Valley phonons and exciton complexes in a monolayer semiconductor

He, Minhao; Rivera, Pasqual; Van Tuan, Dinh; Wilson, Nathan P.; Yang, Min; Taniguchi, Takashi; Watanabe, Kenji; Yan, Jiaqiang; Mandrus, David G.; Yu, Hongyi; Dery, Hanan; Yao, Wang; Xu, Xiaodong

doi:10.1038/s41467-020-14472-0

Title: Valley phonons and exciton complexes in a monolayer semiconductor

Journal Article · Thu Jan 30 00:00:00 EST 2020 · Nature Communications

DOI:https://doi.org/10.1038/s41467-020-14472-0· OSTI ID:1651248

^[1];

^[1]; Van Tuan, Dinh ^[2]; Wilson, Nathan P. ^[1];

^[2]; Taniguchi, Takashi ^[3];

^[3]; Yan, Jiaqiang ^[4]; Mandrus, David G. ^[4];

^[5]; Dery, Hanan ^[2];

^[5];

^[1]

Univ. of Washington, Seattle, WA (United States)
Univ. of Rochester, NY (United States)
National Inst. for Materials Science, Tsukuba (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Hong Kong (China)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES), Materials Sciences & Engineering Division; National Science Foundation (NSF); US Army Research Office (ARO); Research Grants Council of Hong Kong

Grant/Contract Number:: AC05-00OR22725; SC0018171; SC0014349; W911NF-18-1-0431; 1719797; 17312916

OSTI ID:: 1651248

Journal Information:: Nature Communications, Vol. 11, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 90 works

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