Journal
NANOSCALE
Volume 6, Issue 21, Pages 12690-12695Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr03607g
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Funding
- US National Science Foundation [DMR-0954486, EPSCoR-1430493]
- National Basic Research Program 973 of China [2011CB932700, 2011CB932703]
- Chinese Natural Science Foundation [61335006, 61378073]
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We study valley and spin dynamics in monolayer molybdenum diselenide by polarization-resolved femto-second transient absorption spectroscopy. Valley-and spin-polarized excitons are injected by a circularly polarized laser pulse, with an excess energy of 120 meV. Relaxation of the valley polarization is time-resolved by measuring dynamical circular dichroism of a linearly polarized probe pulse tuned to 790 nm, the peak of the exciton resonance of monolayer MoSe2. We obtain a valley relaxation time of 9 +/- 3 ps at room temperature, which is at least one order of magnitude shorter than the simultaneously measured exciton lifetime. The results illustrate potential applications of MoSe2 in room-temperature valleytronic and spintronic devices.
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