CUED Publications database

Spin-valley dynamics in alloy-based transition metal dichalcogenide heterobilayers

Kravtsov, V and Liubomirov, AD and Cherbunin, RV and Catanzaro, A and Genco, A and Gillard, D and Alexeev, EM and Ivanova, T and Khestanova, E and Shelykh, IA and Tartakovskii, AI and Skolnick, MS and Krizhanovskii, DN and Iorsh, IV (2021) Spin-valley dynamics in alloy-based transition metal dichalcogenide heterobilayers. 2D Materials, 8.

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Abstract

Van der Waals heterobilayers based on 2D transition metal dichalcogenides have been recently shown to support robust and long-lived valley polarization for potential valleytronic applications. However, the roles of the chemical composition and geometric alignment of the constituent layers in the underlying dynamics remain largely unexplored. Here we study spin-valley relaxation dynamics in heterobilayers with different structures and optical properties engineered via the use of alloyed monolayer semiconductors. Through a combination of time-resolved Kerr rotation spectroscopic measurements and theoretical modeling for Mo W Se /WSe samples with different chemical compositions and stacking angles, we uncover the contributions of the interlayer exciton recombination and charge carrier spin depolarization to the overall valley dynamics. We show that the corresponding decay rates can be tuned in a wide range in transitions from a misaligned to an aligned structure, and from a hetero- to a homo-bilayer. Our results provide insights into the microscopic spin-valley polarization mechanisms in van der Waals heterostructures for the development of future 2D valleytronic devices. 1 − x x 2 2

Item Type: Article
Uncontrolled Keywords: cond-mat.mes-hall cond-mat.mes-hall
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Cron Job
Date Deposited: 11 Dec 2020 20:05
Last Modified: 13 Apr 2021 07:05
DOI: 10.1088/2053-1583/abcf12