Spin-orbital gapped phase with least symmetry breaking in the one-dimensional symmetrically coupled spin-orbital model

Abstract

To describe the spin-orbital energy gap formation in the one-dimensional symmetrically coupled spin-orbital model, we propose a simple mean field theory based on an SU(4) constraint fermion representation of spins and orbitals. A spin-orbital gapped phase is formed due to a marginally relevant spin-orbital valence bond pairing interaction. The energy gap of the spin and orbital excitations grows extremely slowly from the SU(4) symmetric point up to a maximum value and then decreases rapidly. By calculating the spin, orbital, and spin-orbital tensor static susceptibilities at zero temperature, we find a crossover from coherent to incoherent magnetic excitations as the spin-orbital coupling decreasing from large to small values.

10 pages, Revtex file, 5 figures

References in corpus (3)

• Ordered valence bond states in symmetric two-dimensional spin-orbital systems
• Series study of the One-dimensional S-T Spin-Orbital Model
• Non linear sigma models and quantum spin systems

Cited by in corpus (4)

• Class of exactly solvable SO(n) symmetric spin chains with matrix product ground states
• Spin--orbital interaction for face-sharing octahedra: Realization of a highly symmetric SU(4) model
• Valence bond spin liquid state in two-dimensional frustrated spin-1/2 Heisenberg antiferromagnets
• Simultaneous Charge Ordering and Spin Dimerization in Quasi-Two-Dimensional Quarter-Filled Ladders