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arXiv:1108.2285

Quantum correlations in the thermodynamic limit: the XY-model

Josep Amengual i Batle, Angel Ricardo Plastino, Angel Ricardo Plastino, M. Casas

Published Aug 10, 2011• 0 citations
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Abstract

We investigate thermal properties of quantum correlations in the thermodynamic limit with reference to the XY-model
DOI
10.48550/arxiv.1108.2285

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We investigate the behavior of quantum correlations of paradigmatic quenched disordered quantum spin models, viz., the XY spin glass and random-field XY models. We show that quenched averaged quantum correlations can exhibit the order-from-disorder phenomenon for finite-size systems as well as in the thermodynamic limit. Moreover, we find that the order-from-disorder can become more pronounced in the presence of temperature by suitable tuning of the system parameters. The effects are found for entanglement measures as well as for information-theoretic quantum correlation ones, although the former show them more prominently. We also observe that the equivalence between the quenched averages and their self-averaged cousins--for classical and quantum correlations--is related to the quantum critical point in the corresponding ordered system.