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Title: Chiral phonon diode effect in chiral crystals
Authors: Chen, Hao
Wu, Weikang
Zhu, Jiaojiao
Yang, Zhengning
Gong, Weikang
Gao, Weibo
Yang, Shengyuan A.
Zhang, Lifa
Keywords: Science::Physics
Issue Date: 2022
Source: Chen, H., Wu, W., Zhu, J., Yang, Z., Gong, W., Gao, W., Yang, S. A. & Zhang, L. (2022). Chiral phonon diode effect in chiral crystals. Nano Letters, 22(4), 1688-1693.
Project: MOE2019-T2-1-001
Journal: Nano Letters
Abstract: 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 α-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.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.1c04705
Rights: © 2022 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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