Results for "Ling Lu"

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Neural Network-Based Abstract Generation for Opinions and ArgumentsJun 09 2016We study the problem of generating abstractive summaries for opinionated text. We propose an attention-based neural network model that is able to absorb information from multiple text units to construct informative, concise, and fluent summaries. An importance-based ... More
Topological one-way fiber of second Chern numberNov 07 2016Optical fiber is a ubiquitous and indispensable component in communications, sensing, biomedicine and many other lightwave technologies and applications. Here we propose topological one-way fibers to remove two fundamental mechanisms that limit fiber ... More
Are Chinese transport policies effective? A new perspective from direct pollution rebound effect, and empirical evidence from road transport sectorOct 25 2016The air pollution has become a serious challenge in China. Emissions from motor vehicles have been found as one main source of air pollution. Although the Chinese government has taken numerous policies to mitigate the harmful emissions from road transport ... More
Fault Tolerant Quantum Random Number Generator Certified by Majorana FermionsMar 26 2013Braiding of Majorana fermions gives accurate topological quantum operations that are intrinsically robust to noise and imperfection, providing a natural method to realize fault-tolerant quantum information processing. Unfortunately, it is known that braiding ... More
Topological Phononic Crystals with One-Way Elastic Edge WavesApr 04 2015We report a new type of phononic crystals with topologically non-trivial bandgaps for both longitudinal and transverse polarizations, resulting in protected one-way elastic edge waves. In our design, gyroscopic inertial effects are used to break the time-reversal ... More
A Mathematical Theory of Optimal Milestoning (with a Detour via Exact Milestoning)Sep 08 2016Mar 12 2017Milestoning is a computational procedure that reduces the dynamics of complex systems to memoryless jumps between intermediates, or milestones, and only retains some information about the probability of these jumps and the time lags between them. Here ... More
Universal Einstein Relation Model in Disordered Organic Semiconductors under Quasi-equilibriumOct 10 2013It is still under debate whether the classical Einstein relation in disordered organic semiconductors is valid. We investigated Einstein relation in disordered organic semiconductors theoretically. The results show that, the classic Einstein relation ... More
Photon scattering from strongly driven atomic ensemblesAug 23 2011The second order correlation function for light emitted from a strongly and near-resonantly driven dilute cloud of atoms is discussed. Because of the strong driving, the fluorescence spectrum separates into distinct peaks, for which the spectral properties ... More
Binary matrices of optimal autocorrelations as alignment marksAug 29 2014We define a new class of binary matrices by maximizing the peak-sidelobe distances in the aperiodic autocorrelations. These matrices can be used as robust position marks for in-plane spatial alignment. The optimal square matrices of dimensions up to 7 ... More
High-dimensional robust precision matrix estimation: Cellwise corruption under $ε$-contaminationSep 24 2015We analyze the statistical consistency of robust estimators for precision matrices in high dimensions. We focus on a contamination mechanism acting cellwise on the data matrix. The estimators we analyze are formed by plugging appropriately chosen robust ... More
Comment on "Linear Scaling of the Exciton Binding Energy versus the Band Gap of Two-Dimensional Materials"Sep 13 2016In a recent letter [J. -H. Choi et al. Phys. Rev. Lett. 115, 066403 (2015)], a universal linear relation between the binding energy Eb of exciton and the band gap Eg is found in different quasi-2D semiconductors. However, when one extrapolates the straight ... More
Uniform Recovery Bounds for Structured Random Matrices in Corrupted Compressed SensingJun 28 2017Feb 07 2018We study the problem of recovering an $s$-sparse signal $\mathbf{x}^{\star}\in\mathbb{C}^n$ from corrupted measurements $\mathbf{y} = \mathbf{A}\mathbf{x}^{\star}+\mathbf{z}^{\star}+\mathbf{w}$, where $\mathbf{z}^{\star}\in\mathbb{C}^m$ is a $k$-sparse ... More
Generalized Gilat-Raubenheimer method for density-of-states calculation in photonic crystalsNov 21 2017Mar 06 2018Efficient numeric algorithm is the key for accurate evaluation of density of states (DOS) in band theory. Gilat-Raubenheimer (GR) method proposed in 1966 is an efficient linear extrapolation method which was limited in specific lattices. Here, using an ... More
Extremely terahertz electric-field enhancement in a high-Q photonic crystal slab cavity with nanoholesJul 25 2018A one-dimensional photonic-crystal (PC) cavity with nanoholes is proposed for extremely enhancing the THz electric fields by utilizing the electromagnetic (EM) boundary conditions, where both slot effect (for the perpendicular component of the electric ... More
Machine learning meets quantum physicsMar 04 2019The marriage of machine learning and quantum physics may give birth to a new research frontier that could transform both.
