Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-10-07
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 5 figures, new references added
Scientific paper
10.1103/PhysRevB.61.6747
We study a 1 dimensional spin-orbital model using both analytical and numerical methods. Renormalization group calculations are performed in the vicinity of a special integrable point in the phase diagram with SU(4) symmetry. These indicate the existence of a gapless phase in an extended region of the phase diagram, missed in previous studies. This phase is SU(4) invariant at low energies apart from the presence of different velocities for spin and orbital degrees of freedom. The phase transition into a gapped dimerized phase is in a generalized Kosterlitz-Thouless universality class. The phase diagram of this model is sketched using the density matrix renormalization group technique.
Affleck Ian
Itoi Chigak
Qin Shaojin
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