Exciton fine structure and spin decoherence in monolayers of transition metal dichalcogenides

Abstract

We study the neutral exciton energy spectrum fine structure and its spin dephasing in transition metal dichalcogenides such as MoS${}_2$. The interaction of the mechanical exciton with its macroscopic longitudinal electric field is taken into account. The splitting between the longitudinal and transverse excitons is calculated by means of the both electrodynamical approach and $\mathbf{k}\cdot \mathbf{p}$ perturbation theory. This long-range exciton exchange interaction can induce valley polarization decay. The estimated exciton spin dephasing time is in the picosecond range, in agreement with available experimental data.

5 pages, 3 figures

References in corpus (6)

• Valley polarization in MoS2 monolayers by optical pumping
• Optical Spectrum of MoS${}_2$: Many-body Effects and Diversity of Exciton States
• Large spin splitting in the conduction band of transition metal dichalcogenide monolayers
• Robust optical emission polarization in MoS2 monolayers through selective valley excitation
• Valley Carrier Dynamics in Monolayer Molybdenum Disulphide from Helicity Resolved Ultrafast Pump-probe Spectroscopy
• Unconventional Quantum Hall Effect and Tunable Spin Hall Effect in MoS2 Trilayers

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