Doping a Mott insulator with orbital degrees of freedom

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dc.creatorSirker, J.
dc.creatorDamerau, J.
dc.creatorKlümper, A.
dc.date2008-09-19
dc.date.accessioned2026-07-07T12:27:01Z
dc.date.available2026-07-07T12:27:01Z
dc.descriptionWe study the effects of hole doping on one-dimensional Mott insulators with orbital degrees of freedom. We describe the system in terms of a generalized t-J model. At a specific point in parameter space the model becomes integrable in analogy to the one-band supersymmetric t-J model. We use the Bethe ansatz to derive a set of nonlinear integral equations which allow us to study the thermodynamics exactly. Moving away from this special point in parameter space we use the density-matrix renormalization group applied to transfer matrices to study the evolution of various phases of the undoped system with doping and temperature. Finally, we study a one-dimensional version of a realistic model for cubic titanates which includes the anisotropy of the orbital sector due to Hund's coupling. We find a transition from a phase with antiferromagnetically correlated spins to a phase where the spins are fully ferromagnetically polarized, a strong tendency towards phase separation at large Hund's coupling, as well as the possibility of an instability towards triplet superconductivity.
dc.identifierhttps://arxiv.org/abs/0809.3427
dc.identifierhttp://arxiv.org/abs/0809.3427
dc.identifierPhys. Rev. B 78, 235125 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.235125
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/215068
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleDoping a Mott insulator with orbital degrees of freedom
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