Chiral Phonon Diode Effect in Chiral Crystals

被引：43

作者：

Chen, Hao ^{[1
,2
,3
]}

Wu, Weikang ^{[3
,4
]}

Zhu, Jiaojiao ^{[4
]}

Yang, Zhengning ^{[3
]}

Gong, Weikang ^{[5
,6
]}

Gao, Weibo ^{[3
]}

Yang, Shengyuan A. ^{[4
]}

Zhang, Lifa ^{[1
,2
]}

机构：

[1] Nanjing Normal Univ, NNU SULI Thermal Energy Res Ctr, Sch Phys & Technol, Nanjing 210023, Peoples R China

[2] Nanjing Normal Univ, Ctr Quantum Transport & Thermal Energy Sci CQTES, Sch Phys & Technol, Nanjing 210023, Peoples R China

[3] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore

[4] Singapore Univ Technol & Design, Res Lab Quantum Mat, Singapore 487372, Singapore

[5] Beijing Univ Technol, Coll Life Sci & Chem, Fac Environm & Life Sci, Beijing 100124, Peoples R China

[6] Nanyang Technol Univ, Sch Phys & Math Sci, Div Math Sci, Singapore 637371, Singapore

来源：

NANO LETTERS | 2022年 / 22卷 / 04期

关键词：

chiral crystals; chiral phonon diode effect; chirality filtering; chirality-orbit coupling; pseudoangular momentum; first-principles calculations; QUARTZ;

D O I：

10.1021/acs.nanolett.1c04705

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The diode effect means that carriers can only flow in one direction but not the other. While diode effects for electron charge, spin, or photon have been widely discussed, it remains a question whether a chiral phonon diode can be realized, which utilizes the chiral degree of freedom of lattice vibrations. In this work, we reveal an intrinsic connection between the chiralities of a crystal structure and its phonon excitations, which naturally leads to the chiral phonon diode effect in chiral crystals. At a certain frequency, phonons with a definite chirality can propagate only in one direction but not the opposite. We demonstrate the idea in concrete materials including bulk Te and alpha-quartz (SiO2). Our work discovers the fundamental physics of chirality coupling between different levels of a system, and the predicted effect will provide a new route to control phonon transport and design information devices.

引用

页码：1688 / 1693

页数：6

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