Ground State and Excitations of Spin Chain with Orbital Degeneracy

Details Ground State and Excitations of Spin Chain with Orbital Degeneracy Ground State and Excitations of Spin Chain with Orbital Degeneracy

1999-02-19

arxiv.org/abs/cond-mat/9902269v3

Phys.Rev.B60:12781-12787,1999

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex, 9 pages, 3 figures; typos corrected

Scientific paper

10.1103/PhysRevB.60.12781

The one dimensional Heisenberg model in the presence of orbital degeneracy is studied at the SU(4) symmetric viewpoint by means of Bethe ansatz. Following Sutherland's previous work on an equivalent model, we discuss the ground state and the low-lying excitations more extensively in connection to the spin systems with orbital degeneracy. We show explicitly that the ground state is a SU(4) singlet. We study the degeneracies of the elementary excitations and the spectra of the generalized magnons consisting of these excitations. We also discuss the complex 2-strings in the context of the Bethe ansatz solutions.

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