Breaking of Valley Degeneracy by Magnetic Field in Monolayer MoSe2

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2015
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MacNeill, David
Heikes, Colin
Mak, Kin Fai
Anderson, Zackary
Zólyomi, Viktor
Park, Jiwoong
Ralph, Daniel C.
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Physical Review Letters. 2015, 114(3), 037401. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.114.037401
Zusammenfassung

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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ISO 690MACNEILL, David, Colin HEIKES, Kin Fai MAK, Zackary ANDERSON, Andor KORMÁNYOS, Viktor ZÓLYOMI, Jiwoong PARK, Daniel C. RALPH, 2015. Breaking of Valley Degeneracy by Magnetic Field in Monolayer MoSe2. In: Physical Review Letters. 2015, 114(3), 037401. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.114.037401
BibTex
@article{MacNeill2015Break-31056,
  year={2015},
  doi={10.1103/PhysRevLett.114.037401},
  title={Breaking of Valley Degeneracy by Magnetic Field in Monolayer MoSe<sub>2</sub>},
  number={3},
  volume={114},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={MacNeill, David and Heikes, Colin and Mak, Kin Fai and Anderson, Zackary and Kormányos, Andor and Zólyomi, Viktor and Park, Jiwoong and Ralph, Daniel C.},
  note={Article Number: 037401}
}
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