Strong Enhancement of Superconducting Correlation in a Two-Component Fermion Gas

Details Strong Enhancement of Superconducting Correlation in a Two-Component Fermion Gas Strong Enhancement of Superconducting Correlation in a Two-Component Fermion Gas

1999-02-05

arxiv.org/abs/cond-mat/9902079v4

J. Phys. Soc. Jpn. 68, 2194-2197 (1999)

Physics

Condensed Matter

Superconductivity

5 pages including 5 PostScript figures

Scientific paper

10.1143/JPSJ.68.2194

We study high-density electron-hole (e-h) systems with the electron density slightly larger than the hole density. We find a new superconducting phase, in which the excess electrons form Cooper pairs moving in an e-h BCS phase. The coexistence of the e-h and e-e orders is possible because e and h have opposite charges, whereas analogous phases are impossible in the case of two fermion species that have the same charge or are neutral. Most strikingly, the e-h order enhances the superconducting e-h order parameter by more than one order of magnitude as compared with that given by the BCS formula, for the same value of the effective e-e attractive potential \lambda^{ee}. This new phase should be observable in an e-h system created by photoexcitation in doped semiconductors at low temperatures.

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