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Proceedings Paper

Intervalley scattering in monolayer MoS2 probed by non-equilibrium optical techniques
Author(s): Stefano Dal Conte; Federico Bottegoni; E. A. A. Pogna; D. De Fazio; S. Ambrogio; I. Bargigia; C. D'Andrea; A. Lombardo; M. Bruna; F. Ciccacci; A. C. Ferrari; G. Cerullo; M. Finazzi
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Paper Abstract

Here we study the exciton valley relaxation dynamics in atomically thin MoS2 by non-equilibrium optical techniques. A spin polarized excitons population is selectively created in a single valley by circularly polarized ultrashort laser pulses resonant with the optical gap, while the subsequent decay of the valley polarization is measured as a rotation of a linearly polarized probe beam due to a transient Faraday effect. We show that the photoinduced valley polarization in monolayer MoS2 is quenched after few ps due to an efficient intervalley scattering channel and it displays a peculiar bi-exponential behavior. This rapid time scale is in a good agreement with an intervalley scattering mechanism mediated by an electron-hole exchange interaction. Moreover time resolved circular dichroism experiments performed in the same experimental condition confirms the fast valley relaxation dynamics observed with transient Faraday rotation technique.

Paper Details

Date Published: 8 September 2015
PDF: 6 pages
Proc. SPIE 9551, Spintronics VIII, 95510W (8 September 2015); doi: 10.1117/12.2186692
Show Author Affiliations
Stefano Dal Conte, IFN-CNR (Italy)
Politecnico di Milano (Italy)
Federico Bottegoni, Politecnico di Milano (Italy)
E. A. A. Pogna, Politecnico di Milano (Italy)
D. De Fazio, Univ. of Cambridge (United Kingdom)
S. Ambrogio, Politecnico di Milano (Italy)
I. Bargigia, Istituto Italiano di Tecnologia (Italy)
C. D'Andrea, Politecnico di Milano (Italy)
Istituto Italiano di Tecnologia (Italy)
A. Lombardo, Univ. of Cambridge (United Kingdom)
M. Bruna, Univ. of Cambridge (United Kingdom)
F. Ciccacci, Univ. of Cambridge (United Kingdom)
A. C. Ferrari, Univ. of Cambridge (United Kingdom)
G. Cerullo, IFN-CNR (Italy)
Politecnico di Milano (Italy)
M. Finazzi, Politecnico di Milano (Italy)

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

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