CUED Publications database

Intervalley scattering in monolayer MoS<inf>2</inf> probed by non-equilibrium optical techniques

Dal Conte, S and Bottegoni, F and Pogna, EAA and De Fazio, D and Ambrogio, S and Bargigia, SI and D'Andrea, C and Lombardo, A and Bruna, M and Ciccacci, F and Ferrari, AC and Cerullo, G and Finazzi, M (2015) Intervalley scattering in monolayer MoS<inf>2</inf> probed by non-equilibrium optical techniques. In: UNSPECIFIED.

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© 2015 SPIE. Here we study the exciton valley relaxation dynamics in atomically thin MoS2 by non equilibrium optical tech- niques. 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 MoS 2 is quenched after few ps due to an efficient intervalley scat- tering 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.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div B > Solid State Electronics and Nanoscale Science
Div B > Photonics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:58
Last Modified: 15 Jun 2018 20:27