Fast Relaxation of Photo-Excited Carriers in 2-D Transition Metal Dichalcogenides

Fast Relaxation of Photo-Excited Carriers in 2-D Transition Metal Dichalcogenides

We predict a fast relaxation of photo-excited carriers in monolayer transition metal dichalcogenides, which is mediated by the emission of longitudinal optical (LO) and homopolar (HP) phonons. By evaluating Born effective charges for MoS 2 , MoSe 2 , WS 2 , and WSe 2 , we find that, due to the polar...

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Veröffentlicht in:IEEE journal of selected topics in quantum electronics 2017-01, Vol.23 (1), p.168-172
Hauptverfasser: Danovich, Mark, Aleiner, Igor L., Drummond, Neil D., Fal'ko, Vladimir I.
Format: Artikel
Sprache:eng
Schlagworte:
Charge carrier processes
Couplings
Optical coupling
Optical scattering
optoelectronics
Phonons
Stimulated emission
TMDCs
ultrafast relaxation
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Beschreibung
Zusammenfassung:We predict a fast relaxation of photo-excited carriers in monolayer transition metal dichalcogenides, which is mediated by the emission of longitudinal optical (LO) and homopolar (HP) phonons. By evaluating Born effective charges for MoS 2 , MoSe 2 , WS 2 , and WSe 2 , we find that, due to the polar coupling of electrons with LO phonons, and the HP phonons lattice deformation potential, the cooling times for hot electrons and holes from excitation energies of several hundred meV are at ps-scale.
ISSN:1077-260X
1558-4542
DOI:10.1109/JSTQE.2016.2583059