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

Abstract

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.

Authors:
;  [1];  [1];  [2]
  1. Dipartimento di Fisica, Universita di Camerino, I-62032 Camerino (Italy)
  2. (Australia)
Publication Date:
OSTI Identifier:
20957774
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevB.75.113301; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Pieri, P., Strinati, G. C., Neilson, D., and School of Physics, University of New South Wales, Sydney 2052. Effects of density imbalance on the BCS-BEC crossover in semiconductor electron-hole bilayers. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.113301.
Pieri, P., Strinati, G. C., Neilson, D., & School of Physics, University of New South Wales, Sydney 2052. Effects of density imbalance on the BCS-BEC crossover in semiconductor electron-hole bilayers. United States. doi:10.1103/PHYSREVB.75.113301.
Pieri, P., Strinati, G. C., Neilson, D., and School of Physics, University of New South Wales, Sydney 2052. Thu . "Effects of density imbalance on the BCS-BEC crossover in semiconductor electron-hole bilayers". United States. doi:10.1103/PHYSREVB.75.113301.
@article{osti_20957774,
title = {Effects of density imbalance on the BCS-BEC crossover in semiconductor electron-hole bilayers},
author = {Pieri, P. and Strinati, G. C. and Neilson, D. and School of Physics, University of New South Wales, Sydney 2052},
abstractNote = {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.},
doi = {10.1103/PHYSREVB.75.113301},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 11,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}