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Title: Observation of chiral phonons

Abstract

Chirality reveals symmetry breaking of the fundamental interaction of elementary particles. In condensed matter, for example, the chirality of electrons governs many unconventional transport phenomena such as the quantum Hall effect. Here we show that phonons can exhibit intrinsic chirality in monolayer tungsten diselenide. The broken inversion symmetry of the lattice lifts the degeneracy of clockwise and counterclockwise phonon modes at the corners of the Brillouin zone. We identified the phonons by the intervalley transfer of holes through hole-phonon interactions during the indirect infrared absorption, and we confirmed their chirality by the infrared circular dichroism arising from pseudoangular momentum conservation. The chiral phonons are important for electron-phonon coupling in solids, phonon-driven topological states, and energy-efficient information processing.

Authors:
ORCiD logo; ORCiD logo; ORCiD logo; ; ORCiD logo; ; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1513793
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Science
Additional Journal Information:
Journal Volume: 359; Journal Issue: 6375; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English

Citation Formats

Zhu, Hanyu, Yi, Jun, Li, Ming-Yang, Xiao, Jun, Zhang, Lifa, Yang, Chih-Wen, Kaindl, Robert A., Li, Lain-Jong, Wang, Yuan, and Zhang, Xiang. Observation of chiral phonons. United States: N. p., 2018. Web. doi:10.1126/science.aar2711.
Zhu, Hanyu, Yi, Jun, Li, Ming-Yang, Xiao, Jun, Zhang, Lifa, Yang, Chih-Wen, Kaindl, Robert A., Li, Lain-Jong, Wang, Yuan, & Zhang, Xiang. Observation of chiral phonons. United States. doi:10.1126/science.aar2711.
Zhu, Hanyu, Yi, Jun, Li, Ming-Yang, Xiao, Jun, Zhang, Lifa, Yang, Chih-Wen, Kaindl, Robert A., Li, Lain-Jong, Wang, Yuan, and Zhang, Xiang. Thu . "Observation of chiral phonons". United States. doi:10.1126/science.aar2711. https://www.osti.gov/servlets/purl/1513793.
@article{osti_1513793,
title = {Observation of chiral phonons},
author = {Zhu, Hanyu and Yi, Jun and Li, Ming-Yang and Xiao, Jun and Zhang, Lifa and Yang, Chih-Wen and Kaindl, Robert A. and Li, Lain-Jong and Wang, Yuan and Zhang, Xiang},
abstractNote = {Chirality reveals symmetry breaking of the fundamental interaction of elementary particles. In condensed matter, for example, the chirality of electrons governs many unconventional transport phenomena such as the quantum Hall effect. Here we show that phonons can exhibit intrinsic chirality in monolayer tungsten diselenide. The broken inversion symmetry of the lattice lifts the degeneracy of clockwise and counterclockwise phonon modes at the corners of the Brillouin zone. We identified the phonons by the intervalley transfer of holes through hole-phonon interactions during the indirect infrared absorption, and we confirmed their chirality by the infrared circular dichroism arising from pseudoangular momentum conservation. The chiral phonons are important for electron-phonon coupling in solids, phonon-driven topological states, and energy-efficient information processing.},
doi = {10.1126/science.aar2711},
journal = {Science},
number = 6375,
volume = 359,
place = {United States},
year = {2018},
month = {2}
}

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Cited by: 38 works
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    Works referencing / citing this record:

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