Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 85: Focus Session: Physics and Application of Emergent 2D-semiconductors and their Heterostructures 2

HL 85.2: Topical Talk

Donnerstag, 10. März 2016, 15:30–16:00, H8

Exciton fine structure in transition-metal dichalcogenides monolayers — •Mikhail Glazov — Ioffe Institute, St.-Petersburg, Russia

Strong spin-orbit interaction in transition-metal dichalcogenides monolayers (TMDCs) such as MoS₂ or WSe₂ results in the spin-valley locking effect: The states of electrons and holes in K_± valleys of the Brillouin zone are spin-split. This makes spin and valley dynamics of charge carriers and their complexes, neutral and charged excitons, in TMCDs non-trivial and interesting. In my talk, an overview of recent theoretical results on exciton and trion fine structure in TMDCs is given. It is shown that the spin/valley dynamics of bright exciton doublet is governed by the long-range exchange interaction between an electron and a hole. The latter provides efficient spin depolarization mechanism of excitons. The developed theory is illustrated by comparison with recent experimental results on time-resolved polarized photoluminescence and Kerr-rotation spectroscopy.