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相关概念视频

The Hall Effect01:30

The Hall Effect

2.2K
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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Joule-Thomson Effect01:21

Joule-Thomson Effect

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The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
3.2K
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

215
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
215
Superconductor01:24

Superconductor

1.1K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
1.1K

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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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巨大的室温非互惠的霍尔效应.

Lujin Min1,2, Yang Zhang3, Zhijian Xie4

  • 1Department of Physics, Pennsylvania State University, University Park, PA, USA.

Nature materials
|October 21, 2024
PubMed
概括

研究人员在金设备中发现了一种新的横向非互惠的霍尔效应. 这种效应显示出正方形的电流电压关系,可以用于宽带频率混合,在太赫兹技术中的应用.

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 量子材料是一种量子材料.
  • 纳米技术纳米技术

背景情况:

  • 非相互的电荷传输对于量子对称性和应用至关重要.
  • 之前的研究重点是纵向非互惠性,其阻力变化很小.

研究的目的:

  • 报告一个新的横向非互惠运输现象.
  • 研究其特性和潜在的应用.

主要方法:

  • 使用聚焦离子束沉积 (Pt) 在基板上制造微尺度的霍尔设备.
  • 横向非互惠的霍尔效应及其电流电压特性.

主要成果:

  • 观测横向非互惠的霍尔效应,具有二次电流电压特征.
  • 证明源自在纹理的Pt纳米粒子中不对称的散射引起的分离的非互惠性.
  • 效应通过霍尔电流注入向相邻导体 (Au,NbP) 传播.
  • 由于明显的非互惠的霍尔效应,促进宽带频率混合.

结论:

  • 验证非互惠的霍尔效应概念.
  • 在太赫兹通信,成像和能量采集方面的潜在应用.
  • 开辟了探索量子现象和设备功能的新途径.