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Cha, Soon Young
원자제어 저차원 전자계 연구단
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Light Absorption and Emission Dominated by Trions in the Type-I van der Waals Heterostructures

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Title
Light Absorption and Emission Dominated by Trions in the Type-I van der Waals Heterostructures
Author(s)
Bae, Hyemin; Kim, Suk Hyun; Lee, Seungmin; Noh, Minji; Karni, Ouri; O'beirne, Aidan L.; Barré, Elyse; Sim, Sangwan; Soonyoung Cha; Moon-Ho Jo; Heinz, Tony F.; Choi, Hyunyong
Publication Date
2021-07
Journal
ACS Photonics, v.8, no.7, pp.1972 - 1978
Publisher
American Chemical Society
Abstract
van der Waals (vdW) heterostructures provide a powerful method to control the alignment of energy bands of atomically thin 2D materials. Under light illumination, the optical responses are dominated by Coulomb-bound electron-hole quasiparticles, for example, excitons, trions, and biexcitons, whose contributions accordingly depend on the types of heterostructures. For type-II heterostructures, it has been well established that light excitation results in electrons and holes that are separated in different layers, and the radiative recombination is dominated by the interlayer excitons. On the contrary, little is known about the corresponding optical responses of type-I cases. Understanding the optical characteristics of type-I heterostructures is important to the full exploration of the quasiparticle physics of the 2D heterostacks. In this study, we performed optical spectroscopy on type-I vdW heterostacks composed of monolayer MoTe2 and WSe2. Photoluminescence and reflection contrast spectroscopy show that the light absorption and emission are dominated by the Coulomb-bound trions. Importantly, we observed that the MoTe2 trion emission gets stronger compared with the exciton emission under resonant light excitation to the WSe2 trion absorption state, especially in the WSe2/MoTe2/WSe2 heterotrilayer. A detailed study of photoluminescence excitation further reveals that the charge-transfer mechanism is likely responsible for our observation, which differs from the exciton-dominated dipole-dipole energy transfer in type-II structures. Our demonstration implies that the type-I vdW heterostack provides new opportunities to engineer the light-matter interactions through many-body Coulomb-bound states.
URI
https://pr.ibs.re.kr/handle/8788114/10588
DOI
10.1021/acsphotonics.0c01942
ISSN
2330-4022
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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