Alternating Spin and Orbital Dimerization in Strong-coupling Two-band Models

Details Alternating Spin and Orbital Dimerization in Strong-coupling Two-band Models Alternating Spin and Orbital Dimerization in Strong-coupling Two-band Models

1998-07-20

arxiv.org/abs/cond-mat/9807270v1

Phys.Rev.Lett., 81 (1998) 5406

Physics

Condensed Matter

4 pages REVTEX and 4 Postscript figures

Scientific paper

10.1103/PhysRevLett.81.5406

We study a one-dimensional Hamiltonian consisting of coupled SU(2) spin and orbital degrees of freedom. Using the density matrix renormalization group, we calculate the phase-diagram and the ground state correlation functions for this model. We find that, in addition to the ferromagnetic and power-law antiferromagnetic phases for spin and orbital degrees of freedom, this model has a gapless line extending from the ferromagnetic phase to the Bethe ansatz solvable SU(4) critical point, and a gapped phase with doubly degenerate ground states which form alternating spin and orbital singlets. The spin-gap and the order parameters are evaluated and the relevance to several recently discovered spin-gap materials is discussed.

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