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Coupled Spin and Valley Physics in Monolayers ofMoS2and Other Group-VI Dichalcogenides
Open accessAbstract
We show that inversion symmetry breaking together with spin-orbit coupling leads to coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides, making possible controls of spin and valley in these 2D materials. The spin-valley coupling at the valence-band edges suppresses spin and valley relaxation, as flip of each index alone is forbidden by the valley-contrasting spin splitting. Valley Hall and spin Hall effects coexist in both electron-doped and hole-doped systems. Optical interband transitions have frequency-dependent polarization selection rules which allow selective photoexcitation of carriers with various combination of valley and spin indices. Photoinduced spin Hall and valley Hall effects can generate long lived spin and valley accumulations on sample boundaries. The physics discussed here provides a route towards the integration of valleytronics and spintronics in multivalley materials with strong spin-orbit coupling and inversion symmetry breaking.
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Cites
Electric Field Effect in Atomically Thin Carbon Films
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Experimental observation of the quantum Hall effect and Berry's phase in graphene
Zhang, Y., Tan, Y.-W., Stormer, H. L., & Kim, P. (2005) · Nature · doi:10.1038/nature04235 · Cited by 13,435
Two-dimensional atomic crystals
Novoselov, K. S., Jiang, D., Schedin, F., Booth, T. J., Khotkevich, V. V., Morozov, S. V., & Geim, A. K. (2005) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0502848102 · Cited by 11,788
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Cited by
Electronics and optoelectronics of two-dimensional transition metal dichalcogenides
Wang, Q. H., Kalantar-Zadeh, K., Kis, A., Coleman, J. N., & Strano, M. S. (2012) · Nature Nanotechnology · doi:10.1038/nnano.2012.193 · Cited by 16,374
The chemistry of two-dimensional layered transition metal dichalcogenide nanosheets
Chhowalla, M., Shin, H. S., Eda, G., Li, L.-J., Loh, K. P., & Zhang, H. (2013) · Nature Chemistry · doi:10.1038/nchem.1589 · Cited by 10,034
Progress, Challenges, and Opportunities in Two-Dimensional Materials Beyond Graphene
Butler, S. Z., Hollen, S. M., Cao, L., Cui, Y., Gupta, J. A., Gutiérrez, H. R., Heinz, T. F., Hong, S. S., Huang, J., Ismach, A. F., et al. (2013) · ACS Nano · doi:10.1021/nn400280c · Cited by 4,878
Photonics and optoelectronics of 2D semiconductor transition metal dichalcogenides
Mak, K. F., & Shan, J. (2016) · Nature Photonics · doi:10.1038/nphoton.2015.282 · Cited by 3,819
Spin and pseudospins in layered transition metal dichalcogenides
Xu, X., Yao, W., Xiao, D., & Heinz, T. F. (2014) · Nature Physics · doi:10.1038/nphys2942 · Cited by 2,855
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Metadata
- Authors
- Xiao, D., Liu, G.-B., Feng, W., Xu, X., & Yao, W.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2012-05-07
- Volume
- 108
- Issue
- 19
- Pages
- 196802-196802
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2034932701
- Cited by
- 5,152
- References
- 5
- FWCI
- 95.42
- Type
- journal article
- Language
- en
- Open access
- green
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- Xiao, D., Liu, G.-B., Feng, W., Xu, X., & Yao, W. (2012). Coupled Spin and Valley Physics in Monolayers ofMoS2and Other Group-VI Dichalcogenides. Physical Review Letters. https://doi.org/10.1103/physrevlett.108.196802
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