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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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Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Electric Field of Parallel Conducting Plates01:16

Electric Field of Parallel Conducting Plates

1.0K
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...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
43.2K
Metallic Solids02:37

Metallic Solids

18.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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相关实验视频

Updated: Jul 29, 2025

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

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在多铁体二维材料中的层室效应.

Yangyang Feng1, Ying Dai1, Baibiao Huang1

  • 1School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Shandanan Street 27, Jinan 250100, China.

Nano letters
|May 26, 2023
PubMed
概括
此摘要是机器生成的。

在多铁二维材料中提出了层霍尔效应 (LHE) 的新机制. 这种由贝里曲率和对称性破坏驱动的效应是可控制和可逆的,为LHE研究开辟了新的途径.

关键词:
铁电机电机电机电机电机电机这是第一原则.层层 霍尔效应 霍尔效应多种铁族的多铁族.两个维的材料是二维材料.

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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学是一种材料科学.
  • 多重铁路 (Multiferroics) 是一种铁路.

背景情况:

  • 层霍尔效应 (LHE) 是至关重要的,但很少被观察到,通常需要持久的电场或滑动的铁电.
  • 现有的LHE范式在适用性和观察方面是有限的.
  • 了解LHE的新机制对于推进二维材料研究至关重要.

研究的目的:

  • 提出一种用于观察多铁二维材料中的层霍尔效应 (LHE) 的新机制.
  • 探索对称性,时间逆转对称性破坏和谷地物理在产生LHE中的作用.
  • 为了证明预测LHE的铁电控制和可逆性.

主要方法:

  • 利用对称性分析和低能效模型提出新的LHE机制.
  • 研究了时间逆转对称破裂和谷地物理学对布洛赫电子的影响.
  • 采用第一原则计算来验证二层Co2CF2.2中的机制.

主要成果:

  • 通过将层物理与多铁素结合起来,为LHE提出了一个新的机制.
  • 一个山谷中的大贝利曲率,加上反向对称性破坏,导致层极化贝利曲率.
  • 所产生的LHE被证明是可铁电控制和可逆的.
  • 第一个原则的计算证实了Co2CF2双层中的机制和现象.

结论:

  • 该研究提出了一种新的机制,用于在多铁二维材料中产生层霍尔效应.
  • 展示了LHE的铁电控制和可逆性,并提供了实际意义.
  • 这项研究为LHE和2D材料研究开辟了新的方向,特别是在多铁材料领域.