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Critical current density and AC magnetic susceptibility of high-quality FeTe_(0.5)Se_(0.5)superconducting tapes

Superconductivity 2024年第4期12卷 1-8页

作者： Xin Zhou Wenjie Li Qiang Hou Wei Wei Wenhui Liu Ke Wang Xiangzhuo Xing Linfei Liu Jun-Yi Ge Yanpeng Qi Huajun Liu Li Ren Tsuyoshi Tamegai Yue Sun Zhixiang Shi School of Physics Southeast UniversityNanjing 211189China Department of Applied Physics The University of TokyoTokyo 113-8656Japan School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Materials Genome Institute Shanghai UniversityShanghai 200444China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Institute of Plasma Physics Chinese Academy of SciencesHefeiAnhui 230031China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430030China

Iron telluride‐selenium superconducting materials,known for their non‐toxicity,ease of preparation,simple structure,and high upper critical fields,have attracted much research interest in practical *** this work,we conducted electrical transport measurements,magneto‐optical imaging,and AC magnetic susceptibil-ity measurements on FeTe_(0.5)Se_(0.5)superconducting long tapes fabricated via reel‐to‐reel pulsed laser *** transport measurements revealed a high critical current density that remains relatively stable even with increasing external magnetic fields,reaching over 1×10^(5)A/cm^(2)at 8 K and 9 *** calculated pinning force density indicates that normal point pinning is the primary mechanism in these *** magneto‐optical images demonstrated that the tapes show homogeneous superconductivity and uniform distribution of critical current *** AC magnetic susceptibility measurements also confirmed their strong flux pinning nature of withstanding high magnetic *** on these characteristics,FeTe_(0.5)Se_(0.5)superconducting tapes show promising prospects for applications under high magnetic field.

关键词： FeSe_(0.5)Te_(0.5) Coated conductor Flux pinning AC magnetic susceptibility Magneto‐optical imaging

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Light control with Weyl semimetals

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eLight 2023年第1期3卷 268-296页

作者： Cheng Guo Viktar S.Asadchy Bo Zhao Shanhui Fan Department of Applied Physics Stanford UniversityStanfordCA 94305USA Ginzton Laboratory and Department of Electrical Engineering Stanford UniversityStanfordCA 94305USA Department of Electronics and Nanoengineering Aalto University02150 EspooFinland Department of Mechanical Engineering University of HoustonHoustonTX 77204USA

Weyl semimetals are topological materials whose electron quasiparticles obey the Weyl *** possess many unusual properties that may lead to new *** is a tutorial review of the optical properties and applications of Weyl *** review the basic concepts and optical responses of Weyl semimetals,and survey their applications in optics and thermal *** hope this pedagogical text will motivate further research on this emerging topic.

关键词： Weyl semimetal Topological materials Axion electrodynamics Nanophotonics Thermal photonics Optical nonreciprocity

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Construction of small size and high output triboelectric nanogenerator by multi-layer-stacking and charge excitation 3

Construction of small size and high output triboelectric nan...

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2024 3rd International Conference on Smart Grid and Green Energy, ICSGGE 2024

作者： Li, Gui Li, Wen Wang, Jian Xu, Shuyan Fu, Shaoke Shan, Chuncai Wu, Huiyuan An, Shanshan Wang, Ping State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University Chongqing400044 China Department of Applied Physics Chongqing University Chongqing400044 China

The triboelectric nanogenerator (TENG) has been considered a low-frequency mechanical energy collection and conversion device in the modern era. The reasonable stack structure of TENG is an effective method to boost its electric output performance within a limited space. Nevertheless, relying solely on the stacking structure, the TENG is unable to produce excessive output due to the low contact electrification capability of its materials. Hence, there are still significant challenges in enhancing the output performance of stacked TENGs. We propose a multi-layer-stack TENG (M-TENG) with two zigzag-shaped (Z-shaped) multilayer units interleaving and stacking with each other, which enormously enlarges the effective utilization area. Furthermore, a voltage multiplier circuit (VMC) incorporating a Zener diode allows the transfer charge to approach the critical threshold and maintain a stable output. The transfer charge and current of M-TENG integrated with a VMC can reach 1.52 μC and 86 μA, respectively, with the maximum output of the TENG being 8.65 mW (5 Mω). To prove it as a self-power device, M-TENG excited by a VMC is employed to power 912 light-emitting diodes (LEDs) and three temperature and humidity sensors with a power management circuit (PMC), respectively. This work offers a new method for optimizing stacking-layer TENG electric output performance in a narrow space. © Published under licence by IOP Publishing Ltd.

