Wei Lu

Wei Lu
Renmin University of China | RUC

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1,005
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110,178
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23,344
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Publications

Publications (1,005)
Article
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A novel bacterium, designated Z-25 T, was isolated from a rice paddy rhizosphere soil sample from Wuchang County, China. The Z-25 T strain is gram-negative, rod-shaped, non-spore-forming, aerobic, motile by unipolar flagella and straw white in color. A phylogenetic analysis based on the 16S rRNA gene sequence revealed that strain Z-25 belongs to th...
Article
In this paper, InGaAs/InP avalanche photodetectors with a variety of guard ring structures are investigated. The electric distribution in the device is characterized by experiment and simulation methods to better understand the dark current mechanisms. It is found that deeper guard rings are more effective in preventing edge breakdown for the depre...
Article
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Exploring the photoelectric performance of emerging materials represented by graphene, black phosphorus and transition metal dichalcogenides is attracting enormous research interest for a wide range of electronic and photonic applications. The realization of low-power consuming photodetectors with high sensitivity and fast photoresponse in the tera...
Article
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Multiple Modes Response of Co‐Aperture 2D/1D Phototransistors In article number 2102568, Changlong Liu, Lin Wang, Xuetao Gan, Xiaoshuang Chen, and co‐workers engineer the architecture of 2D/1D co‐aperture phototransistors by using graphene/Bi2Te3 Dirac material and InAs nanowire for operation as in‐situ terahertz detectors at room temperature by se...
Article
Strict requirements for target detection and identification of the complex background have increased because a single detection method is susceptible to environmental factors. The abilities to use terahertz imaging systems with high photoresponsivity and polarization sensitivity are of central importance to practical photodetectors. The present tec...
Article
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Despite the considerable effort, fast and highly sensitive photodetection is not widely available at the low-photon-energy range (~meV) of the electromagnetic spectrum, owing to the challenging light funneling into small active areas with efficient conversion into an electrical signal. Here, we provide an alternative strategy by efficiently integra...
Article
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As an elementary particle, a photon that carries information in frequency, polarization, phase, and amplitude, plays a crucial role in modern science and technology. However, how to retrieve the full information of unknown photons in an ultracompact manner over broad bandwidth remains a challenging task with growing importance. Here, we demonstrate...
Article
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Benefiting from the inherent capacity for detecting longer wavelengths inaccessible to human eyes, infrared photodetectors have found numerous applications in both military and daily life, such as individual combat weapons, automatic driving sensors and night-vision devices. However, the imperfect material growth and incomplete device manufacturing...
Article
A narrow bandpass filter with ultra-wide stopband based on the coupled Tamm plasmon polaritons transmission theory is proposed and fabricated. It only allows the light with a wavelength of 1.55m to pass through and shields light with other wavelengths. This performance is much better than the traditional filters and those reported novel metamateri...
Article
Full-text available
Echinicola , carotenoid-pigmented bacteria, are isolated from various hypersaline environments. Carotenoid accumulation in response to salt stress can stabilize the cell membrane in order to survive. A pink-colored strain SCS 3–6 was isolated from the deep-sea sediment of the South China Sea. Growth was found to occur at 10–45 °C. The strain could...
Article
Prelithiation can replenish active Li into the battery to compensate the Li consumption due to the formation of solid electrolyte interphase (SEI) on the electrode surface, therefore improving the energy density of Li-ion batteries (LIBs), especially for batteries using electrode materials with low initial Coulombic efficiency (ICE). However, pract...
Article
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Terahertz detection has been highly sought to open a range of cutting‐edge applications in biomedical, high‐speed communications, astronomy, security screening, and military surveillance. Nonetheless, these ideal prospects are hindered by the difficulties in photodetection featuring self‐powered operation at room temperature. Here, this challenge i...
Article
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For each generation of semiconductors, the issue of doping techniques is always placed at the top of the priority list since it determines whether a material can be used in the electronic and optoelectronic industry or not. When it comes to 2D materials, significant challenges have been found in controllably doping 2D semiconductors into p‐ or n‐ty...
