Fermi surfaces and Luttinger's theorem in paired fermion systems

Details Fermi surfaces and Luttinger's theorem in paired fermion systems Fermi surfaces and Luttinger's theorem in paired fermion systems

2006-02-01

arxiv.org/abs/cond-mat/0602032v2

Phys.Rev. B73 (2006) 174504

Physics

Condensed Matter

Superconductivity

7 pages with one figure embedded. V2: Minor modifications. Final version as appeared in print

Scientific paper

10.1103/PhysRevB.73.174504

We discuss ground state properties of a mixture of two fermion species which can bind to form a molecular boson. When the densities of the fermions are unbalanced, one or more Fermi surfaces can appear: we describe the constraints placed by Luttinger's theorem on the volumes enclosed by these surfaces in such Bose-Fermi mixtures. We also discuss the nature of the quantum phase transitions involving changes in the number of Fermi surfaces.

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