, it holds $\gamma_d(A\cap B)\geq \gamma_d(A)\gamma_d(B)$, ... More

Using a hydrogen-bond index to predict the gene-silencing efficiency of siRNA based on the local structure of mRNAOct 20 2017The gene silencing effect of short interfering RNA (siRNA) is known to vary strongly with the targeted position of the mRNA. A number of hypotheses have been suggested to explain this phenomenon. We would like to test if this positional effect is mainly ... More

Estimating medical costs from a transition modelMay 16 2008Nonparametric estimators of the mean total cost have been proposed in a variety of settings. In clinical trials it is generally impractical to follow up patients until all have responded, and therefore censoring of patient outcomes and total cost will ... More

Tuning the magnetism of ordered and disordered strongly-correlated electron nanoclustersJun 09 2004Recently, there has been a resurgence of intense experimental and theoretical interest on the Kondo physics of nanoscopic and mesoscopic systems due to the possibility of making experiments in extremely small samples. We have carried out exact diagonalization ... More

Magnetic and transport properties in Gd$_{1-x}$Sr$_x$CoO$_{3}$ ($x$= 0.10-0.70)Jan 24 2005Mar 28 2006Magnetic and transport properties of polycrystalline Gd$_{1-x}$Sr$_x$CoO$_{3}$ ($x$= 0.10-0.70) are investigated systemically. Cluster-glass magnetism for $x \leq$ 0.45 and long-range ferromagnetic order in higher doping level are observed. Transport ... More

Variability Selected Low-Luminosity Active Galactic Nuclei in the 4 Ms Chandra Deep Field-SouthJan 20 2012The 4 Ms Chandra Deep Field-South (CDF-S) and other deep X-ray surveys have been highly effective at selecting active galactic nuclei (AGN). However, cosmologically distant low-luminosity AGN (LLAGN) have remained a challenge to identify due to significant ... More

Radiation pressure, absorption and AGN feedback in the Chandra Deep FieldsJun 23 2010The presence of absorbing gas around the central engine of Active Galactic Nuclei (AGN) is a common feature of these objects. Recent work has looked at the effect of the dust component of the gas, and how it enhances radiation pressure such that dusty ... More

Spatial Symmetry of Superconducting Gap in YBa2Cu3O7-δObtained from Femtosecond SpectroscopyNov 19 2003Nov 25 2003The polarized femtosecond spectroscopies obtained from well characterized (100) and (110) YBa2Cu3O7-\delta thin films are reported. This bulk-sensitive spectroscopy, combining with the well-textured samples, serves as an effective probe to quasiparticle ... More

Tunable "Doniach Phase Diagram" for strongly-correlated nanoclustersApr 29 2004Exact diagonalization calculations reveal that the energy spacing $\Delta$ in the conduction band tunes the interplay between the {\it local} Kondo and {\it non local} RKKY interactions, giving rise to a "Doniach phase diagram" for a nanocluster with ... More

Distribution of energetic oxygen and hydrogen in the near-Earth plasma sheetJun 06 2016The spatial distributions of different ion species are useful indicators for plasma sheet dynamics. In this statistical study based on 7 years of Cluster observations, we establish the spatial distributions of oxygen ions and protons at energies from ... More

Anomalous Magnetoresistance in Pb-doped Bi$_2$Sr$_2$Co$_2$O$_y$ Single CrystalsDec 22 2004Magnetoresistance (MR) of the Bi$_{2-x}$Pb$_x$Sr$_2$Co$_2$O$_y$ ($x$=0, 0.3, 0.4) single crystals is investigated systematically. A nonmonotonic variation of the isothermal in-plane and out-of-plane MR with the field is observed. The out-of-plane MR is ... More

Intrinsic Correlations for Flaring Blazars Detected by FermiFeb 19 2017Blazars are an extreme subclass of active galactic nuclei. Their rapid variability, luminous brightness, superluminal motion, and high and variable polarization are probably due to a beaming effect. However, this beaming factor (or Doppler factor) is ... More

The electronic structure of poly(pyridine-2,5-diyl) investigated by soft x-ray absorption and emission spectroscopiesJan 05 2012The electronic structure of the poly-pyridine conjugated polymer has been investigated by resonant and nonresonant inelastic X-ray scattering and X-ray absorption spectroscopies using synchrotron radiation. The measurements were made for both the carbon ... More

