Exactly solvable model for isospin S=3/2 fermionic atoms on an optical lattice

Abstract

We propose an exact solution of a model describing a low energy behavior of cold isospin S=3/2 fermionic atoms on a one-dimensional optical lattice. Depending on the band filling the effective field theory has a form of a deformed Gross-Neveu model with either $O(7)\times {\mathbb{Z}}_2$ (half filling) or $U(1)\times O(5)\times {\mathbb{Z}}_2$ symmetry.

4 pages, no figures, replaced with the final version to appear in PRL