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Giant 2D Skyrmion Topological Hall Effect with Ultrawide Temperature Window and Low-Current Manipulation in 2D Room-Temperature Ferromagnetic Crystals

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Chinese Physics Letters 2023年第11期40卷 131-138页

作者：张高节罗清源文晓琨武浩杨丽靳雯李路吉张佳张文峰舒海波常海欣 State Key Laboratory of Material Processing and Die&Mold technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Wuhan National High Magnetic Field Center and institute for Quantum science and Engineering Huazhong University of Science and TechnologyWuhan 430074China College of Optical and Electronic technology China Jiliang UniversityHangzhou 310018China School of Physics and Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China shenzhen R&D Center of huazhong university of science and technology Shenzhen 518000China

The discovery and manipulation of topological Hall effect(THE),an abnormal magnetoelectric response mostly related to the Dzyaloshinskii–Moriya interaction(DMI),are promising for next-generation spintronic devices based on topological spin textures such as magnetic ***,most skyrmions and THE are stabilized in a narrow temperature window either below or over room temperature with high critical current *** is still elusive and challenging to achieve large THE with both wide temperature window till room temperature and low critical current ***,using controllable,naturally oxidized sub-20 and sub-10 nm 2D van der Waals room-temperature ferromagnetic Fe_(3)GaTe_(2-x)crystals,we report robust 2D skyrmion THE with ultrawide temperature window ranging in three orders of magnitude from 2 to 300 K,in combination with giant THE of~5.4μΩ·cm at 10 K and~0.15μΩ·cm at 300 K,which is 1–3 orders of magnitude larger than that of all known room-temperature 2D skyrmion ***,room-temperature current-controlled THE is also realized with a low critical current density of~6.2×10^(5)A·cm^(-2).First-principles calculations unveil natural oxidation-induced highly enhanced 2D interfacial DMI reasonable for robust giant *** work paves the way to room-temperature electrically controlled 2D THE-based practical spintronic devices.

关键词： topological manipulation magnetic

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Reliability test and failure analysis of high power LED packages

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Journal of Semiconductors 2011年第1期32卷 53-56页

作者：陈照辉张芹王恺罗小兵刘胜 Research institute of Micro/Nano science and technology Shanghai Jiao Tong university Wuhan National Laboratory for Optoelectronics huazhong university of science & technology institute of Microsystems School of Mechanical Science and EngineeringHuazhong University of Science & Technology

A new type application specific light emitting diode （LED） package （ASLP） with freeform polycarbonate lens for street lighting is developed, whose manufacturing processes are compatible with a typical LED packaging process. The reliability test methods and failure criterions from different vendors are reviewed and compared. It is found that test methods and failure criterions are quite different. The rapid reliability assessment standards are urgently needed for the LED industry. 85℃/85 RH with 700 mA is used to test our LED modules with three other vendors for 1000 h, showing no visible degradation in optical performance for our modules, with two other vendors showing significant degradation. Some failure analysis methods such as C-SAM, Nano X-ray CT and optical microscope are used for LED packages. Some failure mechanisms such as delaminations and cracks are detected in the LED packages after the accelerated reliability testing. The finite element simulation method is helpful for the failure analysis and design of the reliability of the LED packaging. One example is used to show one currently used module in industry is vulnerable and may not easily pass the harsh thermal cycle testing.

关键词： LED package ASLP accelerated reliability test failure analysis

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Phase-sensitive Landau-Zener-Stückelberg interference in superconducting quantum circuit

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Chinese Physics B 2021年第2期30卷 79-85页

作者： Zhi-Xuan Yang Yi-Meng Zhang Yu-Xuan Zhou Li-Bo Zhang Fei Yan Song Liu Yuan Xu Jian Li shenzhen institute for Quantum science and Engineering Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Quantum science and Engineering Southern University of Science and TechnologyShenzhen 518055China shenzhen Key Laboratory of Quantum science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Physics Southern University of Science and TechnologyShenzhen 518055China

Superconducting circuit quantum electrodynamics(QED)architecture composed of superconducting qubit and resonator is a powerful platform for exploring quantum physics and quantum information *** employing techniques developed for superconducting quantum computing,we experimentally investigate phase-sensitive Landau-Zener-Stückelberg(LZS)interference phenomena in a circuit *** experiments cover an extensive range of LZS transition parameters and demonstrate the LZS induced Rabi-like oscillation as well as phase-dependent steady-state population.

