Twist-angle in moiré lattice controls valley polarization switching in heterostructures

https://phys.org/news/2024-05-angle-moir-lattice-valley-polarization.html

"dichalcogenide heterobilayer exciton valley polarization electrically controlled adjusting twist angle... less interlayer excitonic potential at local minima enhances degree of circular polarization... increased large angle intralayer electron-hole exchange reduces interlayer valley polarization... excitonic potential difference between 2 minima increases with twist angle, leading to higher external bias for devices with larger twist angle switching polarization... valley-addressable encoding devices (non-volatile computer memory)"