Volume 136, Number 1, October 2021
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||29 December 2021|
Quasiparticle band structures and optical properties of twisted bilayer MoS2
1 School of Science, Hebei University of Technology - Tianjin 300401, PRC
2 School of Materials Science and Engineering, Hebei University of Technology - Tianjin 300401, PRC
Received: 1 June 2021
Accepted: 2 November 2021
A twist angle between two adjacent layers is a key approach to adjust the electronic characteristics of the van der Waals bilayer. The main goal of this study is to accurately predict the quasiparticle band structures and optical properties of bilayer MoS2 with different twist angles , 13.17°, 21.79°, 32.10°, and 60°) by using many-body perturbation G0W0 theory and by solving the Bethe-Salpeter equation including excitonic effects on top of the partially G0W0 calculation when spin-orbit coupling is included. Results of band structures and optical absorption spectrum show that the band gap and optical gap are sensitive to twist angle. Moreover, the twist angles and spin-orbit coupling can manipulate exciton binding energy. Our results also show that spin-orbit coupling and interlayer coupling (predominantly) induced spin splitting as large as 270 meV at the valence band of K point. This argument implies that twisted bilayer MoS2 is a powerful system for tuning the photoluminescence emission.
© 2021 EPLA
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.