The spin-Peierls chain revisited

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:310

Article; Proceedings Paper

Hager, Georg ; Weisse, Alexander ; Wellein, Gerhard ; Jeckelmann, Eric ; Fehske, Holger

关键词: magnetoelastic coupling;    spin-peierls transition;    DMRG;   

DOI  :  10.1016/j.jmmm.2006.10.399

来源: Elsevier

【 摘 要 】

We extend previous analytical studies of the ground-state phase diagram of a one-dimensional Heisenberg spin chain coupled to optical phonons, which for increasing spin-lattice coupling undergoes a quantum phase transition from a gapless to a gaped phase with finite lattice dimerisation. We check the analytical results against established four-block and new two-block density matrix renormalisation group (DMRG) calculations. Different finite-size scaling behaviour of the spin excitation gaps is found in the adiabatic and anti-adiabatic regimes. (c) 2006 Elsevier B.V. All rights reserved.

【 授权许可】

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