The phase diagram of the massive Gross-Neveu model, revisited

Abstract

The massive Gross-Neveu model is solved in the large N limit at finite temperature and chemical potential. The phase diagram features a kink-antikink crystal phase which was missed in previous works. Translated into the framework of condensed matter physics our results generalize the bipolaron lattice in non-degenerate conducting polymers to finite temperature.

Comments: revtex, 4 pages, 3 figures; v2: minor typos corrected; v3: minor corrections concerning figures 2 and 3