Phonon-Assisted Photoluminescence from Indirect Excitons in Monolayers of Transition-Metal Dichalcogenides
Artikel i vetenskaplig tidskrift, 2020
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.
exciton-phonon interaction
microscopic model
dark excitons
transition-metal dichalcogenides
phonon side bands
photoluminescence
Författare
Samuel Brem
Chalmers, Fysik, Kondenserad materie- och materialteori
August Ekman
Chalmers, Fysik
Dominik Christiansen
Technische Universität Berlin
Florian Katsch
Technische Universität Berlin
M. Selig
Technische Universität Berlin
Cedric Robert
Universite Paul Sabatier Toulouse III
Xavier Marie
Universite Paul Sabatier Toulouse III
Bernhard Urbaszek
Universite Paul Sabatier Toulouse III
A. Knorr
Technische Universität Berlin
Ermin Malic
Chalmers, Fysik, Kondenserad materie- och materialteori
2D-Tech
Nano Letters
1530-6984 (ISSN) 1530-6992 (eISSN)
Vol. 20 4 2849-2856Excitondynamik i atomiskt tunna material
Vetenskapsrådet (VR) (2018-00734), 2019-01-01 -- 2024-12-31.
Ämneskategorier
Den kondenserade materiens fysik
DOI
10.1021/acs.nanolett.0c00633
PubMed
32084315