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Trion fine structure and coupled spin–valley dynamics in monolayer tungsten disulfide
Open accessAbstract
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 WS 2 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.
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Cites
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Self-citationDeterministic transfer of two-dimensional materials by all-dry viscoelastic stamping
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Cited by
Observation of Exciton–Exciton Interaction Mediated Valley Depolarization in Monolayer MoSe2
Mahmood, F., Alpichshev, Z., Lee, Y.-H., Kong, J., & Gedik, N. (2018) · Nano Letters · doi:10.1021/acs.nanolett.7b03953 · Cited by 60
Metadata
- Authors
- Plechinger, G., Nagler, P., Arora, A., Schmidt, R., Chernikov, A., del Águila, A. G., Christianen, P. C. M., Bratschitsch, R., Schüller, C., & Korn, T.
- Venue
- Nature Communications
- Published
- 2016-09-02
- Volume
- 7
- Issue
- 1
- Pages
- 12715-12715
- ISSN
- 2041-1723 (ISSN-L)
- OpenAlex
- W2515342259
- Cited by
- 295
- References
- 50
- FWCI
- 18.04
- Type
- journal article
- Language
- en
- Open access
- gold
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- Plechinger, G., Nagler, P., Arora, A., Schmidt, R., Chernikov, A., del Águila, A. G., Christianen, P. C. M., Bratschitsch, R., Schüller, C., & Korn, T. (2016). Trion fine structure and coupled spin–valley dynamics in monolayer tungsten disulfide. Nature Communications. https://doi.org/10.1038/ncomms12715
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