Valley Splitting and Polarization by the Zeeman Effect in Monolayer
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- 23 December 2014
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 113 (26), 266804
- https://doi.org/10.1103/physrevlett.113.266804
Abstract
We have measured circularly polarized photoluminescence in monolayer 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 for emission arising, respectively, from the and 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 . This enhancement is attributed to many-body effects on the binding energy of the charged excitons.
Keywords
Funding Information
- National Science Foundation (DMR-1122594, DMR-1124894, DMR-1106225, DMR-1157490)
- American Friends of the Alexander von Humboldt Foundation
- Columbia Energy Frontier Research Center (DE-SC0001085)
- NHMFL (5087)
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