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Intense low-noise terahertz generation by relativistic laser irradiating near-critical-density plasma

Chinese Physics B 2023年第3期32卷 363-369页

作者：张世杰周维民银燕邹德滨赵娜谢端卓红斌 Department of Physics National University of Defense TechnologyChangsha 410073China Science and Technology on Plasma Physics Laboratory Laser Fusion Research CenterChina Academy of Engineering Physics(CAEP)Mianyang 621900China Center for Advanced Material Diagnostic Technology Shenzhen Technology UniversityShenzhen 518118China School of Microelectronics and Physics Hunan University of Technology and BusinessChangsha 410205China School of Electronic Information and Electrical Engineering Changsha UniversityChangsha 410003China

Low-noise terahertz(THz)radiation over 100 MV/cm generation by a linearly-polarized relativistic laser pulse interacting with a near-critical-density(NCD)plasma slab is studied by theory and particle-in-cell(PIC)simulations.A theoretical model is established to examine the dipole-like radiation *** THz radiation is attributed to the singlecycle low-frequency surface current,which is longitudinally constrained by the quasi-equilibrium established by the laser ponderomotive force and the ponderomotively induced electrostatic *** theoretical analysis,the spatiotemporal characteristics,polarization property of the THz radiation,and the relation between the radiation strength with the initial parameters of driving laser and plasma are obtained,which are in good consistence with the PIC simulation ***,it is found by PIC simulations that the generation of thermal electrons can be suppressed within the appropriate parameter regime,resulting in a clear THz radiation *** appropriate parameter region is given for generating a low-noise intense THz radiation with peak strength reaching 100 MV/cm,which could find potential applications in nonlinear THz physics.

关键词： intense terahertz radiation relativistic laser–plasma interactions particle-in-cell simulation

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Semivortex solitons and their excited states in spin-orbit-coupled binary bosonic condensates

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Physical Review E 2024年第6期109卷 064201-064201页

作者： Haiming Deng Jinqing Li Zhaopin Chen Yaohui Liu Dong Liu Chunzhi Jiang Chao Kong Boris A. Malomed School of Physics and Electronic-Electrical Engineering Microelectronics and Optoelectronics Technology Key Laboratory of Hunan Higher Education Hunan Engineering Research Center of Advanced Embedded Computing and Intelligent Medical Systems Physics Department and Solid-State Institute Department of Physical Electronics School of Electrical Engineering Faculty of Engineering Instituto de Alta Investigación

It is known that two-dimensional two-component fundamental solitons of the semivortex (SV) type, with vorticities (s+,s−)=(0,1) in their components, are stable ground states (GSs) in the spin-orbit-coupled (SOC) binary Bose-Einstein condensate with the contact self-attraction acting in both components, in spite of the possibility of the critical collapse in the system. However, excited states (ESs) of the SV solitons, with the vorticity set (s+,s−)=(S+,S++1) and S+=1,2,3,..., are unstable in the same system. We construct ESs of SV solitons in the SOC system with opposite signs of the self-interaction in the two components. The main finding is stability of the ES-SV solitons, with the extra vorticity (at least) up to S+=6. The threshold value of the norm for the onset of the critical collapse, Nthr, in these excited states is higher than the commonly known critical value, Nc≈5.85, associated with the single-component Townes solitons, Nthr increasing with the growth of S+. A velocity interval for stable motion of the GS-SV solitons is found too. The results suggest a solution for the challenging problem of the creation of stable vortex solitons with high topological charges.

关键词： Solitons

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Fault Diagnosis Based on Multiscale Multivariate Dispersive Entropy and Bayesian-optimized LSTM Networks for Motor Bearing

Fault Diagnosis Based on Multiscale Multivariate Dispersive ...

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2023 CAA Symposium on Fault Detection, Supervision and Safety for Technical Processes, SAFEPROCESS 2023

作者： Li, Ling Ma, Yucheng Li, Jiaxin Lan, Kaixuan Wang, Menglong Pan, Zhuofu Changsha University of Science and Technology School of Electrical and Information Engineering Changsha410114 China Central South University School of Automation Changsha410083 China Hunan University of Technology and Business Xiangjiang Laboratory and the School of Microelectronics and Physics Changsha410205 China

