Stability of nodal quasiparticles in superconductors with coexisting orders

被引：48

作者：

Berg, E. ^{[1
]}

Chen, C-C. ^{[1
]}

Kivelson, S. A. ^{[1
]}

机构：

[1] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 02期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.100.027003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We establish a condition for the perturbative stability of zero energy nodal points in the quasiparticle spectrum of superconductors in the presence of coexisting commensurate orders. The nodes are found to be stable if the Hamiltonian is invariant under time reversal followed by a lattice translation. The principle is demonstrated with a few examples. Some experimental implications of various types of assumed order are discussed in the context of the cuprate superconductors.

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