Article
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Lithium metal is regarded as the ultimate negative electrode material for secondary batteries due to its high energy density. However, it suffers from poor cycling stability because of its high reactivity with liquid electrolytes. Therefore, continuous efforts have been put into improving the cycling Coulombic efficiency (CE) to extend the lifespan...
Article
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HgCdTe avalanche photodiodes promise various fascinating applications due to the outstanding capability of detecting weak signals or even single photon. However, the underlying transport mechanisms of diverse dark current components are still unresolved at high reverse bias, thus limiting the development of high-performance devices. Here, we establ...
Article
Benefit from high quantum efficiency and low dark current, blocked-impurity-band (BIB) detectors have been the state-of-the-art choice in astronomy science. The temperature extrinsic-response-reduction mechanism in BIB detectors is vague for lack of pertinent research. We fabricated Si:P BIB detectors with a remarkable blackbody detectivity of 2 ×...
Article
Full-text available
A bacterial lipase producing bacterium, designated SCS 2–3, was isolated from deep-sea sediment of the South China Sea. Phylogenetic analysis based on the 16S rRNA sequence revealed that strain SCS2-3 belonged to the genus Pseudomonas and had 98.56% similarity to P. xinjiangensis NRRL B-51270T as the closest relative strain. MLSA using four protein...
Article
Ni-rich layered oxide materials have become a major choice of cathode material for electrical vehicle batteries. However, it is an outstanding challenge to improve the safety performance of these batteries as the energy density of the batteries increases with higher Ni content in the cathode material. Here we demonstrate that Ni-rich LiNi0.6Co0.2Mn...
Article
Currently, with the rapid development of mobile Internet, micro-video has become a prevailing format of user-generated contents (UGCs) on various social media platforms. Several studies have been conducted towards to understanding high-level micro-video semantics, such as venue categorization, memorability analysis, and popularity prediction. Howev...
Preprint
A distributed system keeps consistency by disallowing data anomalies. However, especially in the database, the definitions of data anomalies in the current ANSI standard are controversial. The standard does not include all anomalies and does not introduce characters of anomalies. First, the definitions lack a mathematical formalization and cause am...
Article
Infrared multispectral photodetectors with high performance show great potential in a broad range of applications. Here, sensitive and controllable dual-color photodetection at 10.6 and 15.7 μm is demonstrated by using a charge sensitive infrared phototransistor (CSIP) with dynamical optical gate. The CSIP device is fabricated in a GaAs/AlGaAs doub...
Article
Full-text available
Since the invention of transistors, the flow of electrons has become controllable in solid-state electronics. The flow of energy, however, remains elusive, and energy is readily dissipated to lattice via electron-phonon interactions. Hence, minimizing the energy dissipation has long been sought by eliminating phonon-emission process. Here, we repor...
Article
Due to thermal and quantum fluctuations the charge density and the electromagnetic field in metallic structures possess randomly changing components, which control the signal to noise ratio in sensors. With the emergence of nanotechnology individual sensors are made with smaller and smaller structures. We calculated and measured the spatial distrib...
Article
Mn-doped spinel oxides CoAl2O4 marked as CMA-m (m = Co/Mn atom ratio) herein were synthesized and evaluated for the first time as supports of Co-based Fischer-Tropsch synthesis (FTS) catalysts. HAADF-STEM images showed that Mn doping caused more crystal defects on the surface of CMA-m grains, which may provide more attachment sites for cobalt loadi...
Article
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In this paper, a strategy to achieve a simultaneous wavefront shaping and polarization rotation, without compromising the number of pixels and energy efficiency as well as having broadband operation range, is proposed. This strategy is based on the application of a spin-decoupled phase metasurface composed by only one set of metal-insulator-metal (...
Article
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Biofilm and nitrogen fixation are two competitive strategies used by many plant-associated bacteria; however, the mechanisms underlying the formation of nitrogen-fixing biofilms remain largely unknown. Here, we examined the roles of multiple signalling systems in the regulation of biofilm formation by root-associated diazotrophic P. stutzeri A1501....
