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  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. (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.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0001-9787-C Version Permalink: https://hdl.handle.net/21.11116/0000-0004-BF3D-2
Genre: Journal Article

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 Creators:
Žnidarič, M.1, Author
Mendoza‐Arenas, J. J.2, 3, Author
Clark, S. R.4, 5, Author           
Goold, J.6, Author
Affiliations:
1Physics Department, Faculty of Mathematics and Physics, University of Ljubljana, ou_persistent22              
2Departamento de Física, Universidad de los Andes, ou_persistent22              
3Clarendon Laboratory, University of Oxford, ou_persistent22              
4Department of Physics, University of Bath, ou_persistent22              
5Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
6The Abdus Salam ICTP, ou_persistent22              

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Free keywords: Disorder; spin transport; many-body localization
 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.

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Language(s): eng - English
 Dates: 2016-11-142016-10-062016-11-152016-12-142017-07
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/andp.201600298
arXiv: 1609.09367
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Project name : M. ˇ Z acknowledges Grant No. J1-7279 from the Slovenian Research Agency. J.G. would like to thank V. Varma and A. Scardicchio for numerous discussions. The authors would like to acknowledge the use of the University of Oxford Ad- vanced Research Computing (ARC) facility in carrying out this work. http://dx.doi.org/10.5281/zenodo.22558. This research is par- tially funded by the European Research Council under the Euro- pean Union’s Seventh Framework Programme (FP7/2007-2013)/ERC Grant Agreement no. 319286 Q-MAC. This work was also sup- ported by the EPSRC National Quantum Technology Hub in Net- worked Quantum Information Processing (NQIT) EP/M013243/1. J.J.M.A. acknowledges nancial support from Facultad de Ciencias at UniAndes-2015 project “Quantum control of non-equilibrium hybrid systems-Part II”.
Grant ID : 319286
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)

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Title: Annalen der Physik
  Other : Ann. Phys.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 529 (7) Sequence Number: UNSP 1600298 Start / End Page: - Identifier: Other: 0003-3804
CoNE: https://pure.mpg.de/cone/journals/resource/954925379961