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第三十八届中国控制会议

作者： Shan Ma Chuan-Cun Shu Chengdi Xiang School of Automation Central South University State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi University Institute of Super-Microstructure and Ultrafast Process in Advanced Materials School of Physics and Electronics Central South University School of Automation Hangzhou Dianzi University

Linear passive open quantum systems are a simple yet interesting class of open quantum systems. In this paper, we first define the class of linear passive open quantum systems. Then some properties of these systems de... 详细信息

关键词： Passive Quantum System Hopping Interaction Gaussian States Continuous Variable

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New strategy for designing orangish-redemitting phosphor via oxygen-vacancyinduced electronic localization

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Light(Science & Applications) 2019年第1期8卷 1012-1020页

作者： Yi Wei Gongcheng Xing Kang Liu Guogang Li Peipei Dang Sisi Liang Min Liu Ziyong Cheng Dayong Jin Jun Lin Engineering Research Center of Nano-Geomaterials of Ministry of Education Faculty of Materials Science and ChemistryChina University of Geosciences388 Lumo Road430074 WuhanPeople’s Republic of China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of Sciences130022 ChangchunPeople’s Republic of China Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South University410083 ChangshaHunanPeople’s Republic of China State Key Laboratory of Powder Metallurgy Central South University932 South Lushan Road410083 ChangshaHunanPeople’s Republic of China Institute for Biomedical Materials and Devices(IBMD) Faculty of ScienceUniversity of Technology SydneySydneyNSWAustralia School of Applied Physics and Materials Wuyi University529020 JiangmenGuangdongPeople’s Republic of China

Phosphor-converted white-light-emitting diodes(pc-WLED)have been extensively employed as solid-state lighting sources,which have a very important role in people’s daily ***,due to the scarcity of the red component,it is difficult to realize warm white light ***,red-emitting phosphors are urgently required for improving the illumination *** this work,we develop a novel orangish-red La_(4)GeO_(8):Bi^(3+) phosphor,the emission peak of which is located at 600 nm under near-ultraviolet(n-UV)light *** full width at half maximum(fwhm)is 103 nm,the internal quantum efficiency(IQE)exceeds 88%,and the external quantum efficiency(EQE)is 69%.According to Rietveld refinement analysis and density functional theory(DFT)calculations,Bi^(3+) ions randomly occupy all La sites in orthorhombic La_(4)GeO_(8).Importantly,the oxygen-vacancy-induced electronic localization around the Bi3+ions is the main reason for the highly efficient orangish-red *** results provide a new perspective and insight from the local electron structure for designing inorganic phosphor materials that realize the unique luminescence performance of Bi^(3+) ions.

关键词： designing vacancy electronic

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Introduction of Bimetallic Oxide-Modified Carbon Nanotubes for Boosting the Energy Storage Performance of Nico-Ldh Based In-Plane Micro-supercapacitors on Paper

SSRN

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SSRN 2024年

作者： Zhang, Chi Zhu, Zhixiao Zhang, Yanke Shao, Weixuan Wu, Di Peng, Guannan Liu, Zhengchun Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha410083 China College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan University Changsha410082 China

In-plane micro-supercapacitors (IMSCs) have greater promise for use in flexible wearable electronics than traditional stacked configurations due to their ease of integration and conformability. Nickel-cobalt layered double hydroxide (NiCo-LDH) has garnered significant interest as a stellar material for supercapacitors because of its affordable price, regular morphology, and high theoretical capacity. Unfortunately, the intrinsic poor conductivity of LDH materials means that long-term stable cycling and the desirable energy density are never achieved by supercapacitors. To ameliorate this disadvantage, the self-templated approach has been successfully applied in this research to prepare carbon nanotubes (CNTs) with heterogeneous architectures and numerous phase interfaces. This CNT with a typical three-dimensional structure is assembled from carbon nanosheets adorned with WO2 and MoO2 nanoparticles. When combined with LDH in a suitable ratio, the composite electrode's conductivity significantly improves, showing increased capacity and cycling stability. In contrast to commercial CNTs, the larger size of the prepared WO2/MoO2@P, N-CNTs serve a superior supporting and connecting role, thereby preventing the NiCo-LDH from aggregating. Under the best conditions, the composite electrode demonstrates a capacity of 1237 C g-1 at 1 A g-1 and an optimal capacity retention of more than 92%. For the IMSC devices, the composite materials as the positive electrode achieve an energy density of 0.0590 mWh cm-2, and no capacity degradation is observed after 10,000 cycles. In addition, bending tests have demonstrated the mechanical stability of the IMSCs. Therefore, this strategy of mixing highly conductive WO2/MoO2@P, N-CNTs can effectively improve the conductivity of the composite material and the mechanical properties of the overall device. And, this idea can be further extended to the preparation and application of other wearable devices as well. © 2024, The Authors. All rights r

