Quantum interference between dark-excitons and zone-edged acoustic phonons in few-layer WS2

Qing-Hai Tan, Yun-Mei Li, Jia-Min Lai, Yu-Jia Sun, Zhe Zhang, Feilong Song, Cedric Robert, Xavier Marie, Weibo Gao, Ping-Heng Tan () and Jun Zhang ()
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Qing-Hai Tan: Chinese Academy of Sciences
Yun-Mei Li: Xiamen University
Jia-Min Lai: Chinese Academy of Sciences
Yu-Jia Sun: Chinese Academy of Sciences
Zhe Zhang: Chinese Academy of Sciences
Feilong Song: Chinese Academy of Sciences
Cedric Robert: University of Toulouse, INSA-CNRS-UPS, LPCNO
Xavier Marie: University of Toulouse, INSA-CNRS-UPS, LPCNO
Weibo Gao: Nanyang Technological University
Ping-Heng Tan: Chinese Academy of Sciences
Jun Zhang: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Fano resonance which describes a quantum interference between continuum and discrete states, provides a unique method for studying strongly interacting physics. Here, we report a Fano resonance between dark excitons and zone-edged acoustic phonons in few-layer WS2 by using the resonant Raman technique. The discrete phonons with large momentum at the M-point of the Brillouin zone and the continuum dark exciton states related to the optically forbidden transition at K and Q valleys are coupled by the exciton-phonon interactions. We observe rich Fano resonance behaviors across layers and modes defined by an asymmetry-parameter q: including constructive interference with two mirrored asymmetry Fano peaks (weak coupling, q > 1 and q

Date: 2023
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DOI: 10.1038/s41467-022-35714-3

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