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Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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相关实验视频

Updated: Mar 3, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

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在芯片上的激光驱动的自由电子旋转极化器.

Clarisse Woodahl1, Melanie Murillo1, Charles Roques-Carmes1

  • 1Stanford University, E. L. Ginzton Laboratory, Stanford, California 94305, USA.

Physical review letters
|March 1, 2026
PubMed
概括

研究人员开发了一种紧的集成光子芯片,使用激光驱动场产生自旋极化电子. 这种方法可以在纳米尺度上研究高旋转预期值的旋转依赖现象.

科学领域:

  • 物理 物理学 物理
  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术

背景情况:

  • 旋转极化电子对于研究纳米级旋转依赖现象至关重要.
  • 目前用于产生自旋极化电子的方法可能很复杂,缺乏整合.

研究的目的:

  • 提出和描述一种用于在集成光子芯片上产生自旋极化电子的新方法.
  • 为了使纳米规模的研究能够紧和高效地产生自旋极化电子.

主要方法:

  • 在集成光子芯片上利用激光驱动的纳米光子场.
  • 采用一个双阶段的交互过程与自由空间漂移长度.
  • 操纵电子波函数的自旋依赖特性和使用光学近距离场的自旋状态.

主要成果:

  • 提出的方法将自旋依赖特征引入到电子波函数的概率分布中.
  • 第二阶段有效地旋转旋转状态以产生具有高组合平均旋转预期值的电子.
  • 用桌面激光器实现毫米级芯片的潜力已被证明.

结论:

  • 这种集成光子平台为产生自旋极化电子提供了一个紧而高效的解决方案.

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  • 该技术有助于对纳米级自旋依赖电磁效应进行先进的研究.
  • 为微型自旋极化电子源为各种科学应用铺平了道路.