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Observation of chiral phonons

Zhu, Hanyu ; Yi, Jun ; Li, Ming-Yang ; Xiao, Jun ; Zhang, Lifa ; Yang, Chih-Wen ; Kaindl, Robert A ; Li, Lain-Jong ; Wang, Yuan ; Zhang, Xiang

Science (American Association for the Advancement of Science), 2018-02, Vol.359 (6375), p.579-582 [Periódico revisado por pares]

United States: The American Association for the Advancement of Science

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Título:
Observation of chiral phonons
Autor: Zhu, Hanyu ; Yi, Jun ; Li, Ming-Yang ; Xiao, Jun ; Zhang, Lifa ; Yang, Chih-Wen ; Kaindl, Robert A ; Li, Lain-Jong ; Wang, Yuan ; Zhang, Xiang
Assuntos: Asymmetry ; Brillouin zones ; Broken symmetry ; Chemical reactions ; Chemical speciation ; Chirality ; Circular dichroism ; Condensed matter physics ; Coupling ; Data processing ; Dichroism ; Elementary particles ; Energy efficiency ; Hall effect ; Handedness ; Information processing ; Infrared absorption ; Lattice vibration ; Lifts ; Monolayers ; Phonons ; Quantum Hall effect ; Selenides ; Solids ; Symmetry ; Transport phenomena ; Tungsten ; Tungsten compounds
É parte de: Science (American Association for the Advancement of Science), 2018-02, Vol.359 (6375), p.579-582
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
USDOE
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
AC02-05-CH11231, program KCWF16; AC02-05-CH11231, program KC2203; AC02-05CH11231
Descrição: 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.
Editor: United States: The American Association for the Advancement of Science
Idioma: Inglês

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Observation of chiral phonons

Zhu, Hanyu ; Yi, Jun ; Li, Ming-Yang ; Xiao, Jun ; Zhang, Lifa ; Yang, Chih-Wen ; Kaindl, Robert A ; Li, Lain-Jong ; Wang, Yuan ; Zhang, Xiang

United States: The American Association for the Advancement of Science

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