Article
Metasurface provides a powerful platform to correct the chromatic aberration of conventional lenses in a flexible, integratable, and ultra‐compact manner. Mid‐wavelength infrared has promised many exciting applications ranged from molecular fingerprint detection to low‐light‐level night vision. Developing broadband achromatic metalens in mid‐wavele...
Article
To achieve a better tradeoff between the direction-of-arrival (DOA) estimation resolution and complexity compared to the existing sparse array based estimators, this letter proposes a pseudo noise subspace based DOA estimator for an unfolded coprime linear array (UCLA). On one hand, by unfolding the two subarrays of a general coprime linear array (...
Preprint
Full-text available
A bacterial lipase producer, designated SCS 2–3, was isolated from deep-sea sediment of the South China Sea. Phylogenetic analysis based on the 16S rRNA sequences revealed that strain SCS2-3 belonged to the genus Pseudomonas and had 98.56% similarity with P. xinjiangensis NRRL B-51270 T that the closest relative strain. MLSA using four protein-codi...
Article
The adoption of temporal expressions into SQL:2011 has continuously driven the extensions of temporal support in relational database systems (a.b.a. RDBMSs). In this paper, we present T-SQL, a lightweight yet efficient built-in temporal implementation in RDBMSs. T-SQL completely relies on multi-version concurrency control (MVCC) which is widely ado...
Article
A highly efficient activated carbon supported cobalt based catalyst for Fischer-Tropsch synthesis was constructed. The catalyst was prepared by incipient wetness co-impregnation. The obtained catalyst was activated by multistep activation processes, which was composed of reduction of calcined sample in H2, syngas treatment, carburization in CO, and...
Article
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Unipolar barrier structures are used to suppress dark current in photodetectors by blocking majority carriers. Designing unipolar barriers with conventional materials is challenging due to the strict requirements of lattice and band matching. Two-dimensional materials have self-passivated surfaces and tunable band structures, and can thus be used t...
Article
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The preparation of ternary 2D layered material (2DLM) FePSe3 and field‐effect transistor (FET) type photodetector are investigated. By advancing an optimized chemical vapor transport method, bulk crystal FePSe3 is synthesized within several growth hours instead of routinely required weeks, from which 2DLM FePSe3 flakes with a thickness of ≈22.0 nm...
Article
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Dynamically tunable ultra-narrowband perfect absorbers are important to next-generation active photonic devices. A composite structure of a graphene pair and a microcavity with Bragg mirrors are proposed for this purpose. Based on the electrically controllable doping of graphene and critical coupling of the incident light, the microcavity-graphene...
Article
Inspired by the growing family of Van der Waals materials, hBN supported phonon polaritons have attracted much attention due to their inherent hyperbolic dispersion properties in the mid-infrared. However, the lack of tunability imposes a severe restriction on the diversified, functional and integrated applications. Here, we propose a phase-gradien...
Article
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Blackbody-sensitive room-temperature infrared detection is a notable development direction for future low-dimensional infrared photodetectors. However, because of the limitations of responsivity and spectral response range for low-dimensional narrow bandgap semiconductors, few low-dimensional infrared photodetectors exhibit blackbody sensitivity. H...
Article
Plasmonic cavities can prominently enhance the absorptance of quantum well infrared photodetectors (QWIPs). However, the total thickness of the semiconductor layers is usually in the deep subwavelength scale to ensure an intensified cavity mode, so the devices for the long wavelength infrared range usually contain a single quantum well. Although th...
Article
In this study, we demonstrate the axiotaxy driven growth of belt-shaped InAs nanowires using Au catalysts by molecular beam epitaxy. It is found that, the zinc-blende structured InAs nanowires, with the features of [\(\bar{1}\bar{1}\bar{3}\)] growth direction and extensive {\(1\bar{1}0\)} side-surfaces, are induced by catalysts in Au-In α phase thr...
Article
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The advent of topological semimetals enables the exploitation of symmetry-protected topological phenomena and quantized transport. Here, we present homogeneous rectifiers, converting high-frequency electromagnetic energy into direct current, based on low-energy Dirac fermions of topological semimetal-NiTe2, with state-of-the-art efficiency already...
