Observation of chiral phonons

Handle URI:
http://hdl.handle.net/10754/627265
Title:
Observation of chiral phonons
Authors:
Zhu, Hanyu ( 0000-0003-3376-5352 ) ; Yi, Jun ( 0000-0003-2186-6615 ) ; Li, Ming-yang ( 0000-0001-8392-9752 ) ; Xiao, Jun; Zhang, Lifa ( 0000-0001-6108-1404 ) ; Yang, Chih-Wen; Kaindl, Robert A. ( 0000-0003-3639-5625 ) ; Li, Lain-Jong ( 0000-0002-4059-7783 ) ; Wang, Yuan ( 0000-0001-7892-2812 ) ; Zhang, Xiang ( 0000-0002-3272-894X )
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.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program
Citation:
Zhu H, Yi J, Li M-Y, Xiao J, Zhang L, et al. (2018) Observation of chiral phonons. Science 359: 579–582. Available: http://dx.doi.org/10.1126/science.aar2711.
Publisher:
American Association for the Advancement of Science (AAAS)
Journal:
Science
Issue Date:
1-Feb-2018
DOI:
10.1126/science.aar2711
Type:
Article
ISSN:
0036-8075; 1095-9203
Sponsors:
We thank F. Wang and Q. Niu for helpful discussions. This work was primarily supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract no. DE-AC02-05-CH11231 within the van der Waals Heterostructures program (KCWF16) for sample preparation and theory and data analysis, and within the Subwavelength Metamaterials Program (KC12XZ) for optical design and measurement. R.A.K. was supported under the same contract within the Ultrafast Materials Science program (KC2203) for mid-IR frequency conversion. J.Y. acknowledges a scholarship from the China Scholarship Council (CSC) under grant no. 201606310094. L.Z. thanks M. Gao for helpful calculation and discussion and acknowledges support from the National Natural Science Foundation of China (grant no. 11574154). L.-J.L. acknowledges support from the King Abdullah University of Science and Technology through a Competitive Research Grant (CRG5) for monolayer WSe<INF>2</INF> synthesis. All data needed to evaluate the conclusions in the paper are present in the paper and the supplementary materials.
Additional Links:
http://science.sciencemag.org/content/359/6375/579.full
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorZhu, Hanyuen
dc.contributor.authorYi, Junen
dc.contributor.authorLi, Ming-yangen
dc.contributor.authorXiao, Junen
dc.contributor.authorZhang, Lifaen
dc.contributor.authorYang, Chih-Wenen
dc.contributor.authorKaindl, Robert A.en
dc.contributor.authorLi, Lain-Jongen
dc.contributor.authorWang, Yuanen
dc.contributor.authorZhang, Xiangen
dc.date.accessioned2018-03-11T06:54:13Z-
dc.date.available2018-03-11T06:54:13Z-
dc.date.issued2018-02-01en
dc.identifier.citationZhu H, Yi J, Li M-Y, Xiao J, Zhang L, et al. (2018) Observation of chiral phonons. Science 359: 579–582. Available: http://dx.doi.org/10.1126/science.aar2711.en
dc.identifier.issn0036-8075en
dc.identifier.issn1095-9203en
dc.identifier.doi10.1126/science.aar2711en
dc.identifier.urihttp://hdl.handle.net/10754/627265-
dc.description.abstractChirality 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.en
dc.description.sponsorshipWe thank F. Wang and Q. Niu for helpful discussions. This work was primarily supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract no. DE-AC02-05-CH11231 within the van der Waals Heterostructures program (KCWF16) for sample preparation and theory and data analysis, and within the Subwavelength Metamaterials Program (KC12XZ) for optical design and measurement. R.A.K. was supported under the same contract within the Ultrafast Materials Science program (KC2203) for mid-IR frequency conversion. J.Y. acknowledges a scholarship from the China Scholarship Council (CSC) under grant no. 201606310094. L.Z. thanks M. Gao for helpful calculation and discussion and acknowledges support from the National Natural Science Foundation of China (grant no. 11574154). L.-J.L. acknowledges support from the King Abdullah University of Science and Technology through a Competitive Research Grant (CRG5) for monolayer WSe<INF>2</INF> synthesis. All data needed to evaluate the conclusions in the paper are present in the paper and the supplementary materials.en
dc.publisherAmerican Association for the Advancement of Science (AAAS)en
dc.relation.urlhttp://science.sciencemag.org/content/359/6375/579.fullen
dc.titleObservation of chiral phononsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.identifier.journalScienceen
dc.contributor.institutionMaterials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, , United Statesen
dc.contributor.institutionNanoscale Science and Engineering Center, University of California, Berkeley, CA, 94720, , United Statesen
dc.contributor.institutionDepartment of Physics, Nanjing Normal University, Nanjing, Jiangsu, 210023, , Chinaen
kaust.authorLi, Ming-yangen
kaust.authorYang, Chih-Wenen
kaust.authorLi, Lain-Jongen
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