Orbital ordering and frustration of $p$-band Mott-insulators

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dc.creatorWu, Congjun
dc.date2008-01-06
dc.date2008-04-30
dc.date.accessioned2026-07-07T09:42:46Z
dc.date.available2026-07-07T09:42:46Z
dc.descriptionWe investigate the general structure of orbital exchange physics in Mott-insulating states of $p$-orbital systems in optical lattices. Orbital orders occur in both the triangular and Kagome lattices. In contrast, orbital exchange in the honeycomb lattice is frustrated as described by a novel quantum 120$^\circ$-model. Its classical ground states are mapped into configurations of the fully-packed loop model with an extra U(1) rotation degree of freedom. Quantum orbital fluctuations select a six-site plaquette ground state ordering pattern in the semiclassical limit from the ``order from disorder'' mechanism. This effect arises from the appearance of a zero energy flat-band of orbital excitations.
dc.descriptionaccepted by Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/0801.0888
dc.identifierhttp://arxiv.org/abs/0801.0888
dc.identifierPhys. Rev. Lett. 100, 200406 (2008)
dc.identifierdoi:10.1103/PhysRevLett.100.200406
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/162302
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleOrbital ordering and frustration of $p$-band Mott-insulators
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