Replies to post #35113 on Quantum Materials Corp. (fka QTMM)

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Polarization and time-resolved photoluminescence spectroscopy of excitons in MoSe2 monolayers

G. Wang, E. Palleau, T. Amand, S. Tongay, X. Marie, B. Urbaszek

(Submitted on 12 Feb 2015)

We investigate valley exciton dynamics in MoSe2 monolayers in polarization- and time-resolved photoluminescence (PL) spectroscopy at 4K. Following circularly polarized laser excitation, we record a low circular polarization degree of the PL of typically =5%. This is about 10 times lower than the polarization induced under comparable conditions in MoS2 and WSe2 monolayers. The evolution of the exciton polarization as a function of excitation laser energy and power is monitored in PL excitation (PLE) experiments. Fast PL emission times are recorded for both the neutral exciton of =3 ps and for the charged exciton (trion) of 12 ps.

http://arxiv.org/abs/1502.03591