ISBN: (纸本)9798350337754

Intelligent fault diagnosis of electric motor bearings can be achieved by analyzing their vibration signals. Deep learning methods have been widely used in fault diagnosis because of their ability to fit the behavior of complex systems better. However, the limitations of the single-channel time-series vibration signal and the randomness of the selection of hyperparameters for the deep learning model significantly impact the fault diagnosis results. This paper proposes a novel approach for fault diagnosis of motor bearings based on multiscale multivariate dispersive entropy (MMDE) and Bayesian-optimized long short-term memory (BOLSTM) networks. At first, MMDE is used to extract features from vibration signals of motor bearings, which are then fed into the LSTM networks for classification. Secondly, to optimize the performance of the LSTM networks, a Bayesian optimization algorithm is applied to find the optimal hyperparameters. Finally, the proposed method uses a bearing fault diagnosis dataset to validate the performance. © 2023 IEEE.

关键词： Failure analysis

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Room-Temperature Persistent Luminescence in Metal Halide Perovskite Nanocrystals for Solar-Driven CO_(2)Bioreduction

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CCS Chemistry 2023年第1期5卷 164-175页

作者： Jie Wang Na Chen Wenjie Wang Zhiheng Li Bolong Huang Yanbing Yang Quan Yuan College of Chemistry and Molecular Sciences School of MicroelectronicsWuhan UniversityWuhan 430072 Molecular Science and Biomedicine Laboratory(MBL) Institute of Chemical Biology and NanomedicineState Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082 Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SAR 999077

The rapid crystal growth of metal halide perovskite(MHP)nanocrystals inevitably leads to the generation of abundant crystal defects in the ***,defects-mediated long-lived charges and accompanying room-temperature persistent luminescence are demonstrated to be a general phenomenon in MHP *** functional theory calculations suggest that the collaboration of Schottky and point defects enables upward cascading depletion for electron transfer in MHP nanocrystals,leading to the generation of long-lived photoexcited charges with lifetimes over 30 *** excellent optical properties including the presence of long-lived charges,high charge separation efficiency,and broad absorption in the visible region make MHPs ideal candidates for both photocatalysis and *** MHPs were further integrated with enzymes to construct a light-driven biosynthetic system for the selective production of fine chemicals from CO_(2)with solar *** biosynthetic system can produce formate with a quantum yield of 3.24%,much higher than that of plants(∼0.2-1.6%).These findings will benefit the understanding of the optoelectronic properties of MHPs and further provide opportunities for the development of biosynthetic systems for solar-to-chemical synthesis.

关键词： persistent luminescence nanoparticles metal halide perovskites defects CO_(2)reduction

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Investigation on Dynamic Characteristic Variations Caused by TID for SiC MOSFET Power Devices 5

Investigation on Dynamic Characteristic Variations Caused by...

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5th International Conference on Radiation Effects of Electronic Devices, ICREED 2023

作者： Shu, Lei Liao, Huai-Lin Wu, Zi-Yuan Fang, Xing-Yu Liang, Shi-Wei Li, Tong-De Shen, Shi-Wei Wang, Liang Zhao, Yuan-Fu Peking University School of Integrated Circuit Beijing China Beijing Microelectronics Technology Institute Beijing China China Aerospace Science and Technology Corporation Laboratory of Science and Technology on Radiation Hardened Integrated Circuits Beijing China Hunan University College of Electrical and Information Engineering Changsha Hunan China Chinese Academy of Sciences Institute of Semiconductors Beijing China

ISBN: (纸本)9798350358872

The dynamic characteristics of silicon carbide (SiC) metal-oxide-semiconductor field-effect transistor (MOSFET) power devices is examined after exposure to a total ionizing dose (TID). The dynamic characteristics studied in this paper refer to the capacitive characteristics. The results for ON bias are explored. The irradiated device shows gate-drain capacitive (CGD) characteristic curves shift positively and gate-source capacitive (CGS) characteristic curves shift negatively. The physical mechanisms for these variations are analyzed and confirmed by technology computer-aided design (TCAD) simulation. © 2023 IEEE.

