0
views
0
recommends
+1 Recommend
0 collections
0
shares
• Record: found
• Abstract: found
• Article: found
Is Open Access

# Instability of subdiffusive spin dynamics in strongly disordered Hubbard chain

Preprint

Bookmark
There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

### Abstract

We study spin transport in a Hubbard chain with strong, random, on--site potential and with spin--