DIAG-NRE: A Deep Pattern Diagnosis Framework for Distant Supervision Neural Relation ExtractionNov 06 2018Modern neural network models have achieved the state-of-the-art performance on relation extraction (RE) tasks. Although distant supervision (DS) can automatically generate training labels for RE, the effectiveness of DS highly depends on datasets and ... More
Modulated Unit-Norm Tight Frames for Compressed SensingNov 27 2014In this paper, we propose a compressed sensing (CS) framework that consists of three parts: a unit-norm tight frame (UTF), a random diagonal matrix and a column-wise orthonormal matrix. We prove that this structure satisfies the restricted isometry property ... More
Terahertz Probe of Photoexcited Carrier Dynamics in Dirac Semimetal Cd3As2Jul 09 2018The relaxation dynamics of photoexcited quasiparticles of three-dimensional (3D) Dirac semimetals are vital towards their application in high performance electronic and optoelectronic devices. In this work, the relaxation dynamics of photoexcited carriers ... More
Systematic Construction of tight-binding Hamiltonians for Topological Insulators and SuperconductorsNov 05 2013Feb 21 2014A remarkable discovery in recent years is that there exist various kinds of topological insulators and superconductors characterized by a periodic table according to the system symmetry and dimensionality. To physically realize these peculiar phases and ... More
Covert Communication with A Full-Duplex Receiver Based on Channel Distribution InformationOct 12 2018Nov 10 2018In this work, we consider a system of covert communication with the aid of a full-duplex (FD) receiver to enhance the performance in a more realistic scenario, i.e., only the channel distribution information (CDI) rather than channel state information ... More
Hamiltonian tomography for quantum many-body systems with arbitrary couplingsMay 04 2015Oct 04 2015Characterization of qubit couplings in many-body quantum systems is essential for benchmarking quantum computation and simulation. We propose a tomographic measurement scheme to determine all the coupling terms in a general many-body Hamiltonian with ... More
Extremely local electric field enhancement and light confinement in dielectric waveguideOct 09 2013The extremely local electric field enhancement and light confinement is demonstrated in dielectric waveguide with corner and gap geometry. The numerical results reveal the local electric field enhancement in the vicinity of the apex of fan-shaped waveguide. ... More
Dielectric Bow-tie NanocavityOct 09 2013We propose a novel dielectric bow-tie nanocavity consisting of two tip-to-tip opposite triangle semiconductor nanowires, whose end faces are coated by silver nanofilms. Based on the advantages of the dielectric slot and tip structures, and the high reflectivity ... More
Probe of Three-Dimensional Chiral Topological Insulators in an Optical LatticeFeb 05 2014Jul 17 2014We propose a feasible experimental scheme to realize a three-dimensional chiral topological insulator with cold fermionic atoms in an optical lattice, which is characterized by an integer topological invariant distinct from the conventional $Z_2$ topological ... More
A 2D based Partition Strategy for Solving Ranking under Team Context (RTP)Apr 14 2014In this paper, we propose a 2D based partition method for solving the problem of Ranking under Team Context(RTC) on datasets without a priori. We first map the data into 2D space using its minimum and maximum value among all dimensions. Then we construct ... More
Object Selection under Team ContextDec 18 2013Apr 14 2014Context-aware database has drawn increasing attention from both industry and academia recently by taking users' current situation and environment into consideration. However, most of the literature focus on individual context, overlooking the team users. ... More
Atomic Norm Denoising-Based Joint Channel Estimation and Faulty Antenna Detection for Massive MIMOSep 20 2017We consider joint channel estimation and faulty antenna detection for massive multiple-input multiple-output (MIMO) systems operating in time-division duplexing (TDD) mode. For systems with faulty antennas, we show that the impact of faulty antennas on ... More
