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

Preprint
Publisher Website
Google Scholar
  • 12 December 1997
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. We extend the analysis carried out by L. Balents et al. and include a next-nearest-neighbor hopping which explicitly breaks particle-hole symmetry. It is shown that SO(5) is restored in the scaling limit 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) is discussed.

This publication has 0 references indexed in Scilit: