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Title: Propagation of fluctuations in the quantum Ising model
Authors: Navez, P.
Tsironis, G.P.
Zagoskin, Alexandre M.
Issue Date: 2017
Publisher: © American Physical Society
Citation: NAVEZ, P., TSIRONIS, G.P. and ZAGOSKIN, A.M., 2017. Propagation of fluctuations in the quantum Ising model. Physical Review B, 95 (6), 7pp.
Abstract: We investigate entanglement dynamics and correlations in the quantum Ising model in arbitrary dimensions using a large-coordination-number expansion. We start from the pure paramagnetic regime obtained through zero spin-spin coupling and subsequently turn on the interspin interaction in a time-dependent fashion. We investigate analytically and compare results for both the slow adiabatic onset of the interactions and the fast instantaneous switching. We find that in the latter case of an initial excitation mode a quantum correlation wave spreads through the system, propagating with twice the group velocity of the linearized equilibrium modes. This wave establishes the spatiotemporal regime of entangled quantum properties of the system for time scales shorter than the decoherence time and thus provides an indicator for the "quantumness" of the physical system that the specific system models.
Description: This article was published in the journal Physical Review B [© American Physical Society] and the definitive version is available at: https://doi.org/10.1103/PhysRevB.95.064304
Sponsor: We acknowledge partial support from the European Union’s Seventh Framework Programme (FP7-REGPOT-2012-2013- 1) under Grant Agreement No. 316165, by EPSRC Grant No. EP/M006581/1, and by the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST MISiS (Grants No. K2- 2014-015 and No. K2-2015-007). Helpful discussions with J. Betouras, M. Qureshi, M. Lukovic, F. Queisser, K. Krutitsky, ´ and R. Schutzhold are also gratefully acknowledged.
Version: Accepted for publication
DOI: 10.1103/PhysRevB.95.064304
URI: https://dspace.lboro.ac.uk/2134/24570
Publisher Link: http://dx.doi.org/10.1103/PhysRevB.95.064304
ISSN: 1098-0121
Appears in Collections:Published Articles (Physics)

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