Deterministic Sequences for Compressive MIMO Channel EstimationNov 02 2013This paper considers the problem of pilot design for compressive multiple-input multiple-output (MIMO) channel estimation. In particular, we are interested in estimating the channels for multiple transmitters simultaneously when the pilot sequences are ... More
Global Adaptive Routing Algorithm Without Additional Congestion Propagation NetworkAug 02 2012Adaptive routing algorithm has been employed in multichip interconnection networks in order to improve network performance. Does a algorithm use local or global network state? This is the key question in adaptive routing. In many traffic patterns, the ... More
Novel high pressure structures and superconductivity of niobium disulfideJan 15 2014We have investigated the pressure-induced phase transition and superconducting properties of niobium disulfide (NbS$_2$) based on the density functional theory. The structures of NbS$_2$ at pressures from 0 to 200 GPa were predicted using the multi-algorithm ... More
Direct Probe of Topological Order for Cold AtomsJul 04 2014Nov 17 2014Cold-atom experiments in optical lattices offer a versatile platform to realize various topological quantum phases. A key challenge in those experiments is to unambiguously probe the topological order. We propose a method to directly measure the characteristic ... More
A Novel Sub-Nyquist Multiband Signal Detection Algorithm for Cognitive RadioFeb 12 2018Wideband spectrum sensing (WSS) is an essential technology for cognitive radio. However, the sampling rate is still a bottleneck of WSS. Several sub-Nyquist sensing methods have been proposed. These technologies deteriorate in the low signal to noise ... More
A Novel Euler's Elastica based Segmentation Approach for Noisy Images via using the Progressive Hedging AlgorithmFeb 20 2019Euler's Elastica based unsupervised segmentation models have strong capability of completing the missing boundaries for existing objects in a clean image, but they are not working well for noisy images. This paper aims to establish a Euler's Elastica ... More
Space-group theory of photonic bandsMay 25 2018Oct 09 2018The wide-range application of photonic crystals and metamaterials benefits from the enormous design space of three-dimensional sub-wavelength structures. In this work, we study the space group constraints on photonic dispersions for all 230 space groups ... More
Personalized Pancreatic Tumor Growth Prediction via Group LearningJun 01 2017Tumor growth prediction, a highly challenging task, has long been viewed as a mathematical modeling problem, where the tumor growth pattern is personalized based on imaging and clinical data of a target patient. Though mathematical models yield promising ... More
Predicted alternative structure for tantalum metal under high pressure and high temperatureJun 03 2013Jul 04 2013First-principles simulations have been performed to investigate the phase stability of tantalum metal under high pressure and high temperature (HPHT). We searched its low-energy structures globally using our developed multi-algorithm collaborative (MAC) ... More
Modified f(G) gravity models with curvature-matter couplingMar 26 2012A modified f(G) gravity model with coupling between matter and geometry is proposed, which is described by the product of the Lagrange density of the matter and an arbitrary function of the Gauss-Bonnet term. The field equations and the equations of motion ... More
An experimental proposal to observe non-abelian statistics of Majorana-Shockley fermions in an optical latticeAug 25 2014We propose an experimental scheme to observe non-abelian statistics with cold atoms in a two dimensional optical lattice. We show that the Majorana-Schockley modes associated with line defects obey non-abelian statistics and can be created, braided, and ... More
Micro Embossing of Ceramic Green Substrates for Micro DevicesMay 07 2008Multilayered ceramic substrates with embedded micro patterns are becoming increasingly important, for example, in harsh environment electronics and microfluidic devices. Fabrication of these embedded micro patterns, such as micro channels, cavities and ... More
