Effects of a magnetic field on the one-dimensional spin-orbital model

Abstract

We study the effects of a uniform magnetic field on the one-dimensional spin-orbital model in terms of effective field theories. Two regions are examined: one around the SU(4) point (J=K/4) and the other with K<<J. We found that when $J\le K/4$, the spin and orbital correlation functions exhibit power-law decay with nonuniversal exponents. In the region with J>K/4, the excitation spectrum has a gap. When the magnetic field is beyond some critical value, a quantum phase transition occurs. However, the correlation functions around the SU(4) point and the region with K<<J exhibit distinct behavior. This results from different structures of excitation spectra in both regime.

22 pages, no figures

References in corpus (2)

• Phase diagram of a 1 dimensional spin-orbital model
• Crossover Phenomena in the One-Dimensional SU(4) Spin-Orbit Model under Magnetic Fields

Cited by in corpus (8)

• One-Dimensional Magnetism
• Low-energy behavior of the spin-tube and spin-orbital models
• Elementary excitations in one-dimensional spin-orbital models: neutral and charged solitons and their bound states
• Dynamical Properties of Spin-Orbital Chains in a Magnetic Field
• Magnetic properties of an SU(4) spin-orbital chain
• Symmetry breaking in low-dimensional SU(N) antiferromagnets
• Response functions in multicomponent Luttinger liquids
• Phase diagram and symmetry breaking of SU(4) spin-orbital chain in a generalized external field