JoVE - Journal of Visualized Experiments
JoVE Visualize
Contact Us
このページは機械翻訳されています。他のページは英語で表示される場合があります。 View in English

トラップされたイオンスピンチェーンにおける連続的な対称性破裂

  • 0Duke Quantum Center, Department of Physics and Electrical and Computer Engineering, Duke University, Durham, NC, USA. leifeng@fudan.edu.cn.
Nature +

|

2023年11月15日

|

2023年11月15日

PubMedで要約を見る

まとめ

この要約は機械生成です。

量子シミュレータを使って 一次元のシステムで 遠距離スピン・オーダーを作成しました この突破により 物質の量子相の研究が 可能になりました

科学分野

  • 量子物理学
  • 凝縮物質物理学
  • 量子シミュレーション

背景

  • 連続的な対称性を持つ一次元システムは,通常,真の長距離秩序のために長距離の相互作用を必要とします.
  • ほとんどの物理系における 短距離の相互作用は これらの量子相の出現を 1次元で制限します

研究 の 目的

  • 一次元システムにおける長距離秩序を持つ量子相を実験的に実現し,研究する.
  • 量子相の安定化における相互作用範囲の役割を調査する.
  • これらのシステムの不均衡のダイナミクスを探求する.

主な方法

  • 量子シミュレータを使って
  • 精密なインタラクションエンジニアリングのために,複数の焦点を合わせたレーザービームを同時に制御します.
  • 準備状態は,最大23回転までのシステムサイズの回転順番を示します.

主要な成果

  • 連続した対称性破裂の特徴である長距離スピン順序を持つ状態を成功裏に準備した.
  • 無秩序な相関を観察した.
  • 異なる相互作用範囲が新興段階に与える影響を研究した.

結論

  • エンジニアリングによるインタラクションによる 1次元システムにおける長距離量子秩序の実現可能性を示した.
  • 低次元における新しい量子相と非均衡のダイナミクスの探索のための新しい道を開いた.

関連する概念動画

Spin–Spin Coupling: One-Bond Coupling 01:17

985

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...

Atomic Nuclei: Nuclear Relaxation Processes 01:23

657

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.

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling) 01:20

1.0K

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

Spin–Spin Coupling Constant: Overview 01:08

937

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling) 01:22

1.1K

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...

Atomic Nuclei: Nuclear Spin State Overview 01:03

967

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...