Hopf Insulators and Their Topologically Protected Surface StatesJul 27 2013Nov 18 2013Three-dimensional (3D) topological insulators in general need to be protected by certain kinds of symmetries other than the presumed $U(1)$ charge conservation. A peculiar exception is the Hopf insulators which are 3D topological insulators characterized ... More
Planar Object Tracking in the Wild: A BenchmarkMar 23 2017May 22 2018Planar object tracking is an actively studied problem in vision-based robotic applications. While several benchmarks have been constructed for evaluating state-of-the-art algorithms, there is a lack of video sequences captured in the wild rather than ... More
Spatial-Temporal Convolutional LSTMs for Tumor Growth Prediction by Learning 4D Longitudinal Patient DataFeb 23 2019Prognostic tumor growth modeling via medical imaging observations is a challenging yet important problem in precision and predictive medicine. Traditionally, this problem is tackled through mathematical modeling and evaluated using relatively small patient ... More
Self-Learning to Detect and Segment Cysts in Lung CT Images without Manual AnnotationJan 25 2018Image segmentation is a fundamental problem in medical image analysis. In recent years, deep neural networks achieve impressive performances on many medical image segmentation tasks by supervised learning on large manually annotated data. However, expert ... More
Experimental observation of Weyl pointsFeb 11 2015In 1929, Hermann Weyl derived the massless solutions from the Dirac equation - the relativistic wave equation for electrons. Neutrinos were thought, for decades, to be Weyl fermions until the discovery of the neutrino mass. Moreover, it has been suggested ... More
Weyl points in three-dimensional optical lattices: synthetic magnetic monopoles in momentum spaceDec 24 2014We show that Hamiltonians with Weyl points can be realized for ultracold atoms using laser-assisted tunneling in three-dimensional optical lattices. Weyl points are synthetic magnetic monopoles that exhibit a robust, three-dimensional linear dispersion. ... More
Double-Weyl phonons in transition-metal monosilicidesMay 20 2017Topological states of electrons and photons have attracted significant interest recently. Topological mechanical states also being actively explored, have been limited to macroscopic systems of kHz frequency. The discovery of topological phonons of atomic ... More
Thermodynamics of $f(R)$ Gravity with Disformal TransformationFeb 13 2019We study thermodynamics in $f(R)$ gravity with the disformal transformation. The transformation applied to the matter Lagrangian has the form of $\g_{\m\n} = A(\phi,X)g_{\m\n} + B(\phi,X)\pa_\m\f\pa_\n\f$ with the assumption of the Minkowski matter metric ... More
Quantitative analysis on the disparity of regional economic development in China and its evolution from 1952 to 2000Jun 28 2018Domestic and foreign scholars have already done much research on regional disparity and its evolution in China, but there is a big difference in conclusions. What is the reason for this? We think it is mainly due to different analytic approaches, perspectives, ... More
DeepPap: Deep Convolutional Networks for Cervical Cell ClassificationJan 25 2018Automation-assisted cervical screening via Pap smear or liquid-based cytology (LBC) is a highly effective cell imaging based cancer detection tool, where cells are partitioned into "abnormal" and "normal" categories. However, the success of most traditional ... More
An Invisible Metallic MeshSep 30 2015We introduce a solid material that is itself invisible, possessing identical electromagnetic properties as air (i.e. not a cloak) at a desired frequency. Such a material could provide improved mechanical stability, electrical conduction and heat dissipation ... More
Larger-area single-mode photonic crystal surface-emitting lasers enabled by an accidental Dirac pointDec 12 2013By altering the lattice geometry of the photonic crystal surface-emitting lasers (PCSELs), we tune the regular lasing band edges of quadratic dispersions to form a single accidental Dirac point of linear dispersion at the Brillouin zone center. This not ... More
