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Journal Articles Applied Physics Letters Year : 2014

Exciton dynamics in WSe 2 bilayers


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 τD ≲ 3 ps and the indirect optical transition with τI ≈ 25 ps. For temperatures between 4 to 150 K τI 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 τD. The evolution of the direct exciton polarization and intensity as a function of excitation laser energy is monitored in PL excitation experiments.
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Dates and versions

hal-02052136 , version 1 (28-02-2019)


  • HAL Id : hal-02052136 , version 1


Gang Wang, Xavier Marie, Louis Bouet, M. Vidal, Andrea Balocchi, et al.. Exciton dynamics in WSe 2 bilayers. Applied Physics Letters, 2014, 105 (18), pp.182105. ⟨hal-02052136⟩
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