Plechinger, Gerd and Nagler, Philipp and Arora, Ashish and del Aguila, Andres Granados and Ballottin, Mariana V. and Frank, Tobias and Steinleitner, Philipp and Gmitra, Martin and Fabian, Jaroslav and Christianen, Peter C. M. and Bratschitsch, Rudolf and Schueller, Christian and Korn, Tobias (2016) Excitonic Valley Effects in Monolayer WS2 under High Magnetic Fields. NANO LETTERS, 16 (12). pp. 7899-7904. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)Abstract
Transition-metal dichalcogenides can be easily produced as atomically thin sheets, exhibiting the possibility to optically polarize and read out the valley pseudospin of extremely stable excitonic quasiparticles present in these 2D semiconductors. Here, we investigate a monolayer of tungsten disulfide in high magnetic fields up to 30 T-via photoluminescence spectroscopy at low temperatures. The valley degeneracy is lifted for all optical features, particularly for excitons, singlet and triplet trions, for which we determine the g factor separately. While the observation of a diamagnetic shift of the exciton and trion resonances gives us insight into the real-space extension of these quasiparticles, magnetic field induced valley polarization effects shed light onto the exciton and trion dispersion relations in reciprocal space. The field dependence of the trion valley polarizations is in line with the predicted trion splitting into singlet and triplet configurations.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION-METAL DICHALCOGENIDES; CHARGED EXCITONS; WSE2; MOS2; SEMICONDUCTOR; POLARIZATION; BIEXCITONS; DYNAMICS; SPIN; IDENTIFICATION; Transition metal dichalcogenides; WS2; 2D materials; excitons; valley splitting; valley polarization |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Apr 2019 08:21 |
| Last Modified: | 10 Apr 2019 08:21 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3863 |
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