Plechinger, Gerd and Nagler, Philipp and Arora, Ashish and Schmidt, Robert and Chernikov, Alexey and del Aguila, Andres Granados and Christianen, Peter C. M. and Bratschitsch, Rudolf and Schueller, Christian and Korn, Tobias (2016) Trion fine structure and coupled spin-valley dynamics in monolayer tungsten disulfide. NATURE COMMUNICATIONS, 7: 12715. ISSN 2041-1723,
Full text not available from this repository. (Request a copy)Abstract
Monolayer transition-metal dichalcogenides have recently emerged as possible candidates for valleytronic applications, as the spin and valley pseudospin are directly coupled and stabilized by a large spin splitting. The optical properties of these two-dimensional crystals are dominated by tightly bound electron-hole pairs (excitons) and more complex quasiparticles such as charged excitons (trions). Here we investigate monolayer WS2 samples via photoluminescence and time-resolved Kerr rotation. In photoluminescence and in energy-dependent Kerr rotation measurements, we are able to resolve two different trion states, which we interpret as intravalley and intervalley trions. Using time-resolved Kerr rotation, we observe a rapid initial valley polarization decay for the A exciton and the trion states. Subsequently, we observe a crossover towards exciton-exciton interaction-related dynamics, consistent with the formation and decay of optically dark A excitons. By contrast, resonant excitation of the B exciton transition leads to a very slow decay of the Kerr signal.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION-METAL DICHALCOGENIDES; EXCITON BINDING-ENERGY; MOS2; WSE2; WS2; BIEXCITONS; SEMICONDUCTOR; SPECTROSCOPY; POLARIZATION; RELAXATION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Apr 2019 11:46 |
| Last Modified: | 04 Apr 2019 11:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3385 |
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