关键词： superconducting qubit circuit QED Landau-Zener-Stückelberg interference

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Temperature Characteristics of Cathode Sheath in High-Pressure Volume Discharge Derived from Emanating Shock Wave

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Chinese Physics Letters 2012年第12期29卷 137-140页

作者： YANG Chen-Guang XU Yong-Yue ZUO Du-Luo Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074 institute of Optoelectronic science and Engineering Huazhong University of Science and TechnologyWuhan 430074

The temperature characteristics of cathode sheath in high-pressure volume discharge are investigated *** cathode sheath temperatures under various discharge conditions are derived from the speeds of the emanating shock waves which are measured by a Mach-Zehnder *** is found that the cathode sheath temperature and the ratioΔT_(3)/ΔT_(1) of temperature rise between cathode sheath and plasma bulk are determined by the specific energy deposition and the breakdown delay time *** results are helpful for discharge stability improving and shock wave reducing.

关键词： shock interferometry delay

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Evidence for topological superconductivity: Topological edge states in Bi2Te3/FeTe heterostructure

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Chinese Physics B 2020年第9期29卷 45-50页

作者： Bin Guo Kai-Ge Shi Hai-Lang Qin Liang Zhou Wei-Qiang Chen Fei Ye Jia-Wei Mei Hong-Tao He Tian-Luo Pan Gan Wang shenzhen institute for Quantum science and Engineering&Department of Physics Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Quantum science and Engineering Shenzhen Institute for Quantum Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China

Majorana fermions have been predicted to exist at the edge states of a two-dimensional topological *** fabricated single quintuple layer(QL)Bi2Te3/FeTe heterostructure with the step-flow epitaxy method and studied the topological properties of this system by using angle-resolved photoemission spectroscopy and scanning tunneling microscopy/*** observed the coexistence of robust superconductivity and edge states on the single QL Bi2Te3 islands which can be potential evidence for topological superconductor.

关键词： Bi2Te3/FeTe heterostructure topological superconductivity edge states scanning tunnelling microcopy

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Intensity Correlation Time of a Single-Mode Laser Driven by Two Coloured Noises with Coloured Cross-Correlation with Bias Signal Modulation

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Chinese Physics Letters 2005年第10期22卷 2500-2503页

作者：陈黎梅曹力吴大进 Department of Physics Shenzhen University Shenzhen 518060 State Key Laboratory of Laser technology Huazhong University of Science and Technology Wuhan 430074 Department of Physics Huazhong University of Science and Technology Wuhan 430074 CCAST (World Laboratory) PO Box 8730 Beijing 100080

The intensity correlation time T is studied by employing a gain-noise model of a single-mode laser driven by coloured pump noise τ1 and coloured quantum noise τ2 with coloured cross-correlation τ3 with a bias signal modulation. By using the linear approximation method, we detect that a maximum （i.e. resonance） exists in the curves of the intensity correlation time T versus the noise intensities D and Q when the noise correlation coefficient A is positive; and a minimum （i.e. suppression） exists in the T - D and T - Q curves when A is negative. When A is zero, T increases monotonously with increase of D and decreases monotonically with increase of Q. Furthermore, the curve of T versus the pump noise self-correlation time τ1 is also studied. Our study shows that, no matter what the value of A is, there exist one maximum and one minimum in the T - τ1 curve.

关键词： STOCHASTIC RESONANCE MULTIPLICATIVE NOISE SYSTEM MULTIRESONANCE

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Giant enhancement of second-harmonic generation from a nanocavity metasurface

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science China(Physics,Mechanics & Astronomy) 2021年第9期64卷 75-81页

作者： Xuecai Zhang Junhong Deng Mingke Jin Yang Li Ningbin Mao Yutao Tang Xuan Liu Wenfeng Cai Yao Wang Kingfai Li Yanjun Liu Guixin Li Department of Materials science and Engineering Southern University of Science and TechnologyShenzhen 518055China shenzhen institute for Quantum science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China Materials Characterization and Preparation Center Southern University of Science and TechnologyShenzhen 518055China

Nonlinear plasmonic metasurfaces are compatible with complementary metal oxide semiconductor technology and highly promising for on-chip optical switching and modulations and nanoscale frequency ***,the low nonlinearoptical response of metasurface devices limits their practical *** circumvent this constraint,we propose the design of a nanocavity plasmonic metasurface,in which the strong light localization in the nanocavity can be used to boost the efficiency of second-harmonic *** with the single-layer counterpart,experimental results show that the intensity of the second-harmonic waves in the nanocavity metasurface is enhanced by~790 *** proposed nanocavity plasmonic metasurfaces in this work may open new routes for developing highly efficient nonlinear metacrystals for on-chip nonlinear sources,nonlinear image encryption,information processing,and so on.

