Phys.org July 9, 2019
An international team of researchers (USA – UC Riverside, National High Magnetic Field Laboratory, State University of Florida, Japan) has observed, characterized, and controlled dark trions in tungsten diselenide. Because a trion contains three interacting particles, controllable spin and momentum indices and a rich internal structure, it can carry much more information than a single electron. The lifetime of dark trions is more than 100 times longer than the more common bright trions. The long lifetime enables information transmission by trions over a much longer distance. They demonstrated continuous tuning from positive dark trions to negative dark trions by simply adjusting an external voltage. Their results could increase the capacity and alter the form of information transmission…read more. TECHNICAL ARTICLE
Image shows optical generation of trions in single-layer tungsten diselenide. Credit: Erfu Liu, UC Riverside.