Article
The avalanche is the foundation of the understanding and vast applications of the breakdown of semiconductors and insulators. Present numerical theories analyzing the avalanche photodetectors are mainly split into two categories: the macroscopic empirical model with fitting parameters and the microscopic process simulation with statistical estimati...
Article
Full-text available
Since 2D materials are typically much more efficient to absorb in-plane polarized light than out-of-plane polarized light, keeping the light polarization in-plane at the 2D material is revealed to be a crucial factor other than critical coupling in light absorption enhancement in a 2D material integrated with a light coupling structure. When the co...
Article
The discovery of Dirac semimetal has stimulated bourgeoning interests for exploring exotic quantum-transport phenomena, holding great promise for manipulating the performance of photoelectric devices that are related to nontrivial band topology. Nevertheless, it still remains elusive on both the device implementation and immediate results, with som...
Article
Surface oxygen groups of carbon materials has been validated to be necessary for the synthesis of supported catalysts. Herein we report that the activity and selectivity of activated carbon-based material supported Co catalysts can be tuned by modifying the surface oxygen group concentration. As the groups were cleansed by H2 at 1173 K, the FTS act...
Article
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Structural colors are colors generated by the interaction between incident light and nanostructures. Structural colors have been studied for decades due to their promising advantages of long-term stability and environmentally-friendly property over conventional pigments and dyes. Previous studies have demonstrated many artificial structural colors...
Article
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Mid-wavelength infrared HgCdTe avalanche photodiodes (APDs) are becoming increasingly significant in research and practical applications for the high linear gain, low excess noise and high quantum efficiency. However, the performance of HgCdTe APDs is largely limited by the voltage dependence of dark current. It has been well known that the tunneli...
Chapter
In the version of this paper that was originally published, reference 3 linked to the wrong website. This has been corrected.
Article
The silicon-based blocked-impurity-band (BIB) detectors play an irreplaceable role in long-wavelength and far-infrared detection applications from 2 to $40~\mu \text{m}$ , especially in astronomy. However, how to remove the anomalous sharp peaks in the spectral response of the planer structures is still unresolved. Here, we propose a tunneling cu...
Article
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In modern electronics and optoelectronics, hot electron behaviors are highly concerned since they determine the performance limit of a device or system, like the associated thermal or power constraint of chips, the Shockley-Queisser limit for solar cell efficiency. Up-to-date, however, the manipulation of hot electrons is mostly based on conceptual...
Preprint
Recent decentralized systems challenge existing serializability isolation level for correctness, e.g., stale read. This challenge can be addressed by imposing linearizable consistency that introduces additional ordering constraints to serializable transactions, namely strict serializability. In this paper, we present a framework that models seriali...
Article
Arbitrary control of the light emission in nanoscale is of great importance to high-performance, compact and integrated on-chip systems. Free-electron impact interactions with metasurfaces provide an excellent platform for the realization of a point source while the generation and engineering of chiral polarized emission is still unresolved. In thi...
Article
Two-dimensional (2D) semiconductors of graphene, as well as transition–metal dichalcogenides, have performed strong interaction with light. Here the strong light–matter interaction between monolayer tungsten disulphide (WS2) excitons and microcavity photons at room temperature is well studied by the introduction of a gain material embedded dielectr...
Article
Full-text available
Running exercise, one of the strategies to protect brain function, has positive effects on neurons and synapses in the cortex and hippocampus. However, white matter, as an important structure of the brain, is often overlooked, and the effects of long-term running exercise on white matter are unknown. Here, 14-month-old male Sprague-Dawley (SD) rats...
Chapter
Extensive technologies have been employed to explore a best way for cross-lingual transfer learning. In medical domain, Named Entity Recognition is pivotal for many downstream tasks, such as medical entity linking and clinical decision support systems. Nevertheless, the lack of annotation limits the applicability in many languages without enough la...
Article
Full-text available
Fluorescence imaging is very useful for skin cancer lesions detection because of its properties of noninvasion and fast imaging. However, conventional fluorescence imaging devices’ excitation light source and camera are usually separated, which will cause problems such as complicated structure, large volume, and poor illumination homogeneity. In th...