Valley phonons and exciton complexes in a monolayer semiconductor

Minhao He, Pasqual Rivera, Dinh Tuan, Nathan P. Wilson, Min Yang, Takashi Taniguchi, Kenji Watanabe, Jiaqiang Yan, David G. Mandrus, Hongyi Yu, Hanan Dery (), Wang Yao () and Xiaodong Xu ()
Additional contact information
Minhao He: University of Washington
Pasqual Rivera: University of Washington
Dinh Tuan: University of Rochester
Nathan P. Wilson: University of Washington
Min Yang: University of Rochester
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
Jiaqiang Yan: Oak Ridge National Laboratory
David G. Mandrus: Oak Ridge National Laboratory
Hongyi Yu: University of Hong Kong
Hanan Dery: University of Rochester
Wang Yao: University of Hong Kong
Xiaodong Xu: University of Washington

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract The coupling between spin, charge, and lattice degrees of freedom plays an important role in a wide range of fundamental phenomena. Monolayer semiconducting transitional metal dichalcogenides have emerged as an outstanding platform for studying these coupling effects. Here, we report the observation of multiple valley phonons – phonons with momentum vectors pointing to the corners of the hexagonal Brillouin zone – and the resulting exciton complexes in the monolayer semiconductor WSe2. We find that these valley phonons lead to efficient intervalley scattering of quasi particles in both exciton formation and relaxation. This leads to a series of photoluminescence peaks as valley phonon replicas of dark trions. Using identified valley phonons, we also uncover an intervalley exciton near charge neutrality. Our work not only identifies a number of previously unknown 2D excitonic species, but also shows that monolayer WSe2 is a prime candidate for studying interactions between spin, pseudospin, and zone-edge phonons.

Date: 2020
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DOI: 10.1038/s41467-020-14472-0

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