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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

11.4K
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...
11.4K
Phase Diagrams02:39

Phase Diagrams

50.7K
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...
50.7K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.6K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.6K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

2.1K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
2.1K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.3K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.3K
Phase Diagram01:19

Phase Diagram

7.1K
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).
7.1K

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関連する実験動画

Updated: Feb 24, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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半定義プログラミングのリラックスによる量子スピンシステムのマッピング・フェーズ・ダイアグラム

David Jansen1, Donato Farina2,3, Luke Mortimer1

  • 1ICFO-Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain.

Physical review letters
|February 22, 2026
PubMed
まとめ
この要約は機械生成です。

この研究は,凝縮物質物理学の量子相変遷を効率的にマッピングするためのリラックス法を導入します. これらの新しい技術は,量子システムの相図を正確に識別し,量子相変遷の研究を進めています.

さらに関連する動画

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

Published on: September 4, 2015

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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関連する実験動画

Last Updated: Feb 24, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
12:37

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

Published on: September 4, 2015

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • 量子力学は,量子力学という
  • 計算物理学の物理

背景:

  • 量子相移行を特定することは,計算的に要求されます.
  • 既存の方法は,大規模な量子システムのスケーラビリティに苦労しています.

研究 の 目的:

  • 量子相変遷を特定するための効率的なリラクゼーション方法を開発,実証する.
  • 1次元と2次元量子システムの相図を生成する.
  • 量子相変遷を研究するためのスケーラブルな枠組みを提供すること.

主な方法:

  • 解決可能な半定義プログラムとして基底状態問題を策定する.
  • 基本状態問題の緩和されたバージョンを使用します.
  • 異なるモデルパラメータのためのモメントのベクトルを分析する.
  • 段階移行を特定するためにコサイン相似性を用いる.
  • 自発的な対称性の破損を捉えるために,観測対象を制限する.

主要な成果:

  • 1D横場 Ising モデルの相変遷を成功裏に再現しました.
  • 2D frustrated bilayer ハイゼンベルクモデル用の相図を生成しました.
  • 2Dモデルの相図に次近近隣の相互作用の影響を図示した.
  • 自発的な対称性の破綻の自然な捕捉を示した.

結論:

  • リラクゼーション・メソッドは,量子相変遷を研究するための新しい効率的な枠組みを提供します.
  • 開発されたアプローチは,システムのサイズに適したスケールで,以前の方法の限界を克服します.
  • この研究は,凝縮物質物理学の研究のための強力な新しいツールを提供します.