Thermodynamic properties of a two-dimensional electron gas with attractive interactions

J. O. Sofo, C. A. Balseiro

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We present a calculation of the thermodynamic properties of a two-dimensional negative-U Hubbard model in the low-density limit. We show that the standard expansion of the thermodynamic potential in terms of particle-particle ladder diagrams evaluated in the undressed fermion propagator, leads to unphysical results like negative entropy and/or specific heat. We propose a phenomenological pair susceptibility that avoids these problems and calculate the entropy and specific heat for different values of the parameters.

Original languageEnglish (US)
Pages (from-to)8197-8200
Number of pages4
JournalPhysical Review B
Volume45
Issue number14
DOIs
StatePublished - Jan 1 1992

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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