Phase diagram of the spin-Peierls chain with local coupling: Density-matrix renormalization-group calculations and unitary transformations

Alexander Weiße, Georg Hager, Alan R. Bishop, and Holger Fehske
Phys. Rev. B 74, 214426 – Published 27 December 2006

Abstract

We explore the ground-state phase diagram of a Heisenberg spin chain coupled locally to optical phonons (bond coupling), using large-scale density-matrix renormalization-group calculations and extending a unitary transformation approach which removes the spin-phonon coupling in leading order. For the quantum phase transition from the spin liquid to the dimerized phase, we find deviations from previous quantum Monte Carlo and flow equation results.

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  • Received 7 July 2006

DOI:https://doi.org/10.1103/PhysRevB.74.214426

©2006 American Physical Society

Authors & Affiliations

Alexander Weiße1, Georg Hager2, Alan R. Bishop3, and Holger Fehske1

  • 1Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, Domstraße 10a, 17487 Greifswald, Germany
  • 2Regionales Rechenzentrum Erlangen, HPC Services, Martensstraße 1, 91058 Erlangen, Germany
  • 3Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 74, Iss. 21 — 1 December 2006

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