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 April 30, 2024)
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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
Download Paper
Keywords
charge density wave, exotic bands structure, Fermions, nesting, Optical lattice, spin density wave
Citation
Created January 20, 2012, Updated November 10, 2018