Effects of density imbalance on the BCS-BEC crossover in semiconductor electron-hole bilayers

Details Effects of density imbalance on the BCS-BEC crossover in semiconductor electron-hole bilayers Effects of density imbalance on the BCS-BEC crossover in semiconductor electron-hole bilayers

2006-10-11

arxiv.org/abs/cond-mat/0610311v1

Phys. Rev. B 75, 113301 (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.75.113301

We study the occurrence of excitonic superfluidity in electron-hole bilayers at zero temperature. We not only identify the crossover in the phase diagram from the BCS limit of overlapping pairs to the BEC limit of non-overlapping tightly-bound pairs but also, by varying the electron and hole densities independently, we can analyze a number of phases that occur mainly in the crossover region. With different electron and hole effective masses, the phase diagram is asymmetric with respect to excess electron or hole densities. We propose as the criterion for the onset of superfluidity, the jump of the electron and hole chemical potentials when their densities cross.

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