SYSTEMATIC 1/S STUDY OF THE 2-DIMENSIONAL HUBBARD-MODEL AT HALF-FILLING

被引：19

作者：

CHUBUKOV, AV ^{[1
]}

MUSAELIAN, KA ^{[1
]}

机构：

[1] PL KAPITZA PHYS PROBLEMS INST, MOSCOW 117334, RUSSIA

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.50.6238

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The two-dimensional Hubbard model is extended by placing 2S orbitals at each lattice site and studied in a systematic 1/S expansion. The 1/S results for the magnetic susceptibilitity and the spectra of spin-wave excitations at half-filling are consistent with the large S calculations for the Heisenberg antiferromagnet. The 1/S corrections to the fermionic spectrum lift the degeneracy along the edge of the magnetic Brillouin zone yielding minima at (+/- pi/2, +/- pi/2). Relation to previous papers on the subject is discussed.

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页码：6238 / 6245

页数：8

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