Tunable orbital thermoelectric transport with spin-valley coupling in a monolayer of ferromagnetic transition metal dichalcogenides
Abstract
Two dimensional (2D) materials with anisotropic optoelectronic properties provide a feasible solution for polarization photodetectors, however, it is challenging to achieve simultaneous high responsivity, fast photoresponse, and good anisotropic ratio of the photocurrent (Iph-max/Iph-min). In this work, a polarization-sensitive photodetector based on ReS2/MoSe2 van der Waals heterostructures is constructed for type-II energy band alignment with a clean contact interface. Under 532 nm laser irradiation, the photodetector has both high responsivity (89.4 A W−1), high-speed response (≈30.5 µs/≈36.2 µs), and high anisotropy ratio of 3.23. The performance of the device has been enhanced for multifunctional applications, including single-pixel polarization imaging and encrypted optical communication by combining Morse code with polarization encoding, demonstrating its potential in polarization-related optical information applications.
