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Phonon-assisted Photoluminescence from Dark Excitons in Monolayers of Transition Metal Dichalcogenides
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abstract
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 momentum-dark 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 result of different configurations of bright and dark states. In good agreement with experiments, we show that WSe$_2$ exhibits clearly visible low-temperature PL signals stemming from the phonon-assisted recombination of momentum-dark excitons.
Forward citations
Cited by 3 Pith papers
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Negative excitonic diffusion in transition metal dichalcogenides
At 20 K, optically excited excitons in monolayer WS2 are predicted to exhibit transient negative diffusion, with their spatial distribution narrowing for tens of picoseconds due to intervalley exciton-phonon scattering.
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Quenching of Intervalley Exchange Coupling in the Presence of Momentum-Dark States in TMDCs
In WSe2, phonon scattering moves excitons into momentum-dark states that do not couple valleys, quenching intervalley exchange coupling and extending valley lifetimes to nanoseconds, unlike in MoSe2 where lifetimes ar...
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Optical fingerprint of bright and dark localized excitonic states in atomically thin 2D materials
In disordered WSe2, localized bright and momentum-dark excitons produce distinct photoluminescence peaks, with a temperature- and disorder-width-dependent crossover between localization-dominated and phonon-dominated spectra.
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