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Proceedings Paper

Spin and valley properties in tunable 2D materials and artificial van der Waals solids (Conference Presentation)
Author(s): Ursula Wurstbauer

Paper Abstract

Monolayers of semiconducting transition metal dichalcogenides excel due to their strong exciton dominated light matter interaction. We focus on monolayer MoS2 field effect structures and demonstrate that the degree of valley polarization that typically vanishes at elevated temperature can be restored even at room temperature by increasing the electron density. The recovering of the valley polarization via doping is linked to the suppression of the Fröhlich exciton LO-phonon interaction that mediates a uniaxial long-range oscillating electric field braking the three-fold rotational symmetry. Our results provide a promising strategy to increase the degree of valley polarization towards room temperature valleytronic applications.

Paper Details

Date Published: 10 March 2020
Proc. SPIE 11282, 2D Photonic Materials and Devices III, 112820C (10 March 2020); doi: 10.1117/12.2550455
Show Author Affiliations
Ursula Wurstbauer, Westfälische Wilhelms-Univ. Münster (Germany)

Published in SPIE Proceedings Vol. 11282:
2D Photonic Materials and Devices III
Arka Majumdar; Carlos M. Torres Jr.; Hui Deng, Editor(s)

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