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相关概念视频

Displacement Current01:19

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Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
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Electrical current is defined as the rate at which charge flows. When there is a large current present, such as that used to run a refrigerator, a large amount of charge moves through the wire in a small amount of time. If the current is small, such as that used to operate a handheld calculator, a small amount of charge moves through the circuit over a long period of time. The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836).
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In the realm of electrical engineering, physicist Gustav Robert Kirchhoff made a significant contribution in 1847 by introducing Kirchhoff's laws for electric circuit analysis. These laws, particularly Kirchhoff's Current Law (KCL), have become foundational principles in understanding and analyzing electrical circuits.
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A displacement current is analogous to a real current in Ampère's law, participating in Ampère's law the same way as the usual conduction current. However, it is produced by a changing electric field. Displacement current is defined in terms of a time-varying electric field, and also has an associated displacement current density. By adding a term accounting for displacement current, Maxwell modified the existing Ampère's law, which is now called generalized Ampère's law.
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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
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光线与山谷电流的直接合.

S Sharma1,2, D Gill3, J Krishna3

  • 1Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2A, 12489, Berlin, Germany. geet1729@gmail.com.

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概括

循环极化光现在可以在二维材料中控制谷流. 超快的光脉冲产生动量空间谷二极体,使新的valleytronic设备能够直接操纵谷电荷和电流.

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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
  • 量子电子学 量子电子学

背景情况:

  • 二维 (2D) 半导体提供基于谷自由度的独特电子特性.
  • 目前使用循环偏光的方法主要与谷电荷结合,而不是谷电流,限制了valleytronic设备的控制.
  • 谷电流的光波操纵对于先进的valleytronic应用至关重要.

研究的目的:

  • 在二维材料中演示谷电流的直接光波控制.
  • 探索使山谷电流操纵成为可能的潜在物理机制.
  • 为了研究超快的valleytronic设备的潜力.

主要方法:

  • 使用过渡金属二甲基化物和偏向双层石墨烯最小紧密结合模型进行理论建模.
  • 使用时间依赖密度函数理论 (TD-DFT) 的模拟与短暂的激发效应.
  • 对几周期循环极化光脉冲的新兴向量特征的分析.

主要成果:

  • 几周期循环偏光直接与谷流相联,这与之前的理解相矛盾.
  • 一个新兴的动量空间谷双极被确定为关键的物理机制.
  • 完全控制山谷电流的方向和大小是通过山谷二极管实现的.
  • 谷谷电流是在femtosecond时间尺度 (1-14 fs) 上生成的,有可能克服量子脱凝.

结论:

  • 超快速的光-物质相互作用可以在二维材料中解锁新的自由度.
  • 对山谷电流的直接操纵为新型山谷电子设备开辟了道路.
  • 超高速模式中的新兴现象为量子电子提供了令人兴奋的可能性.