关键词： Zener diodes

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Performance Comparisons of MPEDE-Based Integer and Fractional-Order PID Controllers for a Cruise Control System 1

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4th International Conference on Communication, Devices and Computing (ICCDC 2023)

作者： Mahapatra, Mou Das Mahata, Shibendu De, Ritu Rani Mudi, Rajani Kanta Dey, Chanchal Department of Electrical Engineering Dr. B. C. Roy Engineering College Durgapur India Department of Instrumentation and Electronics Engineering Jadavpur University Kolkata India Department of Applied Physics University of Calcutta Kolkata India

ISBN: (数字)9789819927104

ISBN: (纸本)9789819927098

An effective technique for the optimal design of fractional-order proportional-integral-derivative (FOPID) controller in a cruise control application is presented. The minimization of step response error is formulated as an objective function. Such a proposal avoids evaluating the transient and steady-state response parameters at run-time of the optimizer. The optimization is carried out using a multi-population ensemble differential evolution (MPEDE) method. Comparisons with a classical PID controller also designed using MPEDE demonstrate the faster response time for the FOPID controlled system. The superiority of the proposed fractional controller over those of the recently reported models is demonstrated using various performance metrics. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Controllers

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Design of 1-DOF Integer and Fractional-Order PID Controllers Using an Ensemble Differential Evolution for a Magnetic Levitation System 1

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4th International Conference on Communication, Devices and Computing (ICCDC 2023)

作者： Das Mahapatra, Mou Mahata, Shibendu Rani De, Ritu Kanta Mudi, Rajani Dey, Chanchal Department of Electrical Engineering Dr. B. C. Roy Engineering College Durgapur India Department of Instrumentation and Electronics Engineering Jadavpur University Kolkata India Department of Applied Physics University of Calcutta Kolkata India

ISBN: (数字)9789819927104

ISBN: (纸本)9789819927098

A time-domain-based metaheuristic design approach employing a high-level ensemble of three variants of differential evolution algorithms is presented for an optimal control of magnetic levitation system. Traditional and fractional-order proportional-integral-derivative (FOPID) controllers of one degree-of-freedom, that optimally minimizes the step response error, are designed. Comparisons with the published models highlight the improved transient behavior for both the proposed controllers. Results also demonstrate a significantly smaller settling time for the designed FOPID-based-controlled system compared to the classical one. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Three term control systems

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Advancing Al-doped ZnO thin films structural,optical and electrical properties of low temperature PET substrates via flash lamp annealing

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Journal of Semiconductors 2024年第12期45卷 47-60页

作者： Juwon Lee Chang-Hyeon Jo Gwangseop Lee Min-Sung Bae Slawomir Prucnal Shengqiang Zhou Muhammad Zubair Khan Osama Gohar Mohsin Saleem Jung-Hyuk Koh Graduate School of Intelligent Energy and Industry Chung-Ang UniversityHeukseok-roSeoulRepublic of Korea School of Electrical and Electronic Engineering Chung-Ang UniversitySeoulRepublic of Korea Helmholtz-Zentrum Dresden-Rossendorf Institute of Ion Beam Physics and Materials ResearchBautzner Landstraße 40001328DresdenGermany Department of Materials Science and Engineering Pak-Austria Fachhochschule:Institute of Applied Sciences and TechnologyMangHaripur22621Khyber PakhtunkhwaPakistan Department of Mechanical and Electrical Systems Engineering Graduate School of EngineeringKyoto University of Advanced ScienceGotanda-choYamanouchiUkyo-kuKyoto 615-8577Japan School of Chemical and Materials Engineering(SCME) National University of Sciences&Technology(NUST)H-12Islamabad 44000Pakistan

In this study, aluminum-doped zinc oxide(AZO) thin films were deposited onto a low-temperature polyethylene terephthalate(PET) substrate using DC magnetron sputtering. Deposition parameters included power range of 100-300 W, a working pressure of 15 mTorr, and a substrate temperature of 50 ℃. Post-deposition, flash lamp annealing(FLA) was employed as a rapid thermal processing method with a pulse duration of 1.7 ms and energy density of 7 J·cm-2, aimed at enhancing the film's quality while preserving the temperature-sensitive PET substrate. FLA offers advantages over conventional annealing,including shorter processing times and improved material properties. The structural, optical, and electrical characteristics of the AZO films were assessed using X-ray diffraction, field emission scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy, ultraviolet-visible spectroscopy, and Hall effect measurements. The results demonstrated that properties of AZO films varied with deposition and annealing conditions. Films deposited at 200 W and subjected to FLA exhibited superior crystallinity, with average visible light transmittance exceeding 80% and resistivity as low as 0.38 Ω·cm representing 95%improvement in transmittance. electrical analysis revealed that carrier concentration, mobility, and resistivity were influenced by both sputtering and annealing parameters. These findings underscore the effectiveness of FLA in optimizing AZO thin film properties, highlighting potential in optoelectronics applications.