Charge Transport in Hybrid Halide PerovskitesAug 30 2017Oct 25 2017Charge transport is crucial to the performance of hybrid halide perovskite solar cells. A theoretical model based on large polarons is proposed to elucidate charge transport properties in the perovskites. Critical new physical insights are incorporated ... More
Magnetic Domain Wall Engineering in a Nanoscale Permalloy JunctionMay 19 2016Aug 18 2017Nanoscale magnetic junction provides a useful approach to act as the building block for magnetoresistive random access memories (MRAM), where one of the key issues is to control the magnetic domain configuration. Here, we study the domain structure and ... More
Deep Lesion Graphs in the Wild: Relationship Learning and Organization of Significant Radiology Image Findings in a Diverse Large-scale Lesion DatabaseNov 28 2017Jul 28 2018Radiologists in their daily work routinely find and annotate significant abnormalities on a large number of radiology images. Such abnormalities, or lesions, have collected over years and stored in hospitals' picture archiving and communication systems. ... More
Experimental discovery of nodal chainsJun 17 2017Three-dimensional (3D) topological nodal points, such as Weyl and Dirac nodes have attracted wide-spread interest across multiple disciplines and diverse material systems. Unlike nodal points that contain little structural variations, nodal lines can ... More
Topological nature of bound states in the radiation continuumAug 01 2014Bound states in the continuum (BICs) are unusual solutions of wave equations describing light or matter: they are discrete and spatially bounded, but exist at the same energy as a continuum of states which propagate to infinity. Until recently, BICs were ... More
Breaking Out The XML MisMatch TrapAug 12 2012Nov 07 2012In keyword search, when user cannot get what she wants, query refinement is needed and reason can be various. We first give a thorough categorization of the reason, then focus on solving one category of query refinement problem in the context of XML keyword ... More
Radiative Corrections to the Z-b-(anti-b) and Z-tau-(anti-tau) Vertices in a Realistic One-Family Extended Technicolor ModelJun 30 1995In a realistic effective one-family extended technicolor(ETC) model without exact custodial symmetry, we calculate the one-loop corrections to the Z-b-(anti-b) and Z-tau-(anti-tau)vertices from the sideways and diagonal ETC bosons exchange. The result ... More
Nodal-link semimetalsApr 03 2017Jul 08 2017In topological semimetals, the valence band and conduction band meet at zero-dimensional nodal points or one-dimensional nodal rings, which are protected by band topology and symmetries. In this Rapid Communication, we introduce "nodal-link semimetals", ... More
Infrared Topological Plasmons in GrapheneFeb 08 2017We propose a two-dimensional plasmonic platform - periodically patterned monolayer graphene - which hosts topological one-way edge states operable up to infrared frequencies. We classify the band topology of this plasmonic system under time-reversal-symmetry ... More
Electromagnetic Scattering Laws in Weyl SystemsMay 15 2017Wavelength determines the length scale of the cross section when electromagnetic waves are scattered by an electrically small object. The cross section diverges for resonant scattering, and diminishes for non-resonant scattering, when wavelength approaches ... More
Convolutional Invasion and Expansion Networks for Tumor Growth PredictionJan 25 2018Tumor growth is associated with cell invasion and mass-effect, which are traditionally formulated by mathematical models, namely reaction-diffusion equations and biomechanics. Such models can be personalized based on clinical measurements to build the ... More
Three-dimensional topological photonic crystal with a single surface Dirac coneJul 01 2015A single Dirac cone on the surface is the hallmark of three-dimensional (3D) topological insulators, where the double degeneracy at the Dirac point is protected by time-reversal symmetry and the spin-splitting away from the point is provided by the spin-orbital ... More
