TY - JOUR
T1 - Optical Coherence in Atomic-Monolayer Transition-Metal Dichalcogenides Limited by Electron-Phonon Interactions
AU - Dey, P.
AU - Paul, J.
AU - Wang, Z.
AU - Stevens, C. E.
AU - Liu, C.
AU - Romero, A. H.
AU - Shan, J.
AU - Hilton, D. J.
AU - Karaiskaj, D.
N1 - Publisher Copyright:
© 2016 American Physical Society.
Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 2016/3/25
Y1 - 2016/3/25
N2 - We systematically investigate the excitonic dephasing of three representative transition-metal dichalcogenides, namely, MoS2, MoSe2, and WSe2 atomic monolayer thick and bulk crystals, in order to gain a proper understanding of the factors that determine the optical coherence in these materials. Coherent nonlinear optical spectroscopy and temperature dependent absorption, combined with theoretical calculations of the phonon spectra, indicate electron-phonon interactions, to be the limiting factor. Surprisingly, the excitonic dephasing, differs only slightly between atomic monolayers and high quality bulk crystals, which indicates that material imperfections are not the limiting factor in atomically thin monolayer samples. The temperature dependence of the electronic band gap and the excitonic linewidth combined with "ab initio" calculations of the phonon energies and the phonon density of states reveal a strong interaction with the E' and E" phonon modes.
AB - We systematically investigate the excitonic dephasing of three representative transition-metal dichalcogenides, namely, MoS2, MoSe2, and WSe2 atomic monolayer thick and bulk crystals, in order to gain a proper understanding of the factors that determine the optical coherence in these materials. Coherent nonlinear optical spectroscopy and temperature dependent absorption, combined with theoretical calculations of the phonon spectra, indicate electron-phonon interactions, to be the limiting factor. Surprisingly, the excitonic dephasing, differs only slightly between atomic monolayers and high quality bulk crystals, which indicates that material imperfections are not the limiting factor in atomically thin monolayer samples. The temperature dependence of the electronic band gap and the excitonic linewidth combined with "ab initio" calculations of the phonon energies and the phonon density of states reveal a strong interaction with the E' and E" phonon modes.
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U2 - 10.1103/PhysRevLett.116.127402
DO - 10.1103/PhysRevLett.116.127402
M3 - Article
AN - SCOPUS:84962685224
VL - 116
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 12
M1 - 127402
ER -