Dynamics and asymptotics of correlations in a many-body localized system
1 Centre for Theoretical Atomic, Molecular and Optical Physics, Queen’s University Belfast, Belfast BT7 1NN, UK
2 Istituto Nazionale di Fisica Nucleare, Sezione di Milano, & Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, 20133 Milan, Italy
Received: 3 May 2017
Received in final form: 9 June 2017
Published online: 3 August 2017
We examine the dynamics of nearest-neighbor bipartite concurrence and total correlations in the spin-1/2 XXZ model with random fields. We show, starting from factorized random initial states, that the concurrence can suffer entanglement sudden death in the long time limit and therefore may not be a useful indicator of the properties of the system. In contrast, we show that the total correlations capture the dynamics more succinctly, and further reveal a fundamental difference in the dynamics governed by the ergodic versus many-body localized phases, with the latter exhibiting dynamical oscillations. Finally, we consider an initial state composed of several singlet pairs and show that by fixing the correlation properties, while the dynamics do not reveal noticeable differences between the phases, the long-time values of the correlation measures appear to indicate the critical region.
Key words: Quantum Optics
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