Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2010-10-31
Europhys. Lett. 93, 30004 (2011)
Physics
Condensed Matter
Statistical Mechanics
5 pages, 3 figures; published version
Scientific paper
10.1209/0295-5075/93/30004
We show that a broad class of quantum critical points can be stable against locally correlated disorder even if they are unstable against uncorrelated disorder. Although this result seemingly contradicts the Harris criterion, it follows naturally from the absence of a random-mass term in the associated order-parameter field theory. We illustrate the general concept with explicit calculations for quantum spin-chain models. Instead of the infinite-randomness physics induced by uncorrelated disorder, we find that weak locally correlated disorder is irrelevant. For larger disorder, we find a line of critical points with unusual properties such as an increase of the entanglement entropy with the disorder strength. We also propose experimental realizations in the context of quantum magnetism and cold-atom physics.
Hoyos Jose A.
Laflorencie Nicolas
Vieira André P.
Vojta Thomas
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