Dark exciton valleytronics creation/ manipulation in atomically thin materials interact less with light/ heat, better preserving quantum information

https://www.oist.jp/news-center/news/2025/9/25/shining-light-dark-valleytronics

"2 types: momentum-dark/ spin-dark, mismatch prevents immediate recombination: enables more useful timescale/ making more isolated from environmental interactions... use either left- or right-circularly polarized light to selectively populate bright exciton in specific valley, then rapidly turning into numerous dark excitons potentially preserving valley information... classical/ quantum information technologies"