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Proceedings Paper

Time-resolved spectroscopy of coupled spin-valley-dynamics in monolayer transition metal dichalcogenides at low temperatures
Author(s): Gerd Plechinger; Philipp Nagler; Christian Schüller; Tobias Korn
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Paper Abstract

We demonstrate the exfoliation of large-area monolayer flakes prepared from bulk MoS2 crystals. The flakes are first characterized using Raman and photoluminescence measurements. We then utilize time-resolved Kerr rotation (TRKR) measurements to probe the valley dynamics in the monolayer flakes at low temperatures. This technique allows resonant excitation of the excitonic transitions and yields sub-picosecond resolution. We find valley lifetimes of about 40 ps at a temperature of 4 K in monolayer MoS2 for resonant excitation. With increasing temperatures, we observe a dramatic decrease of the valley lifetimes, indicating that valley dephasing is mediated by phonon-related scattering processes.

Paper Details

Date Published: 8 September 2015
PDF: 6 pages
Proc. SPIE 9551, Spintronics VIII, 95510V (8 September 2015); doi: 10.1117/12.2186402
Show Author Affiliations
Gerd Plechinger, Univ. Regensburg (Germany)
Philipp Nagler, Univ. Regensburg (Germany)
Christian Schüller, Univ. Regensburg (Germany)
Tobias Korn, Univ. Regensburg (Germany)

Published in SPIE Proceedings Vol. 9551:
Spintronics VIII
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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