Elementary excitations of the symmetric spin-orbital model: The XY limit

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dc.creatorMila, F.
dc.creatorFrischmuth, B.
dc.creatorDeppeler, A.
dc.creatorTroyer, M.
dc.date1998-09-04
dc.date.accessioned2026-07-07T06:29:19Z
dc.date.available2026-07-07T06:29:19Z
dc.descriptionThe elementary excitations of the 1D, symmetric, spin-orbital model are investigated by studying two anisotropic versions of the model, the pure XY and the dimerized XXZ case, with analytical and numerical methods. While they preserve the symmetry between spin and orbital degrees of freedom, these models allow for a simple and transparent picture of the low--lying excitations: In the pure XY case, a phase separation takes place between two phases with free--fermion like, gapless excitations, while in the dimerized case, the low-energy effective Hamiltonian reduces to the 1D Ising model with gapped excitations. In both cases, all the elementary excitations involve simultaneous flips of the spin and orbital degrees of freedom, a clear indication of the breakdown of the traditional mean-field theory.
dc.descriptionRevtex, two figures
dc.identifierhttps://arxiv.org/abs/cond-mat/9809094
dc.identifierhttp://arxiv.org/abs/cond-mat/9809094
dc.identifierPhys. Rev. Lett. 82, 003697 (1999)
dc.identifierdoi:10.1103/PhysRevLett.82.3697
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97992
dc.subjectStrongly Correlated Electrons
dc.titleElementary excitations of the symmetric spin-orbital model: The XY limit
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