Supersolidity in electron-hole bilayers with a large density imbalance
Cavendish Laboratory - JJ Thomson Avenue, Cambridge, CB3 0HE, UK
2 Universidad Autónoma de Madrid - Madrid 28049, Spain
Accepted: 6 June 2011
We consider an electron-hole bilayer in the limit of extreme density imbalance, where a single particle in one layer interacts attractively with a Fermi liquid in the other parallel layer. Using an appropriate variational wave function for the dressed exciton, we provide strong evidence for the existence of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase in electron-hole bilayers with a large density imbalance. Furthermore, within this unusual limit of FFLO, we find that a dilute gas of minority particles forms excitons that condense into a two-dimensional “supersolid”.
PACS: 73.21.-b – Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems / 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 67.80.K- – Other supersolids
© EPLA, 2011