Gap formation and soft phonon mode in the Holstein model

被引：99

作者：

Meyer, D

Hewson, AC

Bulla, R

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Math, London SW7 2BZ, England

[2] Univ Augsburg, D-86135 Augsburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 19期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.89.196401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate electron-phonon coupling in many-electron systems using the dynamical mean-field theory in combination with the numerical renormalization group. This nonperturbative method reveals significant precursor effects to the gap formation at intermediate coupling strengths. The emergence of a soft phonon mode and very strong lattice fluctuations can be understood in terms of Kondo-like physics due to the development of a double-well structure in the effective potential for the ions.

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页码：1 / 196401

页数：4

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