Spatially-resolved relaxation dynamics of photoinduced quasiparticles in underdoped YBa$sub 2$Cu$sub 3$O$sub {7-delta}$Aug 20 2005The spatially-resolved relaxation characteristics of photoinduced quasiparticles (QPs) in CuO$sub 2$ planes of underdoped YBCO are disclosed by polarized fs time-resolved spectroscopy. The relaxation time (tau) along b axis diverges at Tc, and appears ... More

Asymptotic estimates on the time derivative of entropy on a Riemannian manifoldNov 17 2010Nov 22 2010We consider the entropy of the solution to the heat equation on a Riemannian manifold. When the manifold is compact, we provide two estimates on the rate of change of the entropy in terms of the lower bound on the Ricci curvature and the spectral gap ... More

Zero-temperature Phase Diagram For Strongly-Correlated NanochainsFeb 11 2004Recently there has been a resurgence of intense experimental and theoretical interest on the Kondo physics of nanoscopic and mesoscopic systems due to the possibility of making experiments in extremely small samples. We have carried out exact diagonalization ... More

Microscopic Study of Superdeformed Rotational Bands in 151TbDec 17 1996Structure of eight superdeformed bands in the nucleus 151Tb is analyzed using the results of the Hartree-Fock and Woods-Saxon cranking approaches. It is demonstrated that far going similarities between the two approaches exist and predictions related ... More

Magnetic Order of the Iron Spins in NdOFeAsJul 04 2008Aug 22 2008Polarized and unpolarized neutron diffraction measurements have been carried out to investigate the iron magnetic order in undoped NdOFeAs. Antiferromagnetic order is observed below 141(6) K, which is in close proximity to the structural distortion observed ... More

Supermassive Black Hole Growth in Starburst Galaxies over Cosmic Time: Constraints from the Deepest Chandra FieldsAug 16 2011We present an analysis of deep multiwavelength data for z ~ 0.3-3 starburst galaxies selected by their 70 um emission in the Extended-Chandra Deep Field-South and Extended Groth Strip. We identify active galactic nuclei (AGNs) in these infrared sources ... More

Homogeneous vs. inhomogeneous coexistence of magnetic order and superconductivity probed by NMR in Co and K doped iron pnictidesJun 19 2009In Ba(Fe0.95Co0.05)2As2 all of the 75As NMR intensity at the paramagnetic resonance position vanishes abruptly below Tonset(SDW)=56 K, indicating that magnetic (spin density wave) order is present in all of the sample volume, despite bulk superconductivity ... More

Resonant inelastic soft-x-ray scattering spectra at the N1s and C1s edges of poly(pyridine-2,5-diyl)Jan 05 2012Resonant inelastic scattering measurements of poly(pyridine-2,5-diyl) have been performed at the N1s and C1s edges using synchrotron radiation. For comparison, molecular orbital calculations of the spectra have been carried out with the repeat unit as ... More

Weak Hard X-ray Emission from Two Broad Absorption Line Quasars Observed with NuSTAR: Compton-thick Absorption or Intrinsic X-ray Weakness?Jun 14 2013We present NuSTAR hard X-ray observations of two X-ray weak broad absorption line (BAL) quasars, PG 1004+130 (radio loud) and PG 1700+518 (radio quiet). Many BAL quasars appear X-ray weak, probably due to absorption by the shielding gas between the nucleus ... More

Nernst effect of the new iron-based superconductor LaO$_{1-x}$F$_{x}$FeAsApr 08 2008May 29 2008We report the first Nernst effect measurement on the new iron-based superconductor LaO$_{1-x}$F$_{x}$FeAs $(x=0.1)$. In the normal state, the Nernst signal is negative and very small. Below $T_{c}$ a large positive peak caused by vortex motion is observed. ... More

Critical behavior of two-dimensional intrinsically ferromagnetic semiconductor CrI3Jan 30 2018CrI3, which belongs to a rare category of two-dimensional (2D) ferromagnetic semiconductors, is of great interest for spintronic device applications. Unlike CrCl3 whose magnetism presents a 2D-Heisenberg behavior, CrI3 exhibits a larger van der Waals ... More

Multistage Coupling of Laser-Wakefield Accelerators with Curved Plasma ChannelDec 25 2017Multistage coupling of laser-wakefield accelerators is essential to overcome laser energy depletion for high-energy applications such as TeV level electron-positron colliders. Current staging schemes feed subsequent laser pulses into stages using plasma ... More

Novel magnetic ground state in a fractional-valence-state iridateMar 20 2018The fractional or non-integer valence state in 3d and 4d transition metal oxides always gives rise to novel physics and multifunctional applications, such as charge order, magnetoelectric effect, and double exchange. The ground state becomes even more ... More