关键词： metamaterials nonlinear optics nanostructures

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In-situ 3D contour measurement for laser powder bed fusion based on phase guidance

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Theoretical & Applied Mechanics Letters 2023年第2期13卷 113-119页

作者： Yuze Zhang Pan Zhang Xin Jiang Siyuan Zhang Kai Zhong Zhongwei Li State Key Lab of Materials Processing and Die&Mould technology Huazhong University of Science and TechnologyWuhan430074China Research institute of huazhong university of science and technology in shenzhen Shenzhen51800China

In-situ layerwise imaging measurement of laser powder bed fusion(LPBF)provides a wealth of forming and defect data which enables monitoring of components quality and powder bed *** high-resolution camera layerwise imaging and image processing algorithms to monitor fusion area and powder bed geometric defects has been studied by many researchers,which successfully monitored the contours of components and evaluated their ***,research for the methods of in-situ 3D contour measurement or component edge warping identification is *** this study,a 3D contour mea-surement method combining gray intensity and phase difference is proposed,and its accuracy is verified by designed *** results show that the high-precision of the 3D contours can be achieved by the constructed energy minimization *** method can detect the deviations of common ge-ometric features as well as warpage at LPBF component edges,and provides fundamental data for in-situ quality monitoring tools.

关键词： Laser powder bed fusion In-situ measurement Active contours 3D contour Measurement accuracy

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Cooper instability and superconductivity of the Penrose lattice

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science China(Physics,Mechanics & Astronomy) 2022年第8期65卷 110-120页

作者： Yu-Bo Liu Juan-Juan Hao Yongyou Zhang Ye Cao Wei-Qiang Chen Fan Yang School of Physics Beijing Institute of TechnologyBeijing100081China Department of Physics Southern University of Science and TechnologyShenzhen518055China shenzhen institute for Quantum science and Engineering Southern University of Science and TechnologyShenzhen518055China shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and TechnologyShenzhen518055China

Bulk superconductivity(SC) has recently been observed in the Al-Zn-Mg quasicrystal(QC). To settle several fundamental issues of the SC on the QC, we use an attractive Hubbard model to perform a systematic study on the Penrose lattice. The first issue is the Cooper instability of the QC, i.e., no Fermi surface under an infinitesimal attractive interaction. Starting from the two-electron problem outside a filled Fermi sea, we analytically prove that an infinitesimal Hubbard attraction can lead to the Cooper instability as long as the density of the state is nonzero at the Fermi level. The findings provide a basis for the SC on the QC. Our numerical results show that the Cooper pairing always takes place between two time-reversal states, satisfying Anderson’s theorem. On this theorem, we perform a mean-field(MF) study at zero and finite temperatures. The MF study shows that an arbitrarily weak attraction can lead to a pairing order, with the resulting pairing state being well described by the Bardeen-Cooper-Schrieffer theory and the thermal dynamic behaviors being well consistent with the experimental results. The second issue is about the superfluid density on the QC without translational symmetry. Our findings clarify that although the normal state of the system locates at the critical point of the metal-insulator transition, the pairing state exhibits a real SC, carrying finite superfluid density that can be verified by the Meissner effect. This finding is consistent with the experiment results. This study also reveals that the properties of the SC on the Penrose lattice are universal for all QCs.

关键词： superconductivity quasicrystal cooper instability

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Advertisement *** Subsidy:Which is Better for Remanufacturing?

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Journal of Systems science and Systems Engineering 2020年第3期29卷 344-359页

作者： Yanting Huang Benrong Zheng Zongjun Wang College of Management Shenzhen UniversityShenzhen 518060China College of Economics&Management Huazhong Agricultural UniversityWuhan 430070China School of Management Huazhong University of Science and TechnologyWuhan 430074China

The government subsidy plays an important role in the recycling and remanufacturing process of a closed-loop supply *** paper focuses on the impacts of different patterns of government subsidy on the chain members'profits and the ***,we develop three models in a supply chain including a manufacturer,a retailer and a collector,namely(1)the government invests public service advertisement to stimulate the remanufacturing process(Model AS);(2)the government offers only monetary subsidy to the collector(Model MS);(3)the government allocates the subsidy into two parts,namely both advertisement and monetary subsidy(Model HS).We find that,no matter which subsidy pattern the government adopts,both the manufacturer and the collector are beneficiaries of the government subsidy,and that such subsidizing activity is definitely conducive to the environmental *** into account the chain members,profits and the environmental impact,the optimal hybrid subsidy scheme(Model HS)is more beneficial than that in both Model MS and Model AS,which can be attributed to the combination of the incentives provided by the public service advertisement and the price attraction by the monetary *** also find that,for single advertisement and monetary subsidy,the amount of government subsidy will decide their merits and *** direct monetary subsidy in Model MS will have a greater influence regarding to the supply quantity of used products than the mere advertisement subsidy in Model AS when the subsidy is relatively large.

关键词： Supply chain management remanufacturing government subsidy environmental impact

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