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

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.

Final version: to appear in Phys. Rev. Lett., sched. Mar. 99

References in corpus (6)

• Exact SO(8) Symmetry in the Weakly-Interacting Two-Leg Ladder
• An SO(5) Symmetric Ladder
• Microscopic Electron Models with Exact SO(5) Symmetry
• Exact realization of SO(5) symmetry in extended Hubbard models
• Finite-Size Studies on the SO(5) Symmetry of the Hubbard Model
• SO(5)-Symmetric Description of the Low Energy Sector of a Ladder System

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