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

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

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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.

Original languageEnglish (US)
Article number112101
JournalApplied Physics Letters
Volume106
Issue number11
DOIs
StatePublished - Mar 16 2015

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excitons
photoluminescence
polarization
spectroscopy
excitation
circular polarization
lasers
valleys
energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Polarization and time-resolved photoluminescence spectroscopy of excitons in MoSe2 monolayers. / Wang, G.; Palleau, E.; Amand, T.; Tongay, Sefaattin; Marie, X.; Urbaszek, B.

In: Applied Physics Letters, Vol. 106, No. 11, 112101, 16.03.2015.

Research output: Contribution to journalArticle

Wang, G. ; Palleau, E. ; Amand, T. ; Tongay, Sefaattin ; Marie, X. ; Urbaszek, B. / Polarization and time-resolved photoluminescence spectroscopy of excitons in MoSe2 monolayers. In: Applied Physics Letters. 2015 ; Vol. 106, No. 11.
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