Dephasing enhanced spin transport in the ergodic phase of a many‐body 
localizable system

Žnidarič, M.; Mendoza‐Arenas, J. J.; Clark, S. R.; Goold, J.

doi:10.1002/andp.201600298

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Journal Article

Dephasing enhanced spin transport in the ergodic phase of a many‐body localizable system

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Clark, S. R.
Department of Physics, University of Bath;
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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https://dx.doi.org/10.1002/andp.201600298
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https://arxiv.org/abs/1609.09367
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1609.09367.pdf
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Citation

Žnidarič, M., Mendoza‐Arenas, J. J., Clark, S. R., & Goold, J. (2017). Dephasing enhanced spin transport in the ergodic phase of a many‐body localizable system. Annalen der Physik, 529(7): UNSP 1600298. doi:10.1002/andp.201600298.

Cite as: https://hdl.handle.net/21.11116/0000-0001-9787-C

Abstract

We study high temperature spin transport in a disordered Heisenberg chain in the ergodic regime when bulk dephasing is present. We find that while dephasing always renders the transport diffusive, there is nonetheless a remnant of the diffusive to sub‐diffusive transition found in a system without dephasing manifested in the behaviour of the diffusion constant with the dephasing strength. By studying finite‐size effects we show numerically and theoretically that this feature is caused by the competition between large crossover length scales associated to disorder and dephasing that control the dynamics observed in the thermodynamic limit. We demonstrate that this competition may lead to a dephasing enhanced transport in this model.