Breaking of valley degeneracy by magnetic field in monolayer MoSe2

David Macneill, Colin Heikes, Kin Fai Mak, Zachary Anderson, Andor Kormányos, Viktor Zólyomi, Jiwoong Park, Daniel C. Ralph

Research output: Contribution to journalArticlepeer-review

527 Scopus citations


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 -0.22meV/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.

Original languageEnglish (US)
Article number037401
JournalPhysical review letters
Issue number3
StatePublished - Jan 22 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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