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Issue 21, 2014
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Valley and spin dynamics in MoSe2 two-dimensional crystals

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Abstract

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.

Graphical abstract: Valley and spin dynamics in MoSe2 two-dimensional crystals

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Publication details

The article was received on 27 Jun 2014, accepted on 20 Aug 2014 and first published on 22 Aug 2014


Article type: Paper
DOI: 10.1039/C4NR03607G
Citation: Nanoscale, 2014,6, 12690-12695
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    Valley and spin dynamics in MoSe2 two-dimensional crystals

    N. Kumar, J. He, D. He, Y. Wang and H. Zhao, Nanoscale, 2014, 6, 12690
    DOI: 10.1039/C4NR03607G

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