期刊
NANO LETTERS
卷 20, 期 4, 页码 2849-2856出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c00633
关键词
dark excitons; photoluminescence; transition-metal dichalcogenides; exciton-phonon interaction; phonon side bands; microscopic model
类别
资金
- European Unions Horizon 2020 research and innovation program [734690, 785219]
- Swedish Research Council [2018-00734]
- Deutsche Forschungsgemeinschaft (DFG) [182087777, SFB 951, KN 427/11-1]
- ANR 2D-vdW-Spin
- ANR VallEx
- Labex NEXT projects
- ITN Spin-NANO Marie Sklodowska-Curie grant [676108]
- ITN 4PHOTON [721394]
- Marie Curie Actions (MSCA) [676108] Funding Source: Marie Curie Actions (MSCA)
The photoluminescence (PL) spectrum of transition-metal dichalcogenides (TMDs) shows a multitude of emission peaks below the bright exciton line, and not all of them have been explained yet. Here, we study the emission traces of phonon-assisted recombinations of indirect excitons. To this end, we develop a microscopic theory describing simultaneous exciton, phonon, and photon interaction and including consistent many-particle dephasing. We explain the drastically different PL below the bright exciton in tungsten- and molybdenum-based materials as the result of different configurations of bright and momentum-dark states. In good agreement with experiments, our calculations predict that WSe2 exhibits clearly visible low-temperature PL signals stemming from the phonon-assisted recombination of momentum-dark K-K' excitons.
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