Classical dimers and dimerized superstructure in orbitally degenerate honeycomb antiferromagnet

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dc.creatorJackeli, G.
dc.creatorKhomskii, D. I.
dc.date2008-02-19
dc.date2008-03-18
dc.date.accessioned2026-07-07T09:31:40Z
dc.date.available2026-07-07T09:31:40Z
dc.descriptionWe discuss the ground state of the spin-orbital model for spin-one ions with partially filled $t_{2g}$ levels on a honeycomb lattice. We find that the orbital degrees of freedom induce a spontaneous dimerization of spins and drive them into nonmagnetic manifold spanned by hard-core dimer (spin-singlet) coverings of the lattice. The cooperative ``dimer Jahn-Teller'' effect is introduced through a magnetoelastic coupling and is shown to lift the orientational degeneracy of dimers leading to a peculiar valence bond crystal pattern. The present theory provides a theoretical explanation of nonmagnetic dimerized superstructure experimentally seen in Li$_2$RuO$_3$ compound at low temperatures.
dc.descriptionto appear in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/0802.2692
dc.identifierhttp://arxiv.org/abs/0802.2692
dc.identifierPhys. Rev. Lett. 100, 147203 (2008)
dc.identifierdoi:10.1103/PhysRevLett.100.147203
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/158540
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleClassical dimers and dimerized superstructure in orbitally degenerate honeycomb antiferromagnet
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