TRANSVERSE-SPIN CORRELATIONS AND SINGLE-MODE APPROXIMATION FOR THE SQUARE-LATTICE S = 1/2 HEISENBERG-MODEL

被引：17

作者：

SINGH, RRP

机构：

[1] Department of Physics, University of California, Davis

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.47.12337

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We calculate the equal-time transverse-spin correlations at zero temperature for the nearest-neighbor square-lattice spin-1/2 Heisenberg antiferromagnet by expansions around the Ising limit. To a good approximation, these correlations are proportional over the entire Brillouin zone, to the spin-wave result. If we use the single-mode approximation to estimate the spin-wave dispersion, we find linear gapless modes near both q=(0,0) and q=(pi,pi), with spin-wave velocity approximately 1.4 times the spin-wave answer of square-root 2J. This is larger than previous estimates of Z(c)=1.18+/-0.02, reflecting the mixing of higher magnons.

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页码：12337 / 12340

页数：4

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