Randomness-driven Quantum Phase Transition in Bond-alternating Haldane Chain(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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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.
- 社団法人日本物理学会の論文
- 2005-04-15
著者
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TAKAYAMA Hajime
Institute for Solid State Physics, University of Tokyo
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TODO Synge
Department of Applied Physics, University of Tokyo
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Takayama Hajime
Institute For Solid State Physics University Of Tokyo
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Todo Synge
Department Of Applied Physics University Of Tokyo:crest Japan Science And Technology Agency
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Synge Todo
Department Of Applied Physics University Of Tokyo
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ARAKAWA Takayuki
Institute for Solid State Physics, University of Tokyo
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Arakawa Takayuki
Institute For Solid State Physics University Of Tokyo:(present Address)speech Interface Technology G
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Takayama Hajime
Institute For Solid State Physics The University Of Tokyo
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