Exotic spiraling electrons discovered by physicists

Phys.org  February 18, 2019 Excitons form when intense light shines on solids, kicking negatively charged electrons out of their spots and leaving behind positively charged holes. A team of researchers in the US (Rutgers University, University of Florida, North Carolina State University) has discovered chiral surface exciton on the surface of bismuth selenide. Chiral exiton consists of particles and anti-particles bound together and swirling around each other on the surface of solids. The electrons and holes resemble rapidly spinning tops. The electrons eventually “spiral” towards the holes, annihilating each other in less than a trillionth of a second while emitting […]

Scientists use excitons to take electronics into the future

Nanowerk   July 25, 2018 An international team of researchers (Switzerland, Japan) made excitonic devices made of MoS2–WSe2 van der Waals heterostructures encapsulated in hexagonal boron nitride that demonstrate electrically controlled transistor actions at room temperature. The long-lived nature of the interlayer excitons in the devices results in them diffusing over five micrometres. Within the device, they have demonstrated the ability to manipulate exciton dynamics by creating electrically reconfigurable confining and repulsive potentials for the exciton flux. The research shows that it will be possible to integrate optical transmission and electronic data-processing systems into the same device, which will reduce the […]