Role of weak interlayer coupling in ultrafast exciton-exciton annihilation in two-dimensional rhenium dichalcogenides

Sim, Sangwan; Lee, Doeon; Lee, Jekwan; Cha, Myungjun; Cha, Soonyoung; Heo, Wonhyeok; Cho, Sungjun; Shim, Wooyoung; Lee, Kyusang; Yoo, Jinkyoung; Prasankumar, Rohit P.; Choi, Hyunyong; Jo, Moon-Ho

doi:10.1103/physrevb.101.174309

Title: Role of weak interlayer coupling in ultrafast exciton-exciton annihilation in two-dimensional rhenium dichalcogenides

Journal Article · Tue May 19 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.101.174309· OSTI ID:1739943

Sim, Sangwan ^[1]; Lee, Doeon ^[2]; Lee, Jekwan ^[3]; Cha, Myungjun ^[3]; Cha, Soonyoung ^[4]; Heo, Wonhyeok ^[5]; Cho, Sungjun ^[6]; Shim, Wooyoung ^[6]; Lee, Kyusang ^[2];

^[7];

^[3];

^[8]

Hanyang Univ., Ansan (South Korea); Inst. for Basic Science (IBS), Pohang (South Korea). Center for Artificial Low Dimensional Electronic Systems
Univ. of Virginia, Charlottesville, VA (United States)
Seoul National Univ. (South Korea)
Inst. for Basic Science (IBS), Pohang (South Korea). Center for Artificial Low Dimensional Electronic Systems
Seoul National Univ. (South Korea); Yonsei Univ., Seoul (South Korea)
Yonsei Univ., Seoul (South Korea)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)
Inst. for Basic Science (IBS), Pohang (South Korea). Center for Artificial Low Dimensional Electronic Systems; Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)

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. In this work, we used ultrafast pump-probe spectroscopy to study exciton-exciton interactions in monolayer (1L), bilayer (2L), and triple layer ReS₂. Additionally, 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.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; National Research Foundation of Korea (NRF); National Science Foundation (NSF)

Grant/Contract Number:: 89233218CNA000001; 2019R1F1A1063457; 2018R1A2A1A05079060; 2017M3D1A1040828; 2019R1A5A1027055; CMMI-1825256

OSTI ID:: 1739943

Report Number(s):: LA-UR-20-20522; TRN: US2205506

Journal Information:: Physical Review B, Vol. 101, Issue 17; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Excitons
ultrafast phenomena
transition-metal dichalcogenide
ultrafast pump-probe spectroscopy

Title: Role of weak interlayer coupling in ultrafast exciton-exciton annihilation in two-dimensional rhenium dichalcogenides

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