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Sim, Sang Wan
원자제어 저차원 전자계 연구단
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Role of weak interlayer coupling in ultrafast exciton-exciton annihilation in two-dimensional rhenium dichalcogenides

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Title
Role of weak interlayer coupling in ultrafast exciton-exciton annihilation in two-dimensional rhenium dichalcogenides
Author(s)
Sangwan Sim; Lee, Doeon; Lee, Jekwan; Cha, Myungjun; Soonyoung Cha; Heo, Wonhyeok; Cho, Sungjun; Shim, Wooyoung; Lee, Kyusang; Yoo, Jinkyoung; Prasankumar, Rohit P; Choi, Hyunyong; Moon-Ho Jo
Subject
FEW-LAYER RES2, ; CORE-SHELL NANOWIRES, ; ATOMICALLY THIN, ; MONOLAYER, ; TRANSITION, ; RECOMBINATION, ; DYNAMICS, ; SINGLE, ; PHOTOLUMINESCENCE, ; KINETICS
Publication Date
2020-05
Journal
PHYSICAL REVIEW B, v.101, no.17, pp.174309
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 American Physical Society.Strong interactions between excitons are a characteristic feature of two-dimensional (2D) semiconductors, determining important excitonic properties, such as exciton lifetime, coherence, and photon-emission efficiency. Rhenium disulfide (ReS2), a member of the 2D transition-metal dichalcogenide (TMD) family, has recently attracted great attention due to its unique excitons that exhibit excellent polarization selectivity and coherence features. However, an in-depth understanding of exciton-exciton interactions in ReS2 is still lacking. Here we used ultrafast pump-probe spectroscopy to study exciton-exciton interactions in monolayer (1L), bilayer (2L), and triple layer ReS2. We directly measure the rate of exciton-exciton annihilation, a representative Auger-type interaction between excitons. It decreases with increasing layer number, as observed in other 2D TMDs. However, while other TMDs exhibit a sharp weakening of exciton-exciton annihilation between 1L and 2L, such behavior was not observed in ReS2. We attribute this distinct feature in ReS2 to the relatively weak interlayer coupling, which prohibits a substantial change in the electronic structure when the thickness varies. This work not only highlights the unique excitonic properties of ReS2 but also provides novel insight into the thickness dependence of exciton-exciton interactions in 2D systems
URI
https://pr.ibs.re.kr/handle/8788114/7868
DOI
10.1103/PhysRevB.101.174309
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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