Randomness-driven quantum phase transition in bond-alternating Haldane chain

Details Randomness-driven quantum phase transition in bond-alternating Haldane chain Randomness-driven quantum phase transition in bond-alternating Haldane chain

2004-10-29

arxiv.org/abs/cond-mat/0410755v2

J. Phys. Soc. Jpn. 74, 1127 (2005)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 5 figures; minor changes; accepted for publication in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.74.1127

The effect of bond randomness on the spin-gapped ground state of the spin-1 bond-alternating antiferromagnetic Heisenberg chain is discussed. By using the loop cluster quantum Monte Carlo method, we investigate the stability of topological order in terms of the recently proposed twist order parameter [M. Nakamura and S. Todo: Phys. Rev. Lett. 89 (2002) 077204]. It is observed that the dimer phases as well as the Haldane phase of the spin-1 Heisenberg chain are robust against a weak randomness, though the valence-bond-solid-like topological order in the latter phase is destroyed by introducing a disorder stronger than the critical value.

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