Protecting clean critical points by local disorder correlations
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2011
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Resumo |
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. Copyright (C) EPLA, 2011 U.S. National Science Foundation (NSF) NSF[DMR-0339147] U.S. National Science Foundation (NSF) NSF[DMR-0906566] Research Corporation Research Corporation FAPESP Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) CNPq Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) |
Identificador |
EPL, v.93, n.3, 2011 0295-5075 http://producao.usp.br/handle/BDPI/29823 10.1209/0295-5075/93/30004 |
Idioma(s) |
eng |
Publicador |
EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY |
Relação |
Epl |
Direitos |
restrictedAccess Copyright EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY |
Palavras-Chave | #TRANSVERSE-FIELD #CONDUCTING POLYMERS #RANDOM IMPURITIES #CRITICAL-BEHAVIOR #ISING-MODEL #SYSTEMS #POLYANILINE #DEFECTS #QUANTUM #CHAINS #Physics, Multidisciplinary |
Tipo |
article original article publishedVersion |