关键词： Carbon nanotubes

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Facet-Controlled LiMn_(2)O_(4)/C as Deionization Electrode with Enhanced Stability and High Desalination Performance

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Nano-Micro Letters 2022年第11期14卷 75-86页

作者： Yuxin Jiang Liyuan Chai Dehe Zhang Fangping Ouyang Xiangyuan Zhou Sikpaam IAlhassan Sailin Liu Yingjie He Lvji Yan Haiying Wang Wenchao Zhang School of Metallurgy and Environment Central South UniversityChangsha 410083People’s Republic of China Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Changsha 410083People’s Republic of China Water Pollution Control Technology Key Lab of Hunan Province Changsha 410083People’s Republic of China School of Physics and Electronics Hunan Key Laboratory for Super-Microstructure and Ultrafast Processand Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083People’s Republic of China State Key Laboratory of Powder Metallurgy and Powder Metallurgy Research InstituteCentral South UniversityChangsha 410083People’s Republic of China School of Chemical Engineering and Advanced Materials Faculty of SciencesEngineering and TechnologyThe University of AdelaideAdelaide 5005Australia

Battery materials as emerging capacitive deionization electrodes for desalination have better salt removal capacities than traditional carbon-based ***_(2)O_(4),a widely used cathode mate-rial,is difficult to utilize as a deionization electrode due to its structural instability upon cycling and Mn dissolution in aqueous-based ***,a facile and low-cost ball-milling routine was proposed to prepare a LiMn_(2)O_(4)material with highly exposed(111)*** prepared electrode exhibited relatively low dissolution of Mn during cycling,which shows its long cycle *** the hybrid capacitive deionization system,the LiMn_(2)O_(4)/C electrode delivered a high desalination capacity of 117.3 mg g^(−1) without obvious capacity decay at a voltage of 1.0 V with a 20 mM initial salt *** addition,the exposed(111)facets significantly alleviated Mn ion dissolution,which also enhanced the structural steadiness.

关键词： Deionization electrode Desalination Lithium-ion battery

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Exploring the regulatory effect of stacked layers on moiréexcitons in twisted WSe_(2)/WSe_(2)/WSe_(2)homotrilayer

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Nano Research 2023年第7期16卷 10573-10579页

作者： Haihong Zheng Biao Wu Chang-Tian Wang Shaofei Li Jun He Zongwen Liu Jian-Tao Wang Ji-an Duan Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South University932 South Lushan RoadChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University932 South Lushan RoadChangsha 410083China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518057China

Moirésuperlattices in van der Waals structures have emerged as a powerful platform for studying the novel quantum properties of two-dimensional *** periodic moirépatterns generated by these structures lead to the formation of flat mini-bands,which alter the electronic energy bands of the *** resulting flat electronic bands can greatly enhance strong correlative interactions between electrons,leading to the emergence of exotic quantum phenomena,including moiréphonons and moiré*** extensive research has been conducted on the exotic quantum phenomena in twisted bilayers of transition metal dichalcogenides(TMDs),and the regulatory effect of stacked layers on moiréexcitons remains *** this study,we report the fabrication of a twisted WSe_(2)/WSe_(2)/WSe_(2) homotrilayer with two twist angles and investigate the influence of stacked layers on moiré*** experiments reveal multiple moiréexciton splitting peaks in the twisted trilayer,with moirépotential depths of 78 and 112 meV in the bilayer and trilayer homostructures,*** also observed the splitting of the moiréexcitons at 90 K,indicating the presence of a deeper moirépotential in the twisted ***,we demonstrate that stacked layers can tune the moiréexcitons by manipulating temperature,laser power,and magnetic *** results provide a new physical model for studying moirésuperlattices and their quantum properties,which could potentially pave the way for the development of quantum optoelectronics.

