Valley polarization in transition metal dichalcogenide via spin filtering

Shreetu Shrestha; Mingxing Li; Mircea Cotlet

doi:10.1117/12.2679909

5 October 2023 Valley polarization in transition metal dichalcogenide via spin filtering

Shreetu Shrestha, Mingxing Li, Mircea Cotlet

Author Affiliations +

Proceedings Volume PC12651, Low-Dimensional Materials and Devices 2023; PC126510H (2023) https://doi.org/10.1117/12.2679909
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

The two degenerate valleys, K and K’, in 2D transition metal dichalcogenides (TMD) can be used as information carriers for quantum information science and technologies. Obtaining valley polarization in TMDs, which is the equivalent of encoding or writing data, is the first step towards these applications. Here, we report valley polarization in monolayer TMD/chiral perovskite heterostructures at room temperature via spin selective charge transfer. We obtained 7% degree of polarization from the heterostructures after photoexcitation with a linearly polarized laser. We further demonstrate that charge transfer occurs within picoseconds using ultrafast transient absorption spectroscopy. 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 "Valley polarization in transition metal dichalcogenide via spin filtering", Proc. SPIE PC12651, Low-Dimensional Materials and Devices 2023, PC126510H (5 October 2023); https://doi.org/10.1117/12.2679909

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