Room temperature valley polarization via spin selective charge transfer

Shrestha, Shreetu; Li, Mingxing; Park, Suji; Tong, Xiao; DiMarzio, Donald; Cotlet, Mircea

doi:10.1038/s41467-023-40967-7

Title: Room temperature valley polarization via spin selective charge transfer

Journal Article · 25 August 2023 · Nature Communications

DOI: https://doi.org/10.1038/s41467-023-40967-7 · OSTI ID:1996839

; Li, Mingxing; Park, Suji; Tong, Xiao;

;

Abstract The two degenerate valleys in transition metal dichalcogenides can be used to store and process information for quantum information science and technology. A major challenge is maintaining valley polarization at room temperature where phonon-induced intervalley scattering is prominent. Here we demonstrate room temperature valley polarization in heterostructures of monolayer MoS ₂ and naphthylethylammine based one-dimensional chiral lead halide perovskite. By optically exciting the heterostructures with linearly polarized light close to resonance and measuring the helicity resolved photoluminescence, we obtain a degree of polarization of up to −7% and 8% in MoS ₂ /right-handed (R-(+)-) and left-handed (S-(-)-) 1-(1-naphthyl)ethylammonium lead iodide perovskite, respectively. We attribute this to spin selective charge transfer from MoS ₂ to the chiral perovskites, where the perovskites act as a spin filter due to their chiral nature. Our study provides a simple, yet robust route to obtain room temperature valley polarization, paving the way for practical valleytronics devices.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0012704

OSTI ID:: 1996839

Report Number(s):: BNL--224925-2023-JAAM; 5234; PII: 40967

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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