Geodesic
Graded spin-wave theory of $t-J$ model
Teoretičeskaâ i matematičeskaâ fizika, Tome 92 (1992) no. 3, pp. 415-424

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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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     author = {N. I. Karchev},
     title = {Graded spin-wave theory of $t-J$ model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {415--424},
     publisher = {mathdoc},
     volume = {92},
     number = {3},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TMF_1992_92_3_a4/}
}
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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/