Issue |
EPL
Volume 97, Number 3, February 2012
|
|
---|---|---|
Article Number | 33002 | |
Number of page(s) | 5 | |
Section | Atomic, Molecular and Optical Physics | |
DOI | https://doi.org/10.1209/0295-5075/97/33002 | |
Published online | 20 January 2012 |
Spin-charge-density wave in a rounded-square Fermi surface for ultracold atoms
1
Institute for Theoretical Physics Utrecht University - 3508 TD Utrecht, The Netherlands, EU
2
Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland Gaithersburg, MD, 20899, USA
Received:
16
December
2011
Accepted:
5
January
2012
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-Tc superconductors, organic compounds, graphene, and iron pnictides.
PACS: 37.10.Jk – Atoms in optical lattices / 03.75.Ss – Degenerate Fermi gases / 67.85.-d – Ultracold gases, trapped gases
© EPLA, 2012
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