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Ground-state factorization and correlations with broken symmetry

Tomasello, Bruno, Rossini, D., Hamma, A., Amico, L. (2011) Ground-state factorization and correlations with broken symmetry. EPL (Europhysics Letters), 96 (2). Article Number 27002. ISSN 1286-4854. (doi:10.1209/0295-5075/96/27002) (KAR id:93234)

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We show how the phenomenon of factorization in a quantum many-body system is of collective nature. To this aim we study the quantum discord Q in the one-dimensional XY model in a transverse field. We analyze the behavior of Q at both the critical point and at the non-critical factorizing field. The factorization is found to be governed by an exponential scaling law for Q. We also address the thermal effects fanning out from the anomalies occurring at zero temperature. Close to the quantum phase transition, Q exhibits a finite-temperature crossover with universal scaling behavior, while the factorization phenomenon results in a non-trivial pattern of correlations present at low temperature.

Item Type: Article
DOI/Identification number: 10.1209/0295-5075/96/27002
Subjects: Q Science > QC Physics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Bruno Tomasello
Date Deposited: 21 Feb 2022 10:16 UTC
Last Modified: 24 Feb 2022 11:35 UTC
Resource URI: (The current URI for this page, for reference purposes)

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