Journal
APPLIED PHYSICS LETTERS
Volume 101, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4768299
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- NRL
- NRL Nanoscience Institute
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We probe the degree of circular polarization of the emitted photoluminescence from a single MoS2 as a function of the circularly polarized photo-excitation energy. A Single layer of MoS2 has strong emission at around 1.9 eV associated with a direct transition at the K-point of the Brillouin zone. The circular polarization of the photoluminescence is very high for excitation near the bandgap and has a power-law decrease as the excitation energy increases. We identify phonon-assisted intervalley scattering as the primary spin relaxation mechanism and present a model that explains the wide variation in values for the polarization reported in the literature. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4768299]
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