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Spin-charge-density wave in a rounded-square Fermi surface for ultracold atoms

TitleSpin-charge-density wave in a rounded-square Fermi surface for ultracold atoms
Publication TypeJournal Article
Year of Publication2012
AuthorsD. Makogon, I. B. Spielman, and C. Morais Smith
JournalEPL
Volume97
Pagination33002
Date Publishedfeb
ISSN0295-5075
Keywords2012, Single Fellow
Abstract

We derive and discuss an experimentally realistic model describing ultracold atoms in an optical lattice including a commensurate, but staggered, spin-flip term. The resulting band structure is quite exotic; fermions in the third band have an unusual rounded picture-frame Fermi surface (essentially two concentric squircles), leading to imperfect nesting. We develop a generalized theory describing the spin and charge degrees of freedom simultaneously at the random-field-approximation level, and show that the system can develop a coupled spin-charge-density wave order. Our generic approach can be used to study spin and charge instabilities in many materials, such as high- T c superconductors, organic compounds, graphene, and iron pnictides.

URLhttp://stacks.iop.org/0295-5075/97/i=3/a=33002