Researchers demonstrate electrical control over exciton transport and valley polarisation in a perovskite-WS₂ heterostructure

Natural valleys, rice fields (Courtesy: Shutterstock/Jimmy Tran)

Information can be transported using electrons, for example in conventional computing, or using light in photonic devices. A third option that researchers are exploring is the use of excitons, which are bound electron-hole pairs created when a material is excited by light. Excitons can be thought of as an intermediate state between light and electrical charge carriers. However, excitons typically recombine quickly and emit light or undergo non-radiative recombination, limiting how far they can travel.…