Spielman, I.
, Makogon, D.
and de, C.
(2012),
Spin-Charge-Density Wave in a Squircle-Like Fermi Surface for Ultracold Atoms, Physical Review Letters, [online], https://doi.org/10.1209/0295-5075/97/33002
(Accessed October 1, 2025)
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Spin-Charge-Density Wave in a Squircle-Like Fermi Surface for Ultracold Atoms
Published
Author(s)
, Dima Makogon, Christiane de Morais Smith
Abstract
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) x SO(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.Citation
Physical Review Letters
Pub Type
Journals
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Keywords
charge density wave, exotic bands structure, Fermions, nesting, Optical lattice, spin density wave
Citation
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Created January 20, 2012, Updated November 10, 2018