2-LOOP SCATTERING-AMPLITUDES FOR THE FINITE-CHARGE INFINITE-U HUBBARD-MODEL - EXISTENCE OF A SPIN-EXCHANGE COLLECTIVE MODE

被引：4

作者：

RASUL, JW

机构：

[1] Department of Physics, University of Michigan, Ann Arbor

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.50.2133

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the spin-exchange scattering amplitude at two-loop (1/N2) order for the infinite-U Hubbard model away from the metal-insulator filling, with finite electron charge, for which a well-defined 1/N expansion is possible, the mean-field level being equivalent to Gutzwiller enhanced quasiparticles. We find a positive spin-exchange Landau parameter which suggests that the spin-density fluctuations show a well-defined collective mode near the metal-insulator filling. This behavior is interpreted as paralleling the spin and charge separation in the Luttinger liquid.

引用

页码：2133 / 2141

页数：9

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