1T`-MoTe2 single crystal: a possible topological superconductorFeb 04 2016We measured the magnetoresistvity (MR) properties of the 1T`-MoTe2 single crystal under the magnetic field up to 33 T.By analyzing the Shubnikov de Haas oscillations of MR at the low temperature, single Fermi surface is revealed.From the strong oscillatory ... More

3D visualizations of nano-scale phase separation and ultrafast dynamic correlation between phases in (Na0.32K0.68)0.95Fe1.75Se2Mar 14 2019Phase separation of metallic and antiferromagnetic (AFM) insulating phases in alkaline iron selenides (AxFe2-ySe2) continues to attract intense interest because the relationship between two peculiar features probably is a key to clarifying the pairing ... More

The origin of the turn-on phenomenon in Td-MoTe2Jul 09 2017We did the resistivity and scanning tunneling microscope/spectroscopy (STM/STS) experiments at different temperatures and magnetic fields to investigate the origin of the turn-on (t-o) phenomenon of Td-MoTe2. There are two interesting observations. Firstly, ... More

Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1-xFeAsApr 19 2011Apr 21 2011We use neutron scattering to determine spin excitations in single crystals of nonsuperconducting Li1-xFeAs throughout the Brillouin zone. Although angle resolved photoemission experiments and local density approximation calculations suggest poor Fermi ... More

Observation of Dirac Cone Band Dispersion in FeSe Thin Films by Photoemission SpectroscopyAug 29 2015The electronic structure of FeSe thin films grown on SrTiO3 substrate is studied by angle-resolved photoemission spectroscopy (ARPES). We reveal the existence of Dirac cone band dispersions in FeSe thin films thicker than 1 Unit Cell below the nematic ... More

Unveiling the hidden nematicity and spin subsystem in FeSeMar 29 2016The nematic order is considered one of the essential ingredients to understand the mechanism of Fe-based superconductivity. In most Fe-based superconductors (pnictides), nematicity is reasonably close to the antiferromagnetic order. In FeSe, in contrast, ... More

A liquid helium target system for a measurement of parity violation in neutron spin rotationMay 04 2009Sep 17 2009A liquid helium target system was designed and built to perform a precision measurement of the parity-violating neutron spin rotation in helium due to the nucleon-nucleon weak interaction. The measurement employed a beam of low energy neutrons that passed ... More

Determination of the photodisintegration reaction rates involving charged particles: systematical calculations and proposed measurements based on Extreme Light Infrastructure - Nuclear Physics (ELI-NP)Oct 11 2018Photodisintegration reaction rates involving charged particles are of relevance to the p-process nucleosynthesis that aims at explaining the production of the stable neutron-deficient nuclides heavier than iron. In this study, the cross sections and astrophysical ... More

Structural and electronic phase transitions driven by electric field in metastable MoS$_2$ thin flakeFeb 25 2019Transition-metal-dichalcogenides own a variety of structures as well as electronic properties which can be modulated by structural variations, element substitutions, ion or molecule intercalations, etc. However, there is very limited knowledge on metastable ... More

Unveiling the hidden nematicity and spin subsystem in FeSeMar 29 2016Aug 30 2017The nematic order (nematicity) is considered one of the essential ingredients to understand the mechanism of Fe-based superconductivity. In most Fe-based superconductors (pnictides), nematic order is reasonably close to the antiferromagnetic order. In ... More

Non-stoichiometry effects on the extreme magnetoresistance in Weyl semimetal WTe2Dec 29 2017The extremely large non-saturated magnetoresistance is an unusual property of many semimetals, some of which have topological quantum states. In the present paper, the non-stoichiometry effect on the magnetoresistance is systematically investigated for ... More

The extremely large magnetoresistance in the Candidate Type-II Weyl semimetal MoTe2Jun 11 2017We performed the angle dependent magnetoresistance (MR), Hall effect measurements, the temperature dependent magneto-thermoelectric power (TEP) S(T) measurements, and the first-principles calculations to study the electronic properties of orthorhombic ... More

Direct measurement of the localized-itinerant transition, hybridization and antiferromagnetic transition of 5f electronsNov 24 2016Jul 07 2017In heavy-fermion compounds, f electrons show both itinerant and localized behaviour depending on the external conditions, and the hybridization between localized f electrons and itinerant conduction bands gives rise to their exotic properties like heavy-fermions, ... More

