Wang, Gang and Chernikov, Alexey and Glazov, Mikhail M. and Heinz, Tony F. and Marie, Xavier and Amand, Thierry and Urbaszek, Bernhard (2018) Colloquium: Excitons in atomically thin transition metal dichalcogenides. REVIEWS OF MODERN PHYSICS, 90 (2): 021001. ISSN 0034-6861, 1539-0756
Full text not available from this repository.Abstract
Atomically thin materials such as graphene and monolayer transition metal dichalcogenides (TMDs) exhibit remarkable physical properties resulting from their reduced dimensionality and crystal symmetry. The family of semiconducting transition metal dichalcogenides is an especially promising platform for fundamental studies of two-dimensional (2D) systems, with potential applications in optoelectronics and valleytronics due to their direct band gap in the monolayer limit and highly efficient light-matter coupling. A crystal lattice with broken inversion symmetry combined with strong spin-orbit interactions leads to a unique combination of the spin and valley degrees of freedom. In addition, the 2D character of the monolayers and weak dielectric screening from the environment yield a significant enhancement of the Coulomb interaction. The resulting formation of bound electron-hole pairs, or excitons, dominates the optical and spin properties of the material. Here recent progress in understanding of the excitonic properties in monolayer TMDs is reviewed and future challenges are laid out. Discussed are the consequences of the strong direct and exchange Coulomb interaction, exciton light-matter coupling, and influence of finite carrier and electron-hole pair densities on the exciton properties in TMDs. Finally, the impact on valley polarization is described and the tuning of the energies and polarization observed in applied electric and magnetic fields is summarized.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GIANT BANDGAP RENORMALIZATION; VAPOR-PHASE GROWTH; SINGLE-LAYER MOS2; MONOLAYER MOS2; MONO LAYER; VALLEY POLARIZATION; QUANTUM-WELLS; SPIN DYNAMICS; LARGE-AREA; ELECTRONIC-PROPERTIES; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Mar 2020 13:39 |
| Last Modified: | 10 Mar 2020 13:39 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14748 |
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