Spin and valley dynamics of excitons in transition metal dichalcogenide monolayers

By M. Glazov, E. Ivchenko, Gang Wang, T. Amand, Xavier Marie, Bernhard Urbaszek, B. Liu. 2015

133 citations recorded by the source corpus.

Monolayers of transition metal dichalcogenides, namely, molybdenum and tungsten disulfides and diselenides demonstrate unusual optical properties related to the spin–valley locking effect. Particularly, excitation of monolayers by circularly polarized light selectively creates electron–hole pairs or excitons in non‐equivalent valleys in momentum space, depending on the light helicity. This allows studying the inter‐valley dynamics of charge carriers and Coulomb complexes by means of optical spectroscopy. Here, we present a concise review of the neutral exciton fine structure and its spin and valley dynamics in monolayers of transition metal dichalcogenides. It is demonstrated that the long‐range exchange interaction between an electron and a hole in the exciton is an efficient mechanism for rapid mixing between bright excitons made of electron–hole pairs in different valleys. We discuss the physical origin of the long‐range exchange interaction and outline its derivation in both the electrodynamical and k·p approaches. We further present a model of bright exciton spin dynamics driven by an interplay between the long‐range exchange interaction and scattering. Finally, we discuss the application of the model to describe recent experimental data obtained by time‐resolved photoluminescence and Kerr rotation techniques.

Subfields: Materials Chemistry, Physical and Theoretical Chemistry

View Paper: https://www.semanticscholar.org/paper/9d07326362ed234ebf9da960b4a72660b17e122a

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In Materials Chemistry

1. Takashi Taniguchi
2. Kenji Watanabe
3. T. Amand
4. Xavier Marie
5. Bernhard Urbaszek
6. Gang Wang
7. S. Tongay
8. M. Potemski

In Physical and Theoretical Chemistry

1. Kenji Watanabe
2. Takashi Taniguchi
3. M. Potemski

Citations in the corpus

• Optical properties of atomically thin transition metal dichalcogenides: observations and puzzles (2016, background): “[115] Glazov MM, Ivchenko EL, Wang G, Amand T, Marie X, Urbaszek B, Liu BL.”
• Excitonic linewidth approaching the homogeneous limit in MoS2-based van der Waals heterostructures (2017, background): “[79,82] for details of this process in TMDC monolayers.”