期刊
ANNALEN DER PHYSIK
卷 529, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/andp.201600298
关键词
Disorder; spin transport; many-body localization
资金
- Slovenian Research Agency [J1-7279]
- European Research Council under the European Union [319286 Q-MAC]
- EPSRC National Quantum Technology Hub in Networked Quantum Information Processing (NQIT) [EP/M013243/1]
- Facultad de Ciencias at UniAndes
- EPSRC [EP/M013243/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M013243/1] Funding Source: researchfish
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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