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

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

1999-09-28

arxiv.org/abs/cond-mat/9909394v2

Physics

Condensed Matter

Strongly Correlated Electrons

22 pages, no figures

Scientific paper

10.1103/PhysRevB.61.6765

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<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<

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