Large exciton binding energy in a bulk van der Waals magnet from quasi-1D electronic localization.

ABSTRACT: Excitons, bound electron-hole pairs, influence the optical properties in strongly interacting solid-state systems and are typically most stable and pronounced in monolayer materials. Bulk systems with large exciton binding energies, on the other hand, are rare and the mechanisms driving their stability are still relatively unexplored. Here, we report an exceptionally large exciton binding energy in single crystals of the bulk van der Waals antiferromagnet CrSBr. Utilizing state-of-the-art angle-resolved photoemission spectroscopy and self-consistent ab-initio GW calculations, we present direct spectroscopic evidence supporting electronic localization and weak dielectric screening as mechanisms contributing to the amplified exciton binding energy. Furthermore, we report that surface doping

SUBMITTER: Smolenski S 

PROVIDER: S-EPMC11779854 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature