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Orbital-Ordering Driven Simultaneous Tunability of Magnetism and Electric Polarization in Strained Monolayer VCl_(3)

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Chinese Physics Letters 2024年第4期41卷 126-131页

作者：郭的坪王聪王侣锦陆赟豪吴骅张妍宁季威 Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Zhejiang Province Key Laboratory of Quantum Technology and Device State Key Laboratory of Silicon MaterialsDepartment of PhysicsZhejiang UniversityHangzhou 310027China Laboratory for Computational Physical Sciences(MOE) State Key Laboratory of Surface Physicsand Department of PhysicsFudan UniversityShanghai 200433China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

Two-dimensional(2D)van der Waals magnetic materials have promising and versatile electronic and magnetic properties in the 2D limit,indicating a considerable potential to advance spintronic *** predictions thus far have not ascertained whether monolayer VCl_(3) is a ferromagnetic(FM)or anti-FM monolayer;this also remains to be experimentally *** theoretically investigate the influence of potential factors,including C_(3) symmetry breaking,orbital ordering,epitaxial strain,and charge doping,on the magnetic ground *** first-principles calculations,we predict a collinear type-Ⅲ FM ground state in monolayer VCl_(3) with a broken C_(3) symmetry,wherein only the former two of three t_(2g)orbitals(a_(1g),e_(g2)^(π)and e_(g1)^(π))are *** atomic layer thickness and bond angles of monolayer VCl_(3) undergo abrupt changes driven by an orbital ordering switch,resulting in concomitant structural and magnetic phase *** doping to the underlying Cl atoms of monolayer VCl_(3) without C_(3) symmetry simultaneously induces in-and out-of-plane *** can achieve a multiferroic phase transition if combined with the discovered adjustments of magnetic ground state and polarization magnitude under *** establishment of an orbital-ordering driven regulatory mechanism can facilitate deeper exploration and comprehension of magnetic properties of strongly correlated systems in monolayer VCl_(3).

关键词： monolayer symmetry orbital

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Simulation research of biphasic silicon thin film solar cell of different crystalline volume fraction

Simulation research of biphasic silicon thin film solar cell...

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2010 International Conference on Optics, Photonics and Energy Engineering, OPEE 2010

作者： Yuan, Ning-Yi Wang, Shu-Bo Ding, Jian-Ning Wang, Xiu-Qin Ye, Feng Zhang, Jia-Li Chen, Hong-Min Center of Low-dimension Materials Micro/Nano Device and System Jiangsu Polytechnic University Changzhou 213164 China Key Laboratory of New Energy Source Changzhou 213164 China Center of Micro/Nano Science and Technology College of Mechanical Engineering Jiangsu University Zhenjiang 212013 China

ISBN: (纸本)9781424452354

Optical and electrical parameters of biphasic silicon with different crystalline volume fraction (fc) were estimated via effective medium approximation method and experimental results. Then software AMPS-ID has been performed to investigate the influence of fc on biphasic silicon as the intrinsic layer on the performance of biphasic silicon single-junction and amorphous silicon/biphasic silicon double-junction solar cells. According to the simulation results, biphasic silicon thin film with approximate 50 % fc is suitable to serve as the intrinsic layer of the thin film solar cells, which can achieve the highest conversion efficiency. © 2010 IEEE.

关键词： Thin film solar cells

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Design and Comparison of micro electromagnetic vibration energy harvesters

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key Engineering Materials 2015年 645卷 1223-1232页

作者： Lei, Yiming Wen, Zhiyu Chen, Li Key Laboratory of Fundamental Science on Micro/Nano-Device and System Technology Chongqing University China Microsystem Research Center Chongqing University Chongqing400030 China

This paper presents two electromagnetic vibration energy harvesters based on micro-electro-mechanical (MEMS) technology. Two prototypes with different vibration structures were designed and fabricated. The energy harvester includes a permanent magnet attached on vibration structure (resonator) made by Si and a fixed wire-wound coil, with the total volume of 0.9 cm3. Two energy harvesters with different resonator are tested and compared. Experiments show that: in the same acceleration and a load resistance, the resonant frequency of prototype B is approximately 95% of prototype A;The peak-peak voltage and the maximum power of prototype B is 1.6 times and 2.7 times of prototype A respectively. The test results was analyzed simply and it indicated that the electromagnetic energy harvesting with the spring B has better performance;also proved that the potential ability of the non-linear spring could extend the frequency bandwidth and improve output voltage. © 2015 Trans Tech Publications, Switzerland.

