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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.
Shreetu Shrestha,Mingxing Li, andMircea 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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Shreetu Shrestha, Mingxing Li, 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