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

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.75.113301· OSTI ID:20957774

Pieri, P; Strinati, G C ^[1]; Neilson, D ^[1]

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1. Dipartimento di Fisica, Universita di Camerino, I-62032 Camerino (Italy)

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 nonoverlapping 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.

• OSTI ID: 20957774
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 11 Vol. 75; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM COMPOUNDS
BCS THEORY
BOSE-EINSTEIN CONDENSATION
DENSITY
EFFECTIVE MASS
ELECTRON DENSITY
ELECTRONS
GALLIUM ARSENIDES
HOLES
LAYERS
PHASE DIAGRAMS
SEMICONDUCTOR MATERIALS
SUPERFLUIDITY