Spin-charge-density wave in a squircle-like Fermi surface for ultracold atoms

D. Makogon, I.B. Spielman, C. de Morais Smith

Research output: Contribution to journalArticleAcademicpeer-review


We derive and discuss an experimentally realistic model describing ultracold atoms in an optical lattice including a commensurate, but staggered, Zeeman field. 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 SO(3,1)xSO(3,1) theory describing the spin and charge degrees of freedom simultaneously, and show that the system can develop a coupled spin-charge-density wave order. This ordering is absent in studies of the Hubbard model that treat spin and charge density separately
Original languageEnglish
Article number33002
Pages (from-to)1-5
Number of pages5
JournalEurophysics Letters
Issue number3
Publication statusPublished - 2012


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