关键词： Silicon carbide

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Recent progress in synthesis of lanthanide-based persistent luminescence nanoparticles

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Journal of Rare Earths 2022年第9期40卷 1333-1342,I0001页

作者： Yurong Wei Chengxu Gong Min Zhao Lei Zhang Shaodan Yang Peixu Li Zhao Ding Quan Yuan Yanbing Yang College of Chemistry and Molecular Sciences School of MicroelectronicsDepartment of Colorectal and Anal SurgeryHubei Key Laboratory of Intestinal and Colorectal DiseasesZhongnan Hospital of Wuhan UniversityWuhan UniversityWuhan 430072China Molecular Science and Biomedicine Laboratory(MBL) State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Luoyang Advanced Manufacturing Industry R&D Center Tianjin Research Institute for Advanced EquipmentTsinghua UniversityLuoyang 471003China

Persistent luminescence nanoparticles(PLNPs)are a kind of phosphors that can remain luminescent for seconds to several days after the stoppage of *** show the special capability to largely broaden the emission range and enhance the luminescence intensity of PLNPs due to their dense energy structure and unique electronic *** the past decades,various methods have been developed for the synthesis of lanthanide-based PLNPs with excellent pe rsistent luminescence propertie s,and the lanthanide-based PLNPs are widely studied in areas including biome dicine,energy,and information *** this review,we summarized the research progress in the synthe sis of lanthanidebased PLNPs and outline d several typical synthesis *** discussed the fundamental concepts of preparation methods as well as the advantages and drawbacks of the typical synthetic approache *** r,the current challenges and the potential solutions for the development of lanthanide-based PLNP s are also discussed in an attempt to provide strate gies to further improve the optical properties of lanthanide-based *** hope this review can contribute to the design of lanthanide-based PLNPs with desired properties and further promote their applications in biomedicine,energy,and information science.

关键词： Lanthanide Persistent luminescence Nanoparticles Defects Bioimaging Rare earths

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Piezovalley effect and magnetovalley coupling in altermagnetic semiconductors

arXiv

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arXiv 2024年

作者： Xie, Weifeng Xu, Xiong Yue, Yunliang Xia, Huayan Wang, Hui School of Microelectronics and Physics Hunan University of Technology and Business Changsha410205 China School of Physics Hunan Key Laboratory of Super Microstructure and Ultrafast Process Hunan Key Laboratory of Nanophotonics and Devices State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China College of Information Engineering Yangzhou University Yangzhou225127 China

Clarifying the physical origin of valley polarization and exploring promising ferrovalley materials are conducive to the application of valley degrees of freedom in the field of information storage. Here, we explore two novel altermagnetic semiconductors (monolayers Nb2Se2O and Nb2SeTeO) with Néel temperature above room temperature based on first-principles calculations. It reveals that uniaxial strain induces valley polarization without spin-orbital coupling (SOC) in altermagnets owing to the piezovalley effect, while uniaxial compressive strain transforms the intrinsic ferrovalley semiconductor into a semimetal, half metal and metal. Moreover, moderate biaxial strain renders Janus monolayer Nb2SeTeO to robust Dirac-like band dispersion. The SOC and intrinsic in-plane magnetocrystalline anisotropy energy induce Dirac-like altermagnets to generate apparent valley polarization through magnetovalley coupling. In terms of SOC perturbation, we elucidate the physical mechanism behind in-plane-magnetization induced valley polarization and demonstrate the magnitude of valley polarization is positively correlated with the square of SOC strength and negatively correlated with the bandgap. The present work reveals the physical origin of valley polarization in altermagnets and expands the application of ferrovalley at room temperature in valleytronics. Copyright © 2024, The Authors. All rights reserved.

关键词： Magnetocrystalline anisotropy

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Electronic structure, Curie temperature, and magnetic transport of a two-dimensional multiferroic MnSe2/In2Se3 heterostructure

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Physical Review Applied 2024年第6期21卷 064012-064012页

作者： Zi-Wen Zhang Yu-Fei Lang Hui-Ping Zhu Bo Li Yu-Qing Zhao Bin Wei Wu-Xing Zhou School of Physics and Electronics Science Hunan University of Science and Technology Hunan Provincial Key Laboratory of Intelligent Sensors and New Sensor Materials Xiangtan 411201 Hunan People’s Republic of China Institute of Microelectronics Key Laboratory of Science and Technology on Silicon Devices Chinese Academy of Sciences Beijing 100029 China SKLSM Institute of SemiconductorsChinese Academy of Sciences Beijing 100083 China School of Materials Science and Engineering Hunan University of Science and Technology Xiangtan 411201 People’s Republic of China

