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Quantum correlations in quenched disordered spin models: Enhanced order from disorder by thermal fluctuations
Debasis Sadhukhan1, R Prabhu1, Aditi Sen De1
1Harish-Chandra Research Institute, Chhatnag Road, Jhunsi, Allahabad 211 019, India.
Abstract:
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.
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