Performance Analysis of Directional Modulation with Finite-quantized RF Phase Shifters in Analog Beamforming StructureApr 03 2019Apr 09 2019The radio frequency (RF) phase shifter with finite quantization bits in analog beamforming (AB) structure forms quantization error (QE) and causes a performance loss of received signal to interference plus noise ratio (SINR) at the receiver (called Bob). ... More
Quantized electromagnetic response of three-dimensional chiral topological insulatorsAug 22 2014Jan 07 2015Protected by the chiral symmetry, three dimensional chiral topological insulators are characterized by an integer-valued topological invariant. How this invariant could emerge in physical observables is an important question. Here we show that the magneto-electric ... More
Supervised Deep Hashing for Hierarchical Labeled DataApr 07 2017Sep 12 2017Recently, hashing methods have been widely used in large-scale image retrieval. However, most existing hashing methods did not consider the hierarchical relation of labels, which means that they ignored the rich information stored in the hierarchy. Moreover, ... More
Experimental Identification of Non-Abelian Topological Orders on a Quantum SimulatorAug 24 2016Feb 01 2017Topological orders can be used as media for topological quantum computing --- a promising quantum computation model due to its invulnerability against local errors. Conversely, a quantum simulator, often regarded as a quantum computing device for special ... More
Guiding Robust Valley-dependent Edge States by Surface Acoustic WavesOct 08 2018Recently, the concept of valley pseudospin, labeling quantum states of energy extrema in momentum space, has attracted enormous attention because of its potential as a new type of information carrier. Here, we present surface acoustic wave (SAW) waveguides, ... More
Observation of optical vortices in momentum spaceSep 12 2017Vortex, the winding of a vector field in two dimensions, has its core the field singularity and its topological charge defined by the quantized winding angle of the vector field. Vortices are one of the most fundamental topological excitations in nature, ... More
A study of raining influence on the environmental radiation background spectra with HXMT/HENov 25 2016Full functional and performance tests were performed many times before the Hard X-ray Modulation Telescope (HXMT) launch. During one of the tests, the count rate curves of the 18 High Energy Detectors (HED) have been found increased consistently within ... More
Fe-doping induced superconductivity in charge-density-wave system 1T-TaS2Sep 19 2011Sep 12 2012We report the interplay between charge-density-wave (CDW) and superconductivity of 1$T$-Fe$_{x}$Ta$_{1-x}$S$_{2}$ ($0\leq x \leq 0.05$) single crystals. The CDW order is gradually suppressed by Fe-doping, accompanied by the disappearance of pseudogap/Mott-gap ... More
Do Intermediate-Mass Black Holes Exist in Globular Clusters?Aug 13 2013The existence of intermediate-mass black holes (IMBHs) in globular clusters (GCs) remains a crucial problem. Searching IMBHs in GCs reveals a discrepancy between radio observations and dynamical modelings: the upper mass limits constrained by radio observations ... More
Far-Field Tunable Nano-focusing Based on Metallic Slits Surrounded with Nonlinear-Variant Widths and Linear-Variant Depths of Circular Dielectric GratingJan 11 2013In this work, we design a new tunable nanofocusing lens by the linear-variant depths and nonlinear-variant widths of circular grating for far field practical applications. The constructively interference of cylindrical surface plasmon launched by the ... More
Topological magnetoplasmonFeb 01 2016Dec 07 2016Classical wave fields are real-valued, ensuring the wave states at opposite frequencies and momenta to be inherently identical. Such a particle-hole symmetry can open up new possibilities for topological phenomena in classical systems. Here we show that ... More
Doubly and triply coupled nanowire antennasMar 20 2012Nanoantenna is one of the most important optical components for light harvesting. In this study, we show experimental evidence of interactions between coupled nanowires by comparing the fluorescence properties of quantum dots on both non-coupled (single) ... More
