ФТТ, 2008, том 50, выпуск 2

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A new spin-polaron technique to treat the triangular-lattice antiferromagnet

Z.N.Dong

Department of Physics, Shanghai Jiao Tong University,
Shanghai 200240, China
E-mail: zh\_dong@sjity.edu.cn

(Received March 15, 2007
In final form, May 15 2007)

By expressing the Holstein-Primakoff transformation in a symmetric form a new spin-polaron technique for treating the triangular-lattice antiferromagnet is developed. With the technique, we have treated an extended t-J model, calculated the quasiparticle dispersion, and compared the dispersion with that obtained by other method.

PACS: 74.20.-z, 71.27.+a, 75.30.Gw

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