关键词： Electromagnetic induction

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Evaluation of properties of lapped PZT ceramics and silicon cantilever based on eutectic bonding and dicing process

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作者： Li, Yigui Sun, Jian Liu, Jingquan Yang, Chunsheng He, Dannong Tanaka, Katsuhiko Sugiyama, Susumu National Key Laboratory of Micro/Nano Fabrication Technology Research Institute of Micro/Nano Science and Technology Shanghai Jiao Tong University Shanghai 200240 China National Engineering Research Center for Nanotechnology Shanghai 200241 China Department of Micro System Technology Rtsumeikan University 1-1-1 Noji-Higashi Kusatsu Shiga Japan

ISBN: (纸本)0878492119

Piezoelectric sensor can produce voltage when deflected (function as an energy harvester) while piezoelectric actuator can deflect when a voltage is applied. Different device applications have different requirements on the thickness and in-plane geometry of the Lead Zirconate Titanate(PZT) piezoelectric layers and thus have their own processing difficulties. In this paper, PZT-Au-Si cantilever is fabricated by eutectic bonding and dicing *** properties of lapped PZT ceramics and silicon cantilever is also evaluated. The PZT-Au-Si cantilever applications for both piezoelectric actuators and energy harvesters have been confirmed. © (2011) Trans Tech Publications.

关键词： Lead zirconate titanate

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Enrichment efficiency optimization of dielectrophoresis cell chip based on interdigitated microelectrodes array

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key Engineering Materials 2015年 645卷 1255-1260页

作者： Gu, Wenwen Huang, Jie Department of Electronic and Control Engineering College of Engineering and Technology Southwest University Chongqing400715 China National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing University Chongqing400030 China

At present, the majority dielectrophoresis chip designs optimize their performance by electric simulation and fluid field simulation. The lack of further cells force analysis and movement prediction results in a limited cell dielectrophoresis enrichment efficiency. The HepG2 hepatoma carcinoma cell movement under the action of dielectrophoresis force, fluid force and gravity was analyzed respectively by Comsol Multiphysics software. The preliminary optimization conditions for the cell enrichment were obtained. According to the simulation results, the experiments were carried out to investigate the enrichment effect of the HepG2 hepatoma carcinoma cells. The experiment result demonstrated the enrichment efficiency of HepG2 hepatoma carcinoma cells was reached to 88.89% under the 5 V amplitude and 4 MHz frequency sinusoidal signal excitation. © 2015 Trans Tech Publications, Switzerland.

关键词： Efficiency

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A new hybrid piezoelectric-electromagnetic micro vibration energy harvester

A new hybrid piezoelectric-electromagnetic micro vibration e...

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IEEE Conference on Electron devices and Solid-State Circuits

作者： Hua Yu Jielin Zhou Wei Wang College of Optoelectronic Engineering Chongqing China Key Laboratory for Optoelectronic Technology & Systems Ministry of Education of China Chongqing China National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing China

ISBN: (纸本)9781479923366

The paper presents a new hybrid micro piezoelectric-electromagnetic generator for vibration energy harvesting, which generates energy from low frequency and small amplitude vibration environment, using piezoelectric and electromagnetic conversion mechanisms. The paper outlines factors needed when designing the hybrid energy harvester, including the coupling mathematical model, the finite element analysis, optimization procedure and trade-offs. The proposed hybrid energy harvester is also fabricated and experimental results show that the device can generate an open-circuit voltage of 4.32V and produce a power of 13.47μW with an optimal resistive load of 403KΩ at 0.1 m/s 2 acceleration and 105.2 Hz frequency.

关键词： Materials Electromagnetics Arrays Resistance Coils

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Self-assembled MnO2 nanostructures for electrochemical capacitive energy storage

Self-assembled MnO2 nanostructures for electrochemical capac...

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第七届中国储能与动力电池及其关键材料学术研讨与技术交流会

作者： Yuxin Zhang Ming Huang Fei Li Min Kuang Shi Jin Zhu College of Materials Science and Engineering Chongqing University National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology Chongqing University

We would like to introduce the self-assembly of MnO nanostructures with controllable morphology for electrochemical supercapacitor,including mesoporous MnO nanotubes and their arrays,carbon-MnO coaxial nanotubes,CuO/M... 详细信息

关键词： MnO Self-assembled MnO2 nanostructures for electrochemical capacitive energy storage

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Self-assembled MnO2 nanostructures for electrochemical capacitive energy storage

Self-assembled MnO2 nanostructures for electrochemical capac...

