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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session: Correlated Electrons 1

TT 17.46: Poster

Montag, 1. April 2019, 15:00–18:30, Poster D

Robustness of transport and localization effects in long-range coupled spin chains — •Manuel Katzer and Alexander Carmele — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

We study the transport properties of a disordered Heisenberg spin chain with long-range interaction [1] to shed light on excitation localization properties in the presence of gain and dissipation. The long-range coupled chain shows nearly ballistic transport and linear response for all potential differences of the external reservoirs. In contrast, the common isotropic nearest-neighbor coupling shows negative differential conductivity and a transition from diffusive to subdiffusive transport for a far-from-equilibrium driving. For the disordered long-range coupled XXZ chain, any change in the transport behavior is independent of the potential difference and the coupling strengths of the external reservoirs and provides a robust platform to study many-body localization properties. Furthermore, we investigate the transition from a spin chain to a network of coupled harmonic oscillators [2], with nonclassical saturation effects and emerging nonlinear behavior, leading to anomalous energy transport.
L. Droenner and A. Carmele Phys. Rev. B 96, 184421 (2017)
[2] J. Huber and P. Rabl, arXiv:1807.10189