The coupling of ferromagnetic and ferroelectric materials has sparked great interest in the field of spintronics due to nonvolatile electrical magnetic control. In this work, we propose two-dimensional multiferroic MnSe2/In2Se3 van der Waals (vdW) heterostructure to investigate the magnetoelectric coupling. The electronic structure, magnetic anisotropy, magnetic phase transition, and transport properties were investigated by employing the first-principles calculations in combination with the nonequilibrium Green’s function method. The results reveal that polarization reversal not only can effectively tune the Schottky-to-Ohmic contact but also reorients the magnetic easy axis. In addition, Curie temperature (Tc) was predicted based on the Heisenberg model and Monte Carlo simulations, and the competition between interfacial charge injection and lattice mismatch determines the Tc of MnSe2/In2Se3 heterostructure. Furthermore, we constructed the vdW MnSe2/In2Se3-based magnetic-tunnel-junction and ferroelectric-tunnel-junction nanodevice, which exhibits high tunneling magnetoresistance of up to 1.805×103% and a spin-filter efficiency of up to 98.5%. Our findings demonstrate the significant potentials of multiferroic MnSe2/In2Se3 vdW heterostructures in designing a next-generation spintronic and nonvolatile memory device.

关键词： Magnetoelectric effect Spintronics Multiferroic tunnel junctions Semiconductor compounds Transition metal dichalcogenides Van der Waals systems Density functional calculations Nonequilibrium Green's function

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Dynamic control of polarization conversion based on borophene nanostructures in optical communication bands

arXiv

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arXiv 2024年

作者： Wang, Xinyang Lin, Qi Wang, Lingling Liu, Guidong School of Physics and Optoelectronics Xiangtan University Xiangtan411105 China Hunan Engineering Laboratory for Microelectronics Optoelectronics and System on a Chip Xiangtan University Xiangtan411105 China School of Physics and Electronics Hunan University Changsha410082 China

Polarized light has various potential applications in the communication bands, including optical communication, polarization imaging, quantum emission, and quantum communication. However, optimizing polarization control requires continuous improvements in areas such as dynamic tunability, materials, and efficiency. In this work, we propose a borophene-based structure capable of converting linearly polarized light into arbitrarily polarized light through the coherent excitation of localized surface plasmons (LSPs) in optical communication band. Furthermore, a double-layer borophene structure can be achieved by placing a second borophene array at the top of the first one with a 90°relative rotation of their crystalline plane. The rotation direction of the polarization state of the reflected light can be switched by independently controlling the carrier concentration of the two-layer borophene. Finally, a dipole source is used to realize the emission of polarized light, which is two orders of magnitude higher than the emission rate in free space, and the polarization state can be dynamically controlled by manipulating the carrier concentration. Our study is simple and compact, with potential applications in the fields of polarizers, polarization detectors, and quantum emitters. Copyright © 2024, The Authors. All rights reserved.

关键词： Carrier concentration

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Construction of high stability indium gallium zinc oxide transistor biosensors for reliable detection of bladder cancer-associated microRNA

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Chinese Chemical Letters 2022年第2期33卷 979-982页

作者： Jing Guo Ruichen Shen Xuejie Shen Bo Zeng Nianjun Yang Huageng Liang Yanbing Yang Quan Yuan Key Laboratory of Biomedical Polymers of Ministry of Education College of Chemistry and Molecular SciencesSchool of MicroelectronicsWuhan UniversityWuhan 430072China Department of Urology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Institute of Chemical Biology and Nanomedicine State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Institute of Materials Engineering University of SiegenSiegen 57076Germany

Bladder cancer is the most common malignant tumours with high morbidity, mortality and ***, currently developed detection methods for bladder cancer-associated urine biomarkers are hindered by their extremely low abundance. Hence, the exploration of a highly sensitive and selective approach for the detection of trace bladder cancer-associated biomarkers in human urine is of vital importance for the diagnosis of bladder cancer. Herein, we developed a highly reliable indium gallium zinc oxide field effect transistor(IGZO FET) biosensor for the detection of bladder cancer-related biomarker micro RNA. The single-stranded DNA-functionalized IGZO FET biosensors exhibit high sensing reproducibility and stability with an ultralow detection limit of 19.8 amol/L. The device could also be used for quantitative detection of trace micro RNA in human urine samples and can effectively distinguish bladder cancer patients from healthy donors. The development of high performance IGZO FET biosensors presents new opportunities for the achievement of early-stage diagnosis of bladder cancer.

关键词： Bladder cancer Field-effect transistors IGZO miRNA Urine

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