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Breaking of Valley Degeneracy by Magnetic Field in MonolayerMoSe2
Open accessAbstract
Using polarization-resolved photoluminescence spectroscopy, we investigate the breaking of valley degeneracy by an out-of-plane magnetic field in back-gated monolayer MoSe2 devices. We observe a linear splitting of -0.22 meV/T between luminescence peak energies in σ+ and σ- emission for both neutral and charged excitons. The optical selection rules of monolayer MoSe2 couple the photon handedness to the exciton valley degree of freedom; so this splitting demonstrates valley degeneracy breaking. In addition, we find that the luminescence handedness can be controlled with a magnetic field to a degree that depends on the back-gate voltage. An applied magnetic field, therefore, provides effective strategies for control over the valley degree of freedom.
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Cites
Quantum Theory of Cyclotron Resonance in Semiconductors: General Theory
Luttinger, J. M. (1956) · Physical Review · doi:10.1103/physrev.102.1030 · Cited by 2,199
Cited by
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
Self-citationSchaibley, J. R., Yu, H., Clark, G., Rivera, P., Ross, J. S., Seyler, K. L., Yao, W., & Xu, X. (2016) · Nature Reviews Materials · doi:10.1038/natrevmats.2016.55 · Cited by 2,652
Single quantum emitters in monolayer semiconductors
He, Y.-M., Clark, G., Schaibley, J. R., He, Y., Chen, M.-C., Wei, Y.-J., Ding, X., Zhang, Q., Yao, W., Xu, X., et al. (2015) · Nature Nanotechnology · doi:10.1038/nnano.2015.75 · Cited by 1,020
Concepts of ferrovalley material and anomalous valley Hall effect
Tong, W.-Y., Gong, S.-J., Wan, X., & Duan, C.-G. (2016) · Nature Communications · doi:10.1038/ncomms13612 · Cited by 641
Valley Vortex States in Sonic Crystals
Lu, J., Qiu, C., Ke, M., & Liu, Z. (2016) · Physical Review Letters · doi:10.1103/physrevlett.116.093901 · Cited by 448
Metadata
- Authors
- MacNeill, D., Heikes, C., Mak, K. F., Anderson, Z., Kormányos, A., Zólyomi, V., Park, J., & Ralph, D. C.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2015-01-22
- Volume
- 114
- Issue
- 3
- Pages
- 037401-037401
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2044480396
- Cited by
- 764
- References
- 1
- FWCI
- 27.71
- Type
- journal article
- Language
- en
- Open access
- bronze
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- MacNeill, D., Heikes, C., Mak, K. F., Anderson, Z., Kormányos, A., Zólyomi, V., Park, J., & Ralph, D. C. (2015). Breaking of Valley Degeneracy by Magnetic Field in MonolayerMoSe2. Physical Review Letters. https://doi.org/10.1103/physrevlett.114.037401
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