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関連する概念動画

Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Phase Diagram01:19

Phase Diagram

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The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
6.6K
Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
21.7K
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

14.0K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Valence Bond Theory02:42

Valence Bond Theory

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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...
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DNA Topoisomerases02:02

DNA Topoisomerases

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Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
Topoisomerases are divided into two main types. ...
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マジック・アングル・トウィスト・バイレイヤー・グラフェンの相関駆動型トポロジカル・フェーズ

Youngjoon Choi1,2,3, Hyunjin Kim1,2,3, Yang Peng4

  • 1T. J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA, USA.

Nature
|January 19, 2021
PubMed
まとめ

マジック・アングル・トウィスト・バイレイヤー・グラフェンは 強い電子相互作用によって 6つの新しいトポロジカル・フェーズを明らかにします これらの相はスキャニングトンネル顕微鏡を用いてマッピングされ,磁場における相関誘発の対称性破裂から生じる.

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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関連する実験動画

Last Updated: Nov 21, 2025

Optimized Fabrication Procedure for High-Quality Graphene-based Moir&#233; Superlattice Devices
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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • 量子材料について

背景:

  • マジック・アングル・トウィスト・バイレイヤー・グラフェン (MATBG) は,強い電子対電子相互作用により相関する現象を示す.
  • これらの相互作用はフェルミ表面の再構築と様々な相関相の形成を引き起こします.
  • 多くのMATBG相の局所的な顕微鏡およびトポロジカル特性は未決定のままである.

研究 の 目的:

  • MATBGのトポロジカル・フェーズを有限な磁場下でマッピングする.
  • 現地の顕微鏡の性質とトポロジカルな性質を決定する.
  • MATBG帯構造に対する電子相互作用の影響を調査する.

主な方法:

  • MATBGを検出するためにスキャニングトンネル顕微鏡 (STM) を使用した.
  • 状態の局所密度をフェルミレベルでマッピングした.
  • 静電ドーピングと磁場によって ローカルなランドーファン図を作成した.

主要な成果:

  • 有限磁場における整数埋着から生じる6つの異なるトポロジカル・フェーズを発見した.
  • これらの相は,相関が誘導する対称性を破る移行から発生します.
  • 電子穴非対称性および大きなゼロランダウレベル分裂を含む,電荷中立性ランダウスペクトルの重要な修正が観察されました.

結論:

  • 強い電子相互作用によって MATBG の帯域構造が根本的に変化します
  • これらの相互作用により,新しい,相関主導のトポロジカルフェーズが形成されます.
  • この発見は,2次元材料における相関,トポロジー,磁性の複雑な相互作用に関する洞察を提供します.