Room temperature valley polarization in transition metal dichalcogenide/chiral perovskite heterostructures

Shreetu Shrestha; Mingxing Li; Mircea Cotlet

doi:10.1117/12.2650947

17 March 2023 Room temperature valley polarization in transition metal dichalcogenide/chiral perovskite heterostructures

Shreetu Shrestha, Mingxing Li, Mircea Cotlet

Author Affiliations +

Proceedings Volume PC12423, 2D Photonic Materials and Devices VI; (2023) https://doi.org/10.1117/12.2650947
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

2D transition metal dichalcogenides have two degenerate valleys which can be used to store and process information for quantum computing and communications. Here we report robust valley polarization in monolayer TMDs/chiral perovskite heterostructures at room temperature. We control valley index in monolayer TMDs via spin selective charge extraction with chiral perovskite and obtain 7% degree of polarization. We further investigate the charge transfer dynamics in the heterostructures by measuring transient absorption using pump-probe spectroscopy and show that charge transfer from monolayer TMD to chiral perovskite occurs within sub-picosecond timescales. Our results pave the way for practical valleytronics devices based on TMD/perovskite heterostructures.

Conference Presentation

Citation Download Citation

Shreetu Shrestha, Mingxing Li, and Mircea Cotlet "Room temperature valley polarization in transition metal dichalcogenide/chiral perovskite heterostructures", Proc. SPIE PC12423, 2D Photonic Materials and Devices VI, (17 March 2023); https://doi.org/10.1117/12.2650947

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