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10 March 2020 Spin and valley properties in tunable 2D materials and artificial van der Waals solids (Conference Presentation)
Ursula Wurstbauer
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Proceedings Volume 11282, 2D Photonic Materials and Devices III; 112820C (2020) https://doi.org/10.1117/12.2550455
Event: SPIE OPTO, 2020, San Francisco, California, United States
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.
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Ursula Wurstbauer "Spin and valley properties in tunable 2D materials and artificial van der Waals solids (Conference Presentation)", Proc. SPIE 11282, 2D Photonic Materials and Devices III, 112820C (10 March 2020); https://doi.org/10.1117/12.2550455
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KEYWORDS
Solids
Excitons
Dielectric polarization
Doping
Excel
Integrated circuit design
Integrated circuits
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