Speaker
Description
Electron-hole bilayers heterostructures have emerged as a fascinating platform for studying unique electronic and optical phenomena in condensed matter physics. By precisely manipulating the spatial separation between electrons and holes and the particle density in two adjacent layers, researchers can access a rich spectrum of interaction-driven effects and exotic many-body states. I will introduce the concept of bilayer heterostructures and highlighting how it is possible to explore novel quantum phases such as excitonic superfluidity, BCS-BEC crossover, Wigner crystal formation, supersolidity.
However, despite extensive experimental efforts, conclusive evidence of exciton superfluidity remains elusive due to challenges in traditional probing methods, partly because of the neutral nature of excitons.
In this regard, we investigate collective modes, Josephson effect and Berezinskii-Kosterlitz-Thouless transition to identify alternative fingerprints of exciton superfluidity.