Absence of hole confinement in transition-metal oxides with orbital degeneracy

被引：59

作者：

Daghofer, Maria ^{[1
]}

Wohlfeld, Krzysztof ^{[1
,2
]}

Oles, Andrzej M. ^{[1
,2
]}

Arrigoni, Enrico ^{[3
]}

Horsch, Peter ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Jagiellonian Univ, Marian Smoluchowski Inst Phys, PL-30059 Krakow, Poland

[3] Graz Univ Technol, Inst Theoret & Computat Phys, A-8010 Graz, Austria

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.100.066403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the spectral properties of a hole moving in a two-dimensional Hubbard model for strongly correlated t(2g) electrons. Although superexchange interactions are Ising-like, a quasi-one-dimensional coherent hole motion arises due to effective three-site terms. This mechanism is fundamentally different from the hole motion via quantum fluctuations in the conventional spin model with SU(2) symmetry. The orbital model describes also propagation of a hole in some e(g) compounds, and we argue that orbital degeneracy alone does not lead to hole self-localization.

引用

页数：4

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