Fast relaxation of photo-excited carriers in 2D transition metal dichalcogenides
Mark Danovich, Igor Aleiner, Neil D. Drummond, Vladimir Fal'ko
TL;DR
This paper predicts that photo-excited carriers in monolayer TMDCs relax rapidly within a few picoseconds due to emission of LO phonons, driven by polar electron-phonon coupling.
Contribution
It provides a theoretical prediction of ultrafast carrier relaxation times in TMDC monolayers based on phonon emission mechanisms.
Findings
Relaxation times are a few picoseconds for hot electrons and holes.
Polar coupling with LO phonons mediates the fast relaxation.
The study evaluates Born effective charges for multiple TMDCs.
Abstract
We predict a fast relaxation of photo-excited carriers in monolayer transition metal dichalcogenides (TMDCs), which is mediated by the emission of longitudinal optical (LO) phonons. By evaluating Born effective charges for , and , we find that, due to the polar coupling of electrons with LO phonons, the relaxation times for hot electrons and holes are of the order of a few ps.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.