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Direct measurement of exciton valley coherence in monolayer WSe2
Open accessAbstract
Coherent valley exciton dynamics are directly probed in a monolayer transition metal dichalcogenide, providing access to the valley coherence time and decoherence mechanisms — crucial for developing methods for manipulating the valley pseudospin. In crystals, energy band extrema in momentum space can be identified by a valley index. The internal quantum degree of freedom associated with valley pseudospin indices can act as a useful information carrier, analogous to electronic charge or spin1,2,3,4. Interest in valleytronics has been revived in recent years following the discovery of atomically thin materials such as graphene and transition metal dichalcogenides5,6,7. However, the valley coherence time—a crucial quantity for valley pseudospin manipulation—is difficult to directly probe. In this work, we use two-dimensional coherent spectroscopy to resonantly generate and detect valley coherence of excitons (Coulomb-bound electron–hole pairs) in monolayer WSe2 (refs 8,9). The imposed valley coherence persists for approximately one hundred femtoseconds. We propose that the electron–hole exchange interaction provides an important decoherence mechanism in addition to exciton population recombination. This work provides critical insight into the requirements and strategies for optical manipulation of the valley pseudospin for future valleytronics applications.
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Metadata
- Authors
- Hao, K., Moody, G., Wu, F., Dass, C. K., Xu, L., Chen, C.-H., Sun, L., Li, M.-Y., Li, L.-J., MacDonald, A. H., & Li, X.
- Venue
- Nature Physics
- Published
- 2016-02-29
- Volume
- 12
- Issue
- 7
- Pages
- 677-682
- ISSN
- 1745-2473 (ISSN-L)
- 1745-2481
- OpenAlex
- W2240067117
- Cited by
- 317
- References
- 47
- FWCI
- 17.61
- Type
- journal article
- Language
- en
- Open access
- green
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