关键词： materials material field

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Visualizing molecular unidirectional rotation by a rotated weak-field polarization technique

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Physical Review A 2023年第6期108卷 063108-063108页

作者： Zhenzhong Lian Zhou Chen Juan Li Chuan-Cun Shu Zhan Hu Institute of Atomic and Molecular Physics Jilin University Changchun 130012 China Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics Central South University Changsha 410083 China Advanced Light Field and Modern Medical Treatment Science and Technology Innovation Center of Jilin Province Jilin University Changchun 130012 China

The observation of molecular rotational dynamics induced by ultrashort laser pulses is of both fundamental and practical importance. Here, we develop an extended weak-field polarization method that allows us to visualize the two-dimensional spatial rotation of molecules. By manipulating the polarization direction of the pump pulse, this method allows for characterizing the rotational dependence on the azimuth angle when a weak probe pulse is present. To demonstrate this experimental scheme, we examine two types of pump pulses: (1) a linearly polarized pulse and (2) temporally delayed double pulses polarized at an angle of π/4, which are respectively applied to gas-phase molecules N2O at room temperature. The results show that this approach effectively captures the induced impulsive alignment and unidirectional rotation. By solving the time-dependent Liouville equation governing the molecules' behavior under the influence of the polarization-skewed pump pulses, we gain further insights into the mechanisms for generating unidirectional rotation. This work holds promising potential in the detection of two- and three-dimensional rotational dynamics of molecules like enantiomers and superrotors.

关键词： Atomic & molecular processes in external fields Molecules Polarization

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Ion-mediated oxide transistors for neuromorphic electronics: materials, devices, and perspectives

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Applied Physics Reviews 2025年第2期12卷

作者： Li, Ruihan Cheng, Liuqi Liu, Wanrong Jin, Chenxing Shi, Xiaofang Xie, Pengshan Sun, Qijun Long, Mengqiu Yang, Junliang Ho, Johnny C. Sun, Jia Hunan Key Laboratory for Super Microstructure and Ultrafast Process Hunan Key Laboratory of Nanophotonics and Devices School of Physics Central South University 932 South Lushan Road Hunan Changsha 410083 China State Key Laboratory of Precision Manufacturing for Extreme Service Performance College of Mechanical and Electrical Engineering Central South University Hunan Changsha 410083 China State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information Technology 865 Changning Road Shanghai 200050 China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 101400 China Department of Materials Science and Engineering City University of Hong Kong Hong Kong 999077 Hong Kong State Key Laboratory of Terahertz and Millimeter Waves City University of Hong Kong Hong Kong 999077 Hong Kong

Constrained by the physical architecture of von Neumann computing with separated storage and computation, neuromorphic computing architectures have been proposed. Ion-mediated oxide synaptic transistors (IOSTs), with their unique biomimetic characteristics, have become a key fundamental component in the construction of neuromorphic computing systems. This review comprehensively explores the biomimetic principles and critical indicators of IOSTs and discusses the unique advantages and recent developments associated with employing various electrolyte materials as the dielectric layers in IOSTs, including ionic liquids, ionic gels, organic polymer electrolytes, and inorganic solid electrolytes. Furthermore, we explore the extensive applications of IOSTs across multiple domains, such as multisensory bionics and neuromorphic computing. This article provides an exhaustive perspective on the research related to IOSTs and their system integration and applications, offering insights into their evolving landscape in neuromorphic electronics. © 2025 Author(s).

