Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session N01: Optical Properties of 2D Materials
11:30 AM–2:30 PM,
Wednesday, March 6, 2024
Room: L100A
Chair: Zhigang Wu, NASA Ames Research Center
Abstract: N01.00004 : Bright and Dark Quadrupolar Excitons in WSe2/MoSe2/WSe2 Heterotrilayer*
12:30 PM–12:42 PM
Presenter:
yongzhi xie
(Peking University)
Author:
yongzhi xie
(Peking University)
present theoretical and experimental investigations on the emission properties of quadrupolar excitons (QXs), a newly redicted type of exciton, in a WSe2/MoSe2/WSe2 heterotrilayer device. Our findings reveal that the optical brightness or darkness of QXs is determined by horizontal mirror symmetry and valley and spin selection rules. Additionally, the emission intensity and energy of both bright and dark QXs can be adjusted by applying an out-of-plane electric field, due to changes in hole distribution and the Stark effect. These results not only provide experimental evidence for the existence of QXs in heterotrilayers but also uncover their novel properties, which have the potential to drive the development of new exciton-based applications.
*This work is supported by the National Key Research and Development Program of China (Grants No.2018YFA0306302, No.2018YFA0305601, and No.2021YFA1400100), and the National Natural Science Foundation of China (NSFC, Grant No. 61875002, No.12274003 , and No.11934001).
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