Topological Protection of Two-photon Quantum Correlation on a Photonic ChipOct 02 2018Low-decoherence regime plays a key role in constructing multi-particle quantum systems and has therefore been constantly pursued in order to build quantum simulators and quantum computers in a scalable fashion. Quantum error correction and quantum topological ... More
Observing half and integer polarization vortices at band degeneraciesDec 26 2017Far-field polarization vortices were recently found on singlet bands in the momentum-space of two-dimensional photonic lattices, also known as the dark states and bound states in continuum. Here, we theoretically proposed and experimentally verified the ... More
Polar Codes and Polar Lattices for Independent Fading ChannelsJan 19 2016Feb 05 2016In this paper, we design polar codes and polar lattices for i.i.d. fading channels when the channel state information is only available to the receiver. For the binary input case, we propose a new design of polar codes through single-stage polarization ... More
Mean--field stability for the junction of semi-infinite systemsMar 04 2019Junction appears naturally when one studies the surface states or transport properties of quasi 1D materials such as carbon nanotubes, polymers and quantum wires. These materials can be seen as 1D systems embedded in the 3D space. Moreover, topological ... More
Orthogonal symmetric Toeplitz matrices for compressed sensing: Statistical isometry propertyDec 29 2010Oct 24 2012Recently, the statistical restricted isometry property (RIP) has been formulated to analyze the performance of deterministic sampling matrices for compressed sensing. In this paper, we propose the usage of orthogonal symmetric Toeplitz matrices (OSTM) ... More
Topological PhotonicsFeb 12 2018Topological photonics is a rapidly-emerging field of research in which geometrical and topological ideas are exploited to design and control the behavior of light. Drawing inspiration from the discovery of the quantum Hall effects and topological insulators ... More
Enhanced spin injection efficiency in a four-terminal double quantum dot systemDec 02 2009Within the scheme of quantum rate equations, we investigate the spin-resolved transport through a double quantum dot system with four ferromagnetic terminals. It is found that the injection efficiency of spin-polarized electrons can be significantly improved ... More
Spatial proximity effects on the excitation of Sheath RF Voltages by evanescent Slow Waves in the Ion Cyclotron Range of FrequenciesJan 11 2017We investigate theoretically how sheath radio-frequency (RF) oscillations relate to the spatial structure of the near RF parallel electric field E// emitted by Ion Cyclotron (IC) wave launchers. We use a simple model of Slow Wave (SW) evanescence coupled ... More
Deterministic generation and switching of dissipative Kerr soliton in a thermally controlled micro-resonatorOct 11 2018Oct 13 2018Dissipative Kerr solitons (DKSs) in the high-Q micro-resonator corresponds to self-organized short pulse in time domain via double balance between dispersion and Kerr nonlinearity, as well as cavity loss and parametric gain. In this paper, we first experimentally ... More
Experimental Test of Generalized Hardy's ParadoxAug 15 2018Since the pillars of quantum theory were established, it was already noted that quantum physics may allow certain correlations defying any local realistic picture of nature, as first recognized by Einstein, Podolsky and Rosen. These quantum correlations, ... More
Robust pinning of magnetic moments in pyrochlore iridatesMay 02 2017Aug 30 2017Pyrochlore iridates A2Ir2O7 (A = rare earth elements, Y or Bi) hold great promise for realizing novel electronic and magnetic states owing to the interplay of spin-orbit coupling, electron correlation and geometrical frustration. A prominent example is ... More
Topological PhotonicsFeb 12 2018Apr 02 2019Topological photonics is a rapidly emerging field of research in which geometrical and topological ideas are exploited to design and control the behavior of light. Drawing inspiration from the discovery of the quantum Hall effects and topological insulators ... More