关键词： flash lamp annealing AZO thin film PET sputtering

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High sensitivity THz detection by Rydberg dark states

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Optics Express 2025年第6期33卷 13121-13132页

作者： Hou, Lei He, Qihui Wang, Junnan Yang, Lei Shi, Wei Li, Hongguang Wang, Yuanbo Zhang, Deng Department of Physics Xi’an University of Technology Xi’an710048 China Shaanxi Key Laboratory of Ultra-Fast Photoelectric Technology and Terahertz Science Xi’An710048 China School of Electrical Engineering Xi’an University of Technology Xi’an710048 China Xi’an Institute of Applied Optics Xi’an710065 China

As terahertz (THz) technology rapidly develops, room temperature THz detectors with high sensitivity and wide bandwidth are urgently required. Rydberg atoms are very sensitive to external electric fields, and offer a promising approach for THz detection with exceptional sensitivity. In this paper, we propose a method for measuring the THz field with the frequency of 0.17 THz using 85Rb Rydberg atoms. By analyzing the probe laser transmission spectrum and atomic population, the electromagnetically induced transparency (EIT) and Autler-Townes (AT) splitting effect are explained by the presence and splitting of the Rydberg dark states;the THz field, coupling laser and probe laser play a crucial role in the EIT signal;and the EIT spectral transmission will increase when the atomic population of the excited state decreases. Moreover, a method was demonstrated to improve the THz detection sensitivity by changing the eigenfrequencies of the Rydberg dark states with THz detuning. This work finds the relationship between EIT-AT effect and atomic population of Rydberg atoms caused by THz wave and provides what we believe to be a new method to improve the detection efficiency. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Atoms

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Demonstration of Magneto-optical Microdisk Resonators Based on Yttrium Iron Garnet

Demonstration of Magneto-optical Microdisk Resonators Based ...

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2024 Conference on Lasers and Electro-Optics/Pacific Rim, CLEO-PR 2024

作者： Yambe, T. Kitai, T. Taniguchi, K. Gao, S. Imamura, R. Kumazaki, H. Fujii, S. Iwamoto, S. Tanabe, T. Ota, Y. Department of Applied Physics and Physico-Informatics Keio University Japan Department of Electronics and Electrical Engineering Keio University Japan Department of Physics Keio University Japan Research Center for Advanced Science and Technology The University of Tokyo Japan

A microdisk resona tor ba sed on monocrysta lline yttrium iron ga rnet is reported. The 100-μm-dia meter microdisk in a 300-nm-thick ga rnet film a llows tight spa tia l confinement to enha nce ma gneto-optica l inte... 详细信息

关键词： Yttrium

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Nonlinear Optical Processes in Strained Graphene with Pseudo-Landau Quantization

Nonlinear Optical Processes in Strained Graphene with Pseudo...

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2024 Conference on Lasers and Electro-Optics/Pacific Rim, CLEO-PR 2024

作者： Nam, Donguk Lu, Kunze Luo, Manlin Gao, Weibo Wang, Qi Jie Sun, Hao School of Electrical and Electronic Engineering Nanyang Technological University Singapore Institute for Functional Intelligent Materials National University of Singapore Singapore Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore

We demonstrate second-order nonlinear optical processes in graphene by harnessing strain-induced sublattice polarization. Pseudo-Landau quantization enabled by strain engineering allows resonant optical transitions, e... 详细信息

关键词： Nonlinear optics

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Stroboscopic x-ray diffraction microscopy of dynamic strain in diamond thin-film bulk acoustic resonators for quantum control of nitrogen-vacancy centers

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Physical Review applied 2024年第2期22卷 024016-024016页

作者： Anthony D’Addario Johnathan Kuan Noah F. Opondo Ozan Erturk Tao Zhou Sunil A. Bhave Martin V. Holt Gregory D. Fuchs Department of Physics Elmore Family School of Electrical and Computer Engineering Center for Nanoscale Materials School of Applied and Engineering Physics Kavli Institute at Cornell for Nanoscale Science Ithaca New York USA

Bulk-mode acoustic waves in a crystalline material exert lattice strain through the thickness of the sample, which couples to the spin Hamiltonian of defect-based qubits such as the nitrogen-vacancy (N-V) center defect in diamond. This mechanism has previously been harnessed for unconventional quantum spin control, spin decoherence protection, and quantum sensing. Bulk-mode acoustic wave devices are also important in the microelectronics industry as microwave filters. A key challenge in both applications is a lack of appropriate operando microscopy tools for quantifying and visualizing gigahertz-frequency dynamic strain. In this work, we directly image acoustic strain within N-V center-coupled diamond thin-film bulk acoustic wave resonators using stroboscopic scanning hard x-ray diffraction microscopy at the Advanced Photon Source. The far-field scattering patterns of the nanofocused x-ray diffraction encode strain information entirely through the illuminated thickness of the resonator. These patterns have a real-space spatial variation that is consistent with the bulk strain’s expected modal distribution and a momentum-space angular variation from which the strain amplitude can be quantitatively deduced. We also perform optical measurements of strain-driven Rabi precession of of the N-V center spin ensemble, providing an additional quantitative measurement of the strain amplitude. As a result, we directly measure one of the six N-V spin-stress coupling parameters, b=2.73(2) MHz/GPa, by correlating these measurements at the same spatial position and applied microwave power. Our results demonstrate a unique technique for directly imaging ac lattice strain in micromechanical structures and provide a direct measurement of a fundamental constant for the N-V center defect spin Hamiltonian.

关键词： Quantum control Spin dynamics Strain Stress Micromechanical devices Nitrogen vacancy centers in diamond Acoustic techniques X-ray diffraction

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