Abnormal phonon angular momentum due to off-diagonal elements in the density matrix induced by a temperature gradient

被引：2

作者：

Zhong, Jinxin ^{[1
]}

Sun, Hong ^{[2
]}

Pan, Yang ^{[2
]}

Wang, Zhiguo ^{[1
]}

Xu, Xiangfan ^{[1
]}

Zhang, Lifa ^{[2
]}

Zhou, Jun ^{[2
]}

机构：

[1] Tongji Univ, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China

[2] Nanjing Normal Univ, Inst Phys & Interdisciplinary Sci, Phonon Engn Res Ctr Jiangsu Prov, Ctr Quantum Transport & Thermal Energy Sci,Sch Phy, Nanjing 210023, Peoples R China

来源：

PHYSICAL REVIEW B | 2023年 / 107卷 / 12期

基金：

中国国家自然科学基金;

关键词：

STATISTICAL-MECHANICAL THEORY; THERMAL-CONDUCTIVITY; IRREVERSIBLE PROCESSES; TRANSPORT; STATES;

D O I：

10.1103/PhysRevB.107.125147

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A temperature gradient in chiral materials can generate a nonzero mean value of phonon angular momentum (PAM). We used the Kubo formula to investigate the contribution of both intraband and interband terms of PAM to the mean PAM. Interestingly, the interband term was found to be as important as the intraband term, indicating that the quantum transition between different phonon branches induced by a temperature gradient strongly affects locally atomic rotation. This discovery opens up an alternative mechanism for generating PAM and phonon magnetic moments.

引用

页数：7

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