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

P. Pieri; D. Neilson; G. C. Strinati

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

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摘要

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.

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来源
《Physical review, B. Condensed matter and materials physics》 |2007年第11期|113301.1-113301.4|共9页
作者
P. Pieri; D. Neilson; G. C. Strinati;
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作者单位

Dipartimento di Fisica, Universita di Camerino, I-62032 Camerino, Italy;

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原文格式 PDF
正文语种英语
中图分类固体物理学;
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multilayers; static properties of condensates; thermodynamical; statistical and structural properties; degenerate fermi gases;

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

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