Low-temperature Lanczos method for strongly correlated systems

被引：56

作者：

Aichhorn, M ^{[1
]}

Daghofer, M ^{[1
]}

Evertz, HG ^{[1
]}

von der Linden, W ^{[1
]}

机构：

[1] Graz Tech Univ, Inst Theoret Phys, A-8010 Graz, Austria

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.67.161103

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a modified finite-temperature Lanczos method for the evaluation of dynamical and static quantities of strongly correlated electron systems that complements the finite-temperature method introduced by Jaklic and Prelovsek for low temperatures. Together they allow accurate calculations at any temperature with moderate effort. As an example we calculate the static spin-correlation function and the regular part of the optical conductivity sigma(reg)(omega) of the one-dimensional Hubbard model at half filling and show in detail the connection between the ground-state and finite-temperature method. By using cluster perturbation theory, the finite-temperature spectral function is extended to the infinite system, clearly exhibiting the effects of spin-charge separation.

引用

页数：4

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