EurekAlert August 17, 2020
An international team of researchers (UK, France, Italy) has spectroscopically observed bound electrons and holes, leading to the creation of an intraband bound exciton. The discrete resonance appears below the ionization threshold only when the coupling between light and matter is increased above a critical value. The result demonstrates that two charged particles can be bound by the exchange of transverse photons. Light–matter coupling can thus be used as a tool in quantum material engineering, tuning electronic properties of semiconductor heterostructures beyond those permitted by mere crystal structures, with direct applications to mid-infrared optoelectronics…read more. TECHNICAL ARTICLE
Schematic of the experimental setup. Credit: University of Southampton