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Title
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Cluster methods for the description of a driven-dissipative spin model
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Author
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Abstract
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| We study the influence of short-range quantum correlations and classical spatial correlations on the phase diagram of the dissipative XYZ model by using a Gutzwiller Monte Carlo method and a cluster Gutzwiller ansatz for the wave function. Considering lattices of finite size we confirm the emergence of a region with ferromagnetic correlations and two paramagnetic regions and show the emergence of a region with a buildup of ferromagnetic correlations completely missed by mean-field theory. The inclusion of short-range quantum correlations causes drastic alterations of the mean-field correlation functions but our results show that the inclusion of long-range quantum correlations or the use of more sophisticated methods is needed to quantitatively match the exact results. A study of the susceptibility tensor shows that reciprocity is broken, a feature not observed in closed quantum systems. Furthermore, increasing the magnetic field suppresses the magnetization; this is also in contrast with closed quantum systems. |
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Language
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English
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Source (journal)
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PHYSICAL REVIEW A
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Publication
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2019
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DOI
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10.1103/PHYSREVA.99.043841
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Volume/pages
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99
:4
(2019)
, 8 p.
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Article Reference
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043841
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ISI
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000466237600011
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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