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

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

doi:10.1063/1.4916089

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

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

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144 Citations (Scopus)

Abstract

We investigate valley exciton dynamics in MoSe₂ monolayers in polarization- and time-resolved photoluminescence (PL) spectroscopy at 4 K. 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 experiments. Fast PL emission times are recorded for both the neutral exciton of ≤3 ps and for the charged exciton (trion) of 12 ps.

Original language	English
Article number	112101
Journal	Applied Physics Letters
Volume	106
Issue number	11
DOIs	https://doi.org/10.1063/1.4916089
Publication status	Published - 16 Mar 2015
Externally published	Yes

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abstract = "We investigate valley exciton dynamics in MoSe2 monolayers in polarization- and time-resolved photoluminescence (PL) spectroscopy at 4 K. 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 experiments. Fast PL emission times are recorded for both the neutral exciton of ≤3 ps and for the charged exciton (trion) of 12 ps.",

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AU - Wang, G.

AU - Palleau, E.

AU - Amand, T.

AU - Tongay, S.

AU - Marie, X.

AU - Urbaszek, B.

PY - 2015/3/16

Y1 - 2015/3/16

N2 - We investigate valley exciton dynamics in MoSe2 monolayers in polarization- and time-resolved photoluminescence (PL) spectroscopy at 4 K. 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 experiments. Fast PL emission times are recorded for both the neutral exciton of ≤3 ps and for the charged exciton (trion) of 12 ps.

AB - We investigate valley exciton dynamics in MoSe2 monolayers in polarization- and time-resolved photoluminescence (PL) spectroscopy at 4 K. 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 experiments. Fast PL emission times are recorded for both the neutral exciton of ≤3 ps and for the charged exciton (trion) of 12 ps.

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VL - 106

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

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