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Nanoscale. 2014 Nov 7;6(21):12690-5. doi: 10.1039/c4nr03607g.

Valley and spin dynamics in MoSe2 two-dimensional crystals.

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Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, USA.


We study valley and spin dynamics in monolayer molybdenum diselenide by polarization-resolved femtosecond 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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