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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

11.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.9K
The Hall Effect01:30

The Hall Effect

5.5K
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.
5.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

32.2K
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...
32.2K
Colors and Magnetism03:02

Colors and Magnetism

14.9K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.9K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

50.1K
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...
50.1K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

2.0K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
2.0K

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関連する実験動画

Updated: Apr 19, 2026

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Published on: December 5, 2015

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ソリッドステート理論. 固体理論. 量子スピンホール効果は二次元移行金属二カルコゲニドで

Xiaofeng Qian1, Junwei Liu2, Liang Fu3

  • 1Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Science (New York, N.Y.)
|December 16, 2014
PubMed
まとめ

私たちは,2D移行金属二カルコゲン化物の中で,大ギャップ量子スピンホール (QSH) 絶縁体を発見しました. これらの材料は,調節可能な帯域のギャップを提供し,新しいトポロジックトランジスタの可能性を提供し,現在のQSH材料の限界を克服します.

さらに関連する動画

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

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関連する実験動画

Last Updated: Apr 19, 2026

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
08:12

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

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科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マテリアルサイエンス 材料科学
  • 量子化学とは,量子化学である.

背景:

  • 量子スピンホール効果 (QSH) 材料は,トポロジカルに保護されたエッジ状態を持っています.
  • 既存のQSH断熱器の小さな帯域のギャップのために,アプリケーションは限られています.

研究 の 目的:

  • 新しい大ギャップQSH断熱器を予測する.
  • 2D素材で調節可能なバンドのギャップとトポロジカル・フェーズ・トランジションを探求する.
  • トポロジカル・フィールド・エフェクト・トランジスタの新型を提案する.

主な方法:

  • ファースト・プリンシパルの計算.
  • 2次元移行金属二カルコゲン化物 (1T'-MX2) の調査.
  • バンド・インバーションとスピン・オービタ・カップリング効果を分析する.

主要な成果:

  • 1T'-MX2 (W/Mo,Te/Se/S) で大きなギャップのQSH分離器のクラスを予測しました.
  • 特定された固有帯域の逆転と,電場とストレスの経由で調節可能な帯域のギャップ.
  • トポロジカル・フィールド・エフェクト・トランジスタを電場誘発のスイッチングで提案した.

結論:

  • 1T'-MX2素材は,大ギャップQSH断熱器の有望な候補である.
  • 調節可能な帯域のギャップとトポロジカル・フェーズ・トランジションにより,高度な電子機器が可能になります.
  • 提案されているトポロジカル・トランジスタは,キャリア枯渇スイッチングの代替案を提供します.