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

Preprint

2 February 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9712143

Abstract

We study the occurrence of SO(5) symmetry in the low-energy sector of two-chain Hubbard-like systems by analyzing the flow 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 inclusion of a next-nearest-neighbor hopping which explicitly breaks particle-hole symmetry provided one accounts for a different single-particle weight for the quasiparticles of the two bands of the system. The physical significance of this renormalized SO(5) symmetry is discussed.

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All Related Versions

Version 1, 1997-12-12, ArXiv
Version 2, 1997-12-14, ArXiv
Version 3, 1999-02-02, ArXiv
Published version: Physical Review Letters, 82 (10), 2115.

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