Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4900945
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Funding
- ERC [306719]
- Programme Investissements d'Avenir [ANR-11-IDEX-0002-02, ANR-10-LABX-0037-NEXT]
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We investigate exciton dynamics in WSe2 bilayers in time-resolved photoluminescence (PL) spectroscopy. Fast PL emission times are recorded for both the direct exciton with tau(D) less than or similar to 3 ps and the indirect optical transition with tau(I) approximate to 25 ps. For temperatures between 4 to 150K tau(I) remains constant. Following polarized laser excitation, we observe for the direct exciton transition at the K point of the Brillouin zone efficient optical orientation and alignment during the short emission time tau(D). The evolution of the direct exciton polarization and intensity as a function of excitation laser energy is monitored in PL excitation experiments. (C) 2014 AIP Publishing LLC.
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