abstract

• 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 τ D ≲3 ps and the indirect optical transition with τ I≈25 ps. For temperatures between 4 to 150 K τ 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 τ D. The evolution of the direct exciton polarization and intensity as a function of excitation laser energy is monitored in PL excitation experiments. © 2014 AIP Publishing LLC.

authors

• Amand T.
• Balocchi A.
• Bouet L.
• Lagarde D.
• Marie X.
• Urbaszek B.
• Vidal Borbolla Miguel Angel
• Wang G.

publication date

• 2014-01-01

funding provided via

• Seventh Framework Programme, FP7: 306719  Grant

published in

• Applied Physics Letters  Journal

keywords

• Bi-layer; Exciton dynamics

Digital Object Identifier (DOI)

• 10.1063/1.4900945

start page

end page

volume

• 105

issue

• 18