Phys. Rev. Lett. 76, 839–842 (1996)Random Bonds and Topological Stability in Gapped Quantum Spin ChainsReceived 22 May 1995; published in the issue dated 29 January 1996 Using an asymptotically exact real space renormalization procedure, we find that the dimerized spin-1/2 chain is extremely stable against bond randomness. For weak dimerization or, equivalently, strong randomness, it is in a Griffiths phase with short-range spin-spin correlations and a divergent susceptibility. The string topological order persists. We conjecture that random integer spin chains in the Haldane phase exhibit similar thermodynamic and topological properties. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.839
DOI:
10.1103/PhysRevLett.76.839
PACS:
75.10.Jm, 75.30.Hx, 75.50.Ee
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