On the ground state and excitations of a four-component fermion model

Abstract

The properties of the ground state and excitations of a four-component Hubbard-like model are studied by the Lieb-Schultz-Mattis approach. It is proven rigorously that the ground state of the model is nondegenerate and excitations are gapless at all band fillings.

arXiv commentRevtex, 4 pages, no figure

References in corpus (7)

• SU(4) Theory for Spin Systems with Orbital Degeneracy
• Non-perturbative approach to Luttinger's theorem in one dimension
• Alternating Spin and Orbital Dimerization in Strong-coupling Two-band Models
• SU(4) spin-orbit critical state in one dimension
• Phase diagram of a 1 dimensional spin-orbital model
• Numerical Study of the One-Dimensional Spin-Orbit Coupled System with SU(2)$\otimes$SU(2) Symmetry
• Effect of symmetry breaking perturbations in the one-dimensional SU(4) spin-orbital model

Cited by in corpus (3)

• Ordering of Energy Levels for Extended SU(N) Hubbard Chain
• Lowest-energy states in parity-transformation eigenspaces of SO(N) spin chain
• Lowest energy states of an $O(N)$ fermionic chain