Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Correlated Electrons: Poster Session

TT 78.6: Poster

Donnerstag, 10. März 2016, 15:00–18:30, Poster D

Quantum criticality gains long-time quantum correlations — •Rouhollah Jafari^1,2 and Alireza Akbari¹ — ¹Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 790-784, Korea — ²Department of Physics, University of Gothenburg, Sweden

Using the general quantum compass model as an environmental system, the dynamical evolution of the decoherence factors, quantum correlations, and negativity of the central spins has been investigated for different initial states. The relation between the quantum-classical transition of the central system, and the occurrence of an avoided level crossing quantum phase transition in its surrounding system has been analyzed. It is well known that the gapless quantum criticality enhances the decay of decoherence factors[1], while our calculations represent a different story for the gapped critical environment. The results that have been found show that long-time quantum correlations at the critical point are an effect of gapped criticality, and maximum decaying occurs away from the critical point[2].
H. T. Quanet al., PRL 96, 140604 (2006)
R. Jafari, and A. Akbari, EPL 111, 10007 (2015)