Validity of Transport Energy in Disordered Organic SemiconductorsNov 18 2012Nov 20 2012A systematic study of the transport energy in disordered organic semiconductors based on variable range hopping theory has been presented here. The temperature, electric field, material disorder and carrier concentration dependent transport energy is ... More
Topological PhotonicsAug 28 2014Oct 31 2014Topology is revolutionizing photonics, bringing with it new theoretical discoveries and a wealth of potential applications. This field was inspired by the discovery of topological insulators, in which interfacial electrons transport without dissipation ... More
Jitter analysis of a superconducting nanowire single photon detectorAug 04 2013Jitter is one of the key parameters for a superconducting nanowire single photon detector (SNSPD). Using an optimized time-correlated single photon counting system for jitter measurement, we extensively studied the dependence of system jitter on the bias ... More
Angular Reconstruction of a Lead Scintillating-Fiber Sandwiched Electromagnetic CalorimeterAug 26 2013A new method called Neighbor Cell Deposited Energy Ratio (NCDER) is proposed to reconstruct incidence position in a single layer for a 3-dimensional imaging electromagnetic calorimeter (ECAL).This method was applied to reconstruct the ECAL test beam data ... More
Effect of Notch Structure on Magnetic Domain Movement in Planar NanowiresNov 23 2017We present the direct observation of magnetic domain motion in permalloy nanowires with notches using a wide-field Kerr microscopy technique. The domain wall motion can be modulated by the size and shape of the notch structure in the nanowires. It is ... More
Superconductivity at 52 K in iron-based F-doped layered quaternary compound Pr[O1-xFx]FeAsMar 29 2008Since the discovery of copper oxide superconductor in 1986 [1], extensive efforts have been devoted to the search of new high-Tc superconducting materials, especially high-Tc systems other than cuprates. The recently discovered quaternary superconductor ... More
Milne-like Spacetimes and their SymmetriesMar 01 2018May 03 2018When developing a quantum theory for a physical system, one determines the system's symmetry group and its irreducible unitary representations. For Minkowski space, the symmetry group is the Poincar\'e group, $\mathbb{R}^4 \rtimes \text{O}(1,3)$, and ... More
Milne-like spacetimes and their role in CosmologyJun 05 2017May 04 2018Milne-like spacetimes are a class of FLRW models which admit $C^0$ spacetime extensions through the big bang. The boundary of a Milne-like spacetime can be identified with a null cone in the extension. We find that the comoving observers all emanate from ... More
A Function obstruction to the Existence of Complex StructuresJan 05 2019We construct a function for almost-complex Riemannian manifolds. Non-vanishing of the function for the almost-complex structure implies the almost-complex structure is not integrable. Therefore the constructed function is an obstruction for the existence ... More
On Atkin and Swinnerton-Dyer congruence relations (3)Jan 10 2007In the previous two papers with the same title ([LLY05] by W.C. Li, L. Long, Z. Yang and [ALL05] by A.O.L. Atkin, W.C. Li, L. Long), the authors have studied special families of cuspforms for noncongruence arithmetic subgroups. It was found that the Fourier ... More
Multiplicity-Free Representations of Divergence-Free Lie AlgebrasDec 16 2010Divergence-free Lie algebras (also known as the special Lie algebras of Cartan type) are Lie algebras of volume-preserving transformation groups. They are simple in generic case. Dokovic and Zhao found a certain graded generalization of them. In this ... More
Some Asymptotic Behavior of the first Eigenvalue along the Ricci FlowOct 23 2007We study some asymptotic behavior of the first nonzero eigenvalue of the Lalacian along the normalized Ricci flow and give a direct short proof for an asymptotic upper limit estimate.
A Lower Bound of The First Eigenvalue of a Closed Manifold with Positive Ricci CurvatureJun 22 2004Dec 08 2004We give an estimate on the lower bound of the first non-zero eigenvalue of the Laplacian for a closed Riemannian manifold with positive Ricci curvature in terms of the in-diameter and the lower bound of the Ricci curvature.