关键词： Physical addresses

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Generation of fractional and multiple imaginary rotational alignment echoes

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Physical Review A 2021年第5期104卷 053105-053105页

作者： Zhenzhong Lian Zhan Hu Hongxia Qi Dehou Fei Sizuo Luo Zhou Chen Chuan-Cun Shu Institute of Atomic and Molecular Physics Advanced Light Field and Modern Medical Treatment Science and Technology Innovation Center of Jilin Province Jilin University Changchun 130012 China Hunan Key Laboratory of Nanophotonics and Devices Hunan Key Laboratory of Super-Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha 410083 China

We present a theoretical investigation to understand the connection between the formation of different rotational alignment echoes and the underlying excitation pathways induced by temporally delayed laser pulses. The fractional and multiple imaginary alignment echoes are predicted and demonstrated in the linear polar molecule carbonyl sulfide. We also use a two-dimensional spectrum obtained from higher-order alignment echo signals to identify the underlying quantum coherence. This work deepens our understanding of the alignment echo phenomenon. It provides a way to gain insight into the relationship between the echo signal and the underlying pathway with potential applications in rotational echo spectroscopy.

关键词： Molecular spectra Strong field excitation Ultrashort pulses Molecules Schroedinger equation

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Evidence for moiréintralayer excitons in twisted WSe_(2)/WSe_(2) homobi layer superlattices

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Light(Science & Applications) 2022年第7期11卷 1493-1500页

作者： Biao Wu Haihong Zheng Shaofei Li Junnan Ding Jun He Yujia Zeng Keqiu Chen Zongwen Liu Shula Chen Anlian Pan Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South University932 South Lushan RoadChangshaHunan 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South University932 South Lushan RoadChangshaHunan 410083China Department of Applied Physics School of Physics and ElectronicsHunan UniversityChangsha 410082China School of Chemical and Biomolecular Engineering The University of SydneySydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneySydneyNSW 2006Australia Hunan Institute of Optoelectronic Integration College of Materials Science and EngineeringHunan UniversityChangshaHunan 410082China Shenzhen Research Institute of Central South University A510aVirtual University BuildingSouthern DistrictHigh-tech Industrial ParkYuehai StreetNanshan DistrictShenzhenChina

Recent advances in twisted van der Waals heterostructure superlattices have emerged as a powerful and attractive platform for exploring novel condensed matter physics due to the interplay between the moirépotential and Coulomb *** moirésuperlattices act as a periodic confinement potential in space to capture interlayer excitons(IXs),resulting in moiréexciton arrays,which provide opportunities for quantum emitters and many-body *** observation of moiréIXs in twisted transition-metal dichalcogenide(TMD)heterostructures has recently been widely ***,the capture and study of the moiréintralayer excitons based on TMD twisted homobilayer(T-HB)remain ***,we report the observation of moiréintralayer excitons in a WSe_(2)/WSe_(2) T-HB with a small twist angle by measuring PL *** multiple split peaks with an energy range of 1.55-1.73 eV are different from that of the monolayer WSe_(2) exciton *** split peaks were caused by the trapping of intralayer excitons via the moiré*** confinement effect of the moirépotential on the moiréintralayer excitons was further demonstrated by the changing of temperature,laser power,and valley *** findings provide a new avenue for exploring new correlated quantum phenomena and their applications.

关键词： twisted layer quantum

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Quantized charge-pumping in higher-order topological insulators

arXiv

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arXiv 2022年

作者： Wu, Bing-Lan Guo, Ai-Min Zhang, Zhi-Qiang Jiang, Hua Gusu Laboratory of Materials Suzhou215123 China Institute for Advanced Study Soochow University Suzhou215006 China Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha410083 China School of Physical Science and Technology Soochow University Suzhou215006 China

We study the quantized charge pumping of higher-order topological insulators (HOTIs) with edge-corner correspondences based on the combination of the rotation of in-plane magnetic field and the quantum spin Hall effect. A picture of a specific charge pumping process is uncovered with the help of the non-equilibrium Green's function method. Significantly, we demonstrate that the quantized charge pumping current is achieved without the participation of bulk states, and the charges move along the boundary of the sample. Furthermore, the effects of external parameters on the pumping current is also studied. We find that the magnitude and direction of the pumping current can be manipulated by adjusting the coupling strength between the leads and sample. Our work deepens the understanding of the charge pumping in HOTIs and extends the study of their transport properties. Copyright © 2022, The Authors. All rights reserved.

关键词： Electric insulators

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