Entropy in Spin Relaxation, Spintronics, and Magnetic Resonance,Physica Status Solidi (B) - Basic Solid State Physics

当前位置： X-MOL 学术 › Phys. Status Solidi B › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Entropy in Spin Relaxation, Spintronics, and Magnetic Resonance
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2020-07-17 , DOI: 10.1002/pssb.202000301
Gábor Csősz ₁ , Balázs Dóra ₂ , Ferenc Simon _{1,

3}

Affiliation

The entropy change during spin relaxation for a realistic model system is studied, whose spin dynamics can be handled with the Boltzmann equation. The time evolution of the von Neumann entropy is monitored during the process and is compared with the recently introduced concept of the Loschmidt echo envelope. The time evolution of the two quantities is remarkably similar which helps to distinguish reversible and irreversible changes to the ensemble spin state. The method is also demonstrated for a toy model of nuclear magnetic resonance, where the usual π spin echo is performed numerically, and the echo envelope also follows the time evolution of the von Neumann entropy. The numerical approach highlights the utility of the entropy concept in analyzing various processes which occur during spin relaxation.

中文翻译：

自旋弛豫，自旋电子学和磁共振中的熵

研究了一个现实模型系统自旋弛豫过程中的熵变化，其旋转动力学可以通过玻尔兹曼方程进行处理。在此过程中，将监控冯·诺依曼熵的时间演化，并将其与最近引入的Loschmidt回波包络概念进行比较。这两个量的时间演化非常相似，这有助于区分整体自旋状态的可逆和不可逆变化。该方法还针对核磁共振玩具模型进行了演示，其中通常的π自旋回波是通过数字执行的，并且回波包络也遵循冯·诺依曼熵的时间演化。数值方法强调了熵概念在分析自旋弛豫期间发生的各种过程中的实用性。

更新日期：2020-07-17

点击分享查看原文

点击收藏

阅读更多本刊最新论文