Exciton in solids is one bound state formed by electron and hole attracting each other via Coulomb interaction. Charge neutrality and an expected itinerant nature makes excitons potential transmitters of information. Excitons are well studied in insulators or semiconductors with negligible velocity that limits its transport efficiency and application, as it’s thought that screening effect from free charges usually suppresses the formation of excitons in metal. Until very recently, we discovered robust excitons with large velocity in quasi-one-dimensional metal Titanium Triselenide, taking advantage of its low dimensionality and carrier density.
Read more at Nature Materials:
https://www.nature.com/articles/s41563-022-01201-9
The paper was featured in CityU Research Stories:
https://www.cityu.edu.hk/research/stories/2022/03/18/fast-moving-excitons-observed-first-time-metal-unlocking-potential-speed-digital-communication
21 Feb 2022