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相关概念视频

The Hall Effect01:30

The Hall Effect

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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Thomson's e/m Experiment01:19

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In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
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The de Broglie Wavelength02:32

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
Consider a cross-section of a thin, infinite conducting plate having a positive charge. For such a large thin plate, as the thickness of the plate tends to zero, the positive charges lie on the plate's two large faces. Without an external electric field, the...
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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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电池大厅效应和量子电池大厅效应

Chaoxi Cui1, Run-Wu Zhang1, Yuhui Qiu1

  • 1Beijing Institute of Technology, Beijing Institute of Technology, Beijing Institute of Technology, Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing 100081, China, Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing 100081, China, and , Zhuhai 519000, China.

Physical review letters
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PubMed
概括
此摘要是机器生成的。

研究人员在2D磁系统中引入了电荷尔效应 (EHE) 和量子电荷尔效应 (QEHE). 这些现象使用电场而不是磁场来产生横流,为潜在的应用提供可调节的控制.

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学 材料科学 材料科学
  • 量子现象是一种量子现象.

背景情况:

  • 通常的霍尔效应和量子霍尔效应在磁场下的2D非磁性系统中被观察到.
  • 这些效应涉及由于对电子电流垂直的应用磁场产生横流.

研究的目的:

  • 提出和研究霍尔效应的电同类,称为电荷尔效应 (EHE) 和量子电荷尔效应 (QEHE).
  • 探索使用电门场的二维磁系统中EHE和QEHE的出现.

主要方法:

  • 对称性分析以确定对内在的EHE和QEHE.HE的要求.
  • 在弱门场下的内在EHE系数的分析表达式.
  • 在特定材料 (单层Ca(FeN) 中研究EHE的第一原则计算2).
  • 在半导体单层 (BaMn2S3) 中通过变化的网关场来证明QEHE.

主要成果:

  • 建议EHE和QEHE发生在由电门场驱动的2D磁系统中.
  • 本质的EHE系数是由贝里曲率偏振和偏振性决定的.
  • 在带交叉附近的单层Ca(FeN) 2中观察到显著的EHE.
  • 在BaMn2S3中通过门场变化证明了QEHE的量化霍尔导电性 (0,±1以e2/h为单位).

结论:

  • 拟议的EHE和QEHE提供电场调整性,与传统的依赖磁场的霍尔效应不同.
  • 这些现象具有很大的应用潜力,因为它们可以通过电门轻松控制.
  • 这些发现为探索凝聚物质系统中的拓学现象提供了新的途径.