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

Abstract

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.

4 pages REVTEX and 4 Postscript figures

References in corpus (2)

• NaV_2O_5 as a quarter-filled ladder compound
• Non-Haldane Spin Liquid Models with Exact Ground States

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