Renormalized SO(5) symmetry in ladders with next-nearest-neighbor hopping

被引：25

作者：

Arrigoni, E ^{[1
]}

Hanke, W ^{[1
]}

机构：

[1] Univ Wurzburg, Inst Theoret Phys, D-97074 Wurzburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.82.2115

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the occurrence of SO(5) symmetry in the low-energy sector of two-chain Hubbard-like systems by analyzing the how of the running couplings (g-ology) under renormalization group in the weak-interaction limit. It is shown that SO(5) is asymptotically restored for low energies for rather general parameters of the bare Hamiltonian. This holds also with the inclusion of a next-nearest-neighbor hopping which explicitly breaks particle-hole symmetry if one accounts for a different single-particle weight for the quasiparticles of the two bands of the system. The physical significance of this renormalization SO(5) symmetry is discussed.

引用

页码：2115 / 2118

页数：4

共 13 条

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