Wigner supersolid of excitons in electron-hole bilayers

[摘要] Bilayer electron-hole systems, where carriers in one layer are electrons and carriers in the other are holes, have been actively investigated in recent years with the focus on Bose-Einstein condensation of excitons. This condensation is expected to occur when the layer separation d is much smaller than the interparticle distance r(s)a(B) within each layer. In this Brief Report, we argue for the existence of a state, Wigner supersolid, in which excitons are phase coherent but form a Wigner crystal due to dipolar repulsion. We present the qualitative phase diagram of a bilayer system and discuss properties and possible signatures of the Wigner supersolid phase.

[发布日期] 2006-12-01

[关键词] SPATIALLY SEPARATED ELECTRONS;BOSE-EINSTEIN CONDENSATION;PHASE-DIAGRAM;2-DIMENSIONAL ELECTRON;SYSTEMS;SUPERCONDUCTIVITY;TRANSPORT;MECHANISM;HELIUM;STATE