Moire\nExciton Polaron Engineering via twisted\nhBN

Twisted hexagonal boron nitride (thBN) exhibits ferroelectricity\ndue to moiré superlattices with AB/BA domains. These domains\npossess electric dipoles, leading to a periodic electrostatic potential\nthat can be imprinted onto other materials placed in its proximity.\nHere we demonstrate the remote imprinting of moiré patterns\nfrom thBN onto monolayer MoSe<sub>2</sub> and investigate the changes\nin the exciton properties. We confirm the imprinted moiré patterns\non monolayer MoSe<sub>2</sub> using Kelvin probe force microscopy\n(KPFM) and hyperspectral photoluminescence (PL) mapping. By creating\na large ferroelectric domain (∼8.7 μm), we achieve unprecedented\npotential modulation (∼387 ± 52 meV). We observe the formation\nof exciton-polarons by the ferroelectric moiré domains and\ninvestigate the optical property changes induced by the moiré\npattern in monolayer MoSe<sub>2</sub> by varying the moiré\ndomain size down to ∼110 nm. Our findings highlight the potential\nof thBN as a platform for controlling the properties of 2D materials\nfor optoelectronic and valleytronic applications.