nl0c00633_si_001.pdf (2.82 MB)
Phonon-Assisted Photoluminescence from Indirect Excitons in Monolayers of Transition-Metal Dichalcogenides
journal contribution
posted on 2020-03-04, 22:43 authored by Samuel Brem, August Ekman, Dominik Christiansen, Florian Katsch, Malte Selig, Cedric Robert, Xavier Marie, Bernhard Urbaszek, Andreas Knorr, Ermin MalicThe
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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many-particle dephasingPhonon-Assisted PhotoluminescenceTMDIndirect Excitonsphonon-assisted recombinationsexciton lineTransition-Metal DichalcogenidesWSe 2 exhibitsPL signalsemission peaksphonon-assisted recombinationtransition-metal dichalcogenidesphoton interactionemission tracesmolybdenum-based materialsmomentum-dark states
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