Abstract
We report direct measurements of intrinsic lifetimes of P-type dark-excitons in MoS2 monolayers. Using sub-gap excitation, we demonstrate two-photon excited direct population of P-type dark excitons, observe their scattering to bright states and decay with femtosecond resolution. In contrast to one-photon excitation schemes, non-monotonic density variation in bright exciton population observed under two-photon excitation shows the indirect nature of its population and competing decay pathways. Detailed modeling of different recombination pathways of bright and dark excitons allows experimental measurement of 2P dark → 1S bright exciton scattering rates. These insights into the dark states in a MoS2 monolayer pave the way for novel devices such as quantum memories and computing.
Original language | American English |
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Pages (from-to) | 33427-33435 |
Number of pages | 9 |
Journal | Optics Express |
Volume | 27 |
Issue number | 23 |
DOIs | |
State | Published - 2019 |
Bibliographical note
Funding Information:Israel Science Foundation (1363/15, 1995/17, 2220/15, 934/18).
Publisher Copyright:
© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement