期刊
PHYSICAL REVIEW LETTERS
卷 113, 期 26, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.266804
关键词
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资金
- U.S. Department of Energy, Office of Basic Energy Sciences through Columbia Energy Frontier Research Center [DE-SC0001085]
- National Science Foundation [DMR-1122594, DMR-1124894, DMR-1106225, DMR-1157490]
- NSF through an IGERT Fellowship [DGE-1069240]
- NSF
- Alexander von Humboldt Foundation
- NHMFL UCGP [5087]
- State of Florida
- U.S. Department of Energy
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1124894, 1106225] Funding Source: National Science Foundation
We have measured circularly polarized photoluminescence in monolayer MoSe2 under perpendicular magnetic fields up to 10 T. At low doping densities, the neutral and charged excitons shift linearly with field strength at a rate of -/+ 0.12 meV/T for emission arising, respectively, from the K and K' valleys. The opposite sign for emission from different valleys demonstrates lifting of the valley degeneracy. The magnitude of the Zeeman shift agrees with predicted magnetic moments for carriers in the conduction and valence bands. The relative intensity of neutral and charged exciton emission is modified by the magnetic field, reflecting the creation of field-induced valley polarization. At high doping levels, the Zeeman shift of the charged exciton increases to -/+ 0.18 meV/T. This enhancement is attributed to many-body effects on the binding energy of the charged excitons.
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