共查询到19条相似文献，搜索用时 537 毫秒
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霍尔效应是微电子领域一个重要的物理现象,基于霍尔效应开发的霍尔器件在工业、交通、科学研究中具有广泛的应用价值。在工程应用研究和大学相关专业的实践教学中,采用优良的技术方法和手段非常重要。文章研究开发一种霍尔传感器实验装置,能够按照函数发生器产生的波形生成对应的磁场形态,使磁场形态丰富多种,利于全面观察霍尔传感器;结合示波器可以更形象、直观、全面的观察分析霍尔传感器的输出特性;操作简单、使用方便、观测内容全面;为工科院校中相关专业的实验教学提供了一种有效的实验手段和方法,有利于培养学生开拓性思维和工程应用能力。在工程应用方面也是一种高效的开发实验工具。 相似文献
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霍尔效应是1879年美国物理学家霍尔读研究生期间在做研究载流子导体在磁场中受力作用实验时发现的。本文阐述了霍尔效应的原理及其在霍尔效应研究领域与应用领域的展望。 相似文献
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本文较为详细地阐述了霍尔效电压建立的同时所产生的四种附加电压,从而使实验中测量霍尔效电压带来误差,并介绍了消除误差的方法。 相似文献
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李劲劲 《科技成果管理与研究》2016,(9):53-54
计量基标准的发展趋势是从实物基标准迈向基于物理效应和计量器件的新一代基标准。这是因为基于器件的基标准不受外界条件影响,精度高,重复可靠性好。在电学量子领域,国际计量局规定自1990年1月1日起量子化霍尔电阻基准取代传统的电阻实物基准、约瑟夫森量子电压基准取代韦斯顿电池电压基准成为新一代基准。新一代计量基标准中不可或缺的重要一环就是计量基标准用器件,我国已建立国际先进的量子电压和量子电阻基标准,但基准必不可少的核心器件仍依赖进口。 相似文献
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Jun Ge Yanzhao Liu Jiaheng Li Hao Li Tianchuang Luo Yang Wu Yong Xu Jian Wang 《国家科学评论(英文版)》2020,7(8):1280
The quantum Hall effect (QHE) with quantized Hall resistance of h/νe2 started the research on topological quantum states and laid the foundation of topology in physics. Since then, Haldane proposed the QHE without Landau levels, showing nonzero Chern number |C| = 1, which has been experimentally observed at relatively low temperatures. For emerging physics and low-power-consumption electronics, the key issues are how to increase the working temperature and realize high Chern numbers (C > 1). Here, we report the experimental discovery of high-Chern-number QHE (C = 2) without Landau levels and C = 1 Chern insulator state displaying a nearly quantized Hall resistance plateau above the Néel temperature in MnBi2Te4 devices. Our observations provide a new perspective on topological matter and open new avenues for exploration of exotic topological quantum states and topological phase transitions at higher temperatures. 相似文献
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Jun Ge Da Ma Yanzhao Liu Huichao Wang Yanan Li Jiawei Luo Tianchuang Luo Ying Xing Jiaqiang Yan David Mandrus Haiwen Liu X C Xie Jian Wang 《国家科学评论(英文版)》2020,7(12):1879
Berry phase and Berry curvature play a key role in the development of topology in physics and do contribute to the transport properties in solid state systems. In this paper, we report the finding of novel nonzero Hall effect in topological material ZrTe5 flakes when the in-plane magnetic field is parallel and perpendicular to the current. Surprisingly, both symmetric and antisymmetric components with respect to magnetic field are detected in the in-plane Hall resistivity. Further theoretical analysis suggests that the magnetotransport properties originate from the anomalous velocity induced by Berry curvature in a tilted Weyl semimetal. Our work not only enriches the Hall family but also provides new insights into the Berry phase effect in topological materials. 相似文献
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成都武侯祠是四川旅游景点中非常具有代表性的人文景观,也是四川导游考试中经常涉及的景点。在中职导游教学中,采取文学鉴赏的方式能让学生更全面地了解武侯祠,更生动地讲解武侯祠,并且有利于学生的整体素质提高,也是将文学鉴赏融入导游教学的一个实例。 相似文献
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网上地震纪念馆是国民灾难教育的重要形式.在提出"同上地震纪念馆"的概念基础上指出其建设的可行性和必要性的,并重点分析了网上纪念馆地震馆的内容构建,最后提出了几点建议. 相似文献
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When quasiparticles move in condensed matters, the texture of their internal quantum structure as a function of position and momentum can give rise to Berry phases that have profound effects on the material’s properties. Seminal examples include the anomalous Hall and spin Hall effects from the momentum-space Berry phases in homogeneous crystals. Here, we explore a conjugate form of the electron Berry phase arising from the moiré pattern: the texture of atomic configurations in real space. In homobilayer transition metal dichalcogenides, we show that the real-space Berry phase from moiré patterns manifests as a periodic magnetic field with magnitudes of up to hundreds of Tesla. This quantity distinguishes moiré patterns from different origins, which can have an identical potential landscape, but opposite quantized magnetic flux per supercell. For low-energy carriers, the homobilayer moirés realize topological flux lattices for the quantum-spin Hall effect. An interlayer bias can continuously tune the spatial profile of the moiré magnetic field, whereas the flux per supercell is a topological quantity that can only have a quantized jump observable at a moderate bias. We also reveal the important role of the non-Abelian Berry phase in shaping the energy landscape in small moiré patterns. Our work points to new possibilities to access ultra-high magnetic fields that can be tailored to the nanoscale by electrical and mechanical controls. 相似文献
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Huichao Wang Yanzhao Liu Yongjie Liu Chuanying Xi Junfeng Wang Jun Liu Yong Wang Liang Li Shu Ping Lau Mingliang Tian Jiaqiang Yan David Mandrus Ji-Yan Dai Haiwen Liu Xincheng Xie Jian Wang 《国家科学评论(英文版)》2019,6(5):914
Discrete-scale invariance (DSI) is a phenomenon featuring intriguing log-periodicity that can be rarely observed in quantum systems. Here, we report the log-periodic quantum oscillations in the longitudinal magnetoresistivity (ρxx) and the Hall traces (ρyx) of HfTe5 crystals, which reveal the DSI in the transport-coefficients matrix. The oscillations in ρxx and ρyx show the consistent logB-periodicity with a phase shift. The finding of the logB oscillations in the Hall resistance supports the physical mechanism as a general quantum effect originating from the resonant scattering. Combined with theoretical simulations, we further clarify the origin of the log-periodic oscillations and the DSI in the topological materials. This work evidences the universality of the DSI in the Dirac materials and provides indispensable information for a full understanding of this novel phenomenon. 相似文献
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实验证明，经元极堂三元场处理８ｄ的５０１水萝卜，可提高出苗率，促进幼苗生长，增进植株根，叶发育，提高整株及根菜的产量和净菜率，且能增加根菜的Ｖｃ含量，减少粗纤维量，从而提高菜的品质。 相似文献