Room temperature valley polarization via spin selective charge transfer

Shreetu Shrestha (), Mingxing Li, Suji Park, Xiao Tong, Donald DiMarzio and Mircea Cotlet ()
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Shreetu Shrestha: Brookhaven National Laboratory
Mingxing Li: Brookhaven National Laboratory
Suji Park: Brookhaven National Laboratory
Xiao Tong: Brookhaven National Laboratory
Donald DiMarzio: Northrop Grumman Corporation, One Space Park
Mircea Cotlet: Brookhaven National Laboratory

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: 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 MoS2 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 MoS2/right-handed (R-(+)-) and left-handed (S-(-)-) 1-(1-naphthyl)ethylammonium lead iodide perovskite, respectively. We attribute this to spin selective charge transfer from MoS2 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.

Date: 2023
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DOI: 10.1038/s41467-023-40967-7

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