Geodesic
Graded spin-wave theory of $t-J$ model
Teoretičeskaâ i matematičeskaâ fizika, Tome 92 (1992) no. 3, pp. 415-424 
N. I. Karchev. Graded spin-wave theory of $t-J$ model. Teoretičeskaâ i matematičeskaâ fizika, Tome 92 (1992) no. 3, pp. 415-424. http://geodesic.mathdoc.fr/item/TMF_1992_92_3_a4/
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     title = {Graded spin-wave theory of $t-J$ model},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1992_92_3_a4/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A graded Holstein–Primakoff realization of the SU(2/1) algebra is proposed. A spin-wave theory with a condition that the sublattice magnetization is zero is discussed. A long-range spiral (incommensurate) phase is obtained at small doping and at $T=0$. The spin-spin correlator is calculated.

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