Weak Hard X-ray Emission from Broad Absorption Line Quasars: Evidence for Intrinsic X-ray WeaknessAug 15 2014We report NuSTAR observations of a sample of six X-ray weak broad absorption line (BAL) quasars. These targets, at z=0.148-1.223, are among the optically brightest and most luminous BAL quasars known at z<1.3. However, their rest-frame 2 keV luminosities ... More

Effect of Dzyaloshinskii Moriya interaction on magnetic vortexJan 13 2014The effect of the Dzyaloshinskii Moriya interaction on the vortex in magnetic microdisk was investigated by micro magnetic simulation based on the Landau Lifshitz Gilbert equation. Our results show that the DM interaction modifies the size of the vortex ... More

The hard X-ray emission of the luminous infrared galaxy NGC 6240 as observed by NuSTAROct 15 2015We present a broad-band (~0.3-70 keV) spectral and temporal analysis of NuSTAR observations of the luminous infrared galaxy NGC 6240, combined with archival Chandra, XMM-Newton and BeppoSAX data. NGC 6240 is a galaxy in a relatively early merger state ... More

Magnetic-field enhanced high-thermoelectric performance in topological Dirac semimetal Cd$_3$As$_2$ crystalFeb 22 2018Thermoelectric materials can be used to convert heat to electric power through the Seebeck effect. We study magneto-thermoelectric figure of merit (ZT) in three-dimensional Dirac semimetal Cd$_3$As$_2$ crystal. It is found that enhancement of power factor ... More

LSS-GAC - A LAMOST Spectroscopic Survey of the Galactic Anti-centerJun 23 2013As a major component of the LAMOST Galactic surveys, the LAMOST Spectroscopic Survey of the Galactic Anti-center (LSS-GAC) will survey a significant volume of the Galactic thin/thick disks and halo in a contiguous sky area of ~ 3,400sq.deg., centered ... More

Revealing correlation effect of Co 3d electrons in La$_3$Co$_4$Sn$_{13}$ and Ce$_3$Co$_4$Sn$_{13}$ by infrared spectroscopy studySep 04 2017We report resistivity, specific heat and optical spectroscopy measurements on single crystal samples of La$_3$Co$_4$Sn$_{13}$ and Ce$_3$Co$_4$Sn$_{13}$. We observed clear temperature-induced spectral weight suppression below 4000 \cm for both compounds ... More

The fermi arc and fermi pocket in cuprates in a short-range diagonal stripe phaseSep 01 2012In this paper we studied the fermi arc and the fermi pocket in cuprates in a short-range diagonal stripe phase with wave vectors $(7\pi/8, 7\pi/8)$, which reproduce with a high accuracy the positions and sizes of the fermi arc and fermi pocket and the ... More

Coherent beam-beam experiments and implications for head-on compensationOct 21 2014In polarized proton operation in the Relativistic Heavy Ion Collider (RHIC) coherent beam-beam modes are routinely observed with beam transfer function measurements. These modes can become unstable under external excitation or in the presence of impedance. ... More

Direct measurement of the localized-itinerant transition, hybridization and spin density wave transition of 5f electronsNov 24 2016In heavy-fermion compounds, f electrons show both itinerant and localized behaviour depending on the external conditions, and the hybridization between localized f electrons and itinerant conduction bands gives rise to their exotic properties like heavy-fermions, ... More

Non-stoichiometry effects on the extreme magnetoresistance in Weyl semimetal WTe2Dec 29 2017Apr 30 2018Non-stoichiometry effect on the extreme magnetoresistance is systematically investigated for the Weyl semimetal WTe2. Magnetoresistance and Hall resistivity are measured for the as-grown samples with a slight difference in Te vacancies and the annealed ... More

AGN-Host Connection at 0.5 < z < 2.5: A rapid evolution of AGN fraction in red galaxies during the last 10 GyrDec 09 2016Feb 09 2017We explore the dependence of the incidence of moderate-luminosity ($L_{X} = 10^{41.9-43.7}$ erg s$^{-1}$) AGNs and the distribution of their accretion rates on host color at 0.5 < z < 2.5, using deep X-ray data in GOODS fields. We use extinction-corrected ... More

Tricritical behavior of two-dimensional intrinsic ferromagnetic semiconducting CrGeTe3Jun 10 2017CrGeTe3 recently emerges as a new two-dimensional (2D) ferromagnetic semiconductor that is promising for spintronic device applications. Unlike CrSiTe3 whose magnetism can be understood using the 2D-Ising model, CrGeTe3 exhibits a smaller van der Waals ... More