Geodesic
Three-dimensional Gross--Neveu model at nonzero temperature and in an external magnetic field
Teoretičeskaâ i matematičeskaâ fizika, Tome 90 (1992) no. 1, pp. 3-11

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The phase structure of the $(2+1)$ Gross–Neveu model at nonzero temperature $T$ and in an external field $H$ is studied in the leading order of the $1/N$ expansion. It is shown that for any fixed value of $T$ there exists a critical value $H_c$ of the magnetic field such that when $H>H_c$ the chiral invariance of the model is spontaneously broken. For fixed $H$, there exists a critical value of the temperature $T_c(H)$ such that for $T>T_c(H)$ the original symmetry of the model is restored. The phase portrait of the model is constructed in the $H-T$ plane. 
@article{TMF_1992_90_1_a0,
     author = {K. G. Klimenko},
     title = {Three-dimensional {Gross--Neveu} model at nonzero temperature and in an external magnetic field},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {3--11},
     publisher = {mathdoc},
     volume = {90},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1992_90_1_a0/}
}
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K. G. Klimenko. Three-dimensional Gross--Neveu model at nonzero temperature and in an external magnetic field. Teoretičeskaâ i matematičeskaâ fizika, Tome 90 (1992) no. 1, pp. 3-11. http://geodesic.mathdoc.fr/item/TMF_1992_90_1_a0/