RANDOM-PHASE-APPROXIMATION APPROACH TO COLLECTIVE MODES AROUND INHOMOGENEOUS HARTREE-FOCK STATES - ONE-DIMENSIONAL DOPED HUBBARD-MODEL

被引：22

作者：

YONEMITSU, K

BATISTIC, I

BISHOP, AR

机构：

[1] Theoretical Division, Los Alamos National Laboratory, Los Alamos

来源：

PHYSICAL REVIEW B | 1991年 / 44卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.44.2652

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

All the linear excitations are calculated in the random-phase approximation around a doped inhomogeneous Hartree-Fock state as well as the undoped uniform antiferromagnetic state in the one-dimensional Hubbard model. Upon doping, shape modes appear, localized around an introduced hole, as well as some "shake-off" branches related to combinations of local and extended Hartree-Fock orbitals. These modes are in addition to spin wave and ultragap branches in the pure antiferromagnetic state. Some characteristics of the shape modes are similar to bare processes in the t-t'-J model derived from the Hubbard model at strong coupling. Spectral weights in different susceptibility channels are calculated and shown to have peaks in low-energy regions, arising from specific shape modes.

引用

页码：2652 / 2663

页数：12

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