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第二届海峡两岸功能材料科技与产业峰会（2015）

We would like to introduce the self-assembly of Mn O2 nanostructures with controllable morphology for electrochemical supercapacitor,including mesoporous Mn O2 nanotubes and their arrays,carbon-Mn O2 coaxial nanotubes,Cu O/Mn O2,Mn O2/diatomite,Ti O2/Mn O2,Co3O4-Sn O2/Mn O2,Mn O2-Ni foam,Mn O2-CNTs-Ni foam and Mn O2-Co3O4-Ni foam nanostructures[1-11].Noteworthily,it is the first time to synthesize

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Stoichiometric effect on electrical and near-infrared photodetection properties of full-composition-range GaAs1−xSbx nanowires

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nano Research 2021年第11期14卷 3961-3968页

作者： Jiamin Sun Mingming Han Meng Peng Lei Zhang Dong Liu Chengcheng Miao Jiafu Ye Zhiyong Pang Longbing He Hailu Wang Qing Li Peng Wang Lin Wang Xiaoshuang Chen Chongxin Shan Litao Sun Weida Hu Zai-xing Yang School of Physics and School of Microelectronics Shandong UniversityJinan250100China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai200083China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China SEU-FEI Nano-Pico Center Key Lab of MEMS of Ministry of EducationCollaborative Innovation Center for Micro/Nano FabricationDevice and SystemSoutheast UniversityNanjing210096China School of Physics and Photoelectric Engineering Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou310024China Henan Key Laboratory of Diamond Optoelectronic Materials and Devices School of Physics and EngineeringZhengzhou UniversityZhengzhou450001China

As one of the most important narrow bandgap ternary semiconductors, GaAs1−xSbx nanowires (NWs) have attracted extensive attention recently, due to the superior hole mobility and the tunable bandgap, which covers the whole near-infrared (NIR) region, for technological applications in next-generation high-performance electronics and NIR photodetection. However, it is still a challenge to the synthesis of high-quality GaAs1−xSbx NWs across the entire range of composition, resulting in the lack of correlation investigation among stoichiometry, microstructure, electronics, and NIR photodetection. Here, we demonstrate the success growth of high-quality GaAs1−xSbx NWs with full composition range by adopting a simple and low-cost surfactant-assisted solid source chemical vapor deposition method. All of the as-prepared NWs are uniform, smooth, and straight, without any phase segregation in all stoichiometric compositions. The lattice constants of each NW composition have been well correlated with the chemical stoichiometry and confirmed by high-resolution transmission electron microscopy, X-ray diffraction, and Raman spectrum. Moreover, with the increase of Sb concentration, the hole mobility of the as-fabricated field-effect-transistors and the responsivity and detectivity of the as-fabricated NIR photodetectors increase accordingly. All the results suggest a careful stoichiometric design is required for achieving optimal NW device performances.

关键词： GaAs1−xSbx nanowire stoichiometry effect full-composition-range field-effect hole mobility near-infrared photodetection

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LONGITUDINAL WAVE RESONANT FREQUENCY CALCULATION AND VERIFICATION OF THE BULK ACOUSTIC RESONATOR

LONGITUDINAL WAVE RESONANT FREQUENCY CALCULATION AND VERIFIC...

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2013 5th IEEE International Conference on Broadband Network & Multimedia technology

作者： Yi HE Yang GAO Bin ZHOU Junru LI School of Information Engineering Southwest University of Science and Technology Institute of Electronic Engineering China Academy of Engineering Physics National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing University

ISBN: (纸本)9781479900961

Thickness and material of electrode, piezoelectric and supporting layer film of the Film Bulk Acoustic Resonator (FBAR) are main influence factors of resonant frequency, desired resonance frequency can be achieved by confirming thickness and material. A formula about thickness, material, frequency parameter and angular frequency has been achieved by deriving stress-equation of motion in longitudinal wave of film bulk acoustic resonator;frequency parameter has been get from Newton iteration of determinant of stress and displacement boundary conditions, continuity equations simulated by MATLAB. The resonant frequency of a certain FBAR whose thickness, material and frequency parameter are determined has been calculated by the formula, and the calculation value is 1.441 GHz. Equivalent circuit of longitudinal vibration Mason model which has the same thickness, material with formula calculation has been simulated by ADS, and resonant frequency of simulation model is 1.473GHz. Verification simulation of equivalent circuit of longitudinal vibration Mason model shows: resonant frequency calculation value by formula and the simulation value of model are very close, and we can use the formula to calculate longitudinal wave resonance frequency of FBAR.

关键词： FBAR resonant frequency Newton iteration Mason model ADS simulation

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