Quantum lattice fluctuations in a frustrated Heisenberg spin-Peierls chain

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dc.creatorWeisse, A.
dc.creatorWellein, G.
dc.creatorFehske, H.
dc.date1999-01-25
dc.date.accessioned2026-07-07T03:12:41Z
dc.date.available2026-07-07T03:12:41Z
dc.descriptionAs a simple model for spin-Peierls systems we study a frustrated Heisenberg chain coupled to optical phonons. In view of the anorganic spin-Peierls compound CuGeO3 we consider two different mechanisms of spin-phonon coupling. Combining variational concepts in the adiabatic regime and perturbation theory in the anti-adiabatic regime we derive effective spin Hamiltonians which cover the dynamical effect of phonons in an approximate way. Ground-state phase diagrams of these models are determined, and the effect of frustration is discussed. Comparing the properties of the ground state and of low-lying excitations with exact diagonalization data for the full quantum spin phonon models, good agreement is found especially in the anti-adiabatic regime.
dc.description9 pages, 7 figures included, submitted to Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/9901262
dc.identifierhttp://arxiv.org/abs/cond-mat/9901262
dc.identifierPhys. Rev. B 60, 6566 (1999)
dc.identifierdoi:10.1103/PhysRevB.60.6566
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/29006
dc.subjectStrongly Correlated Electrons
dc.titleQuantum lattice fluctuations in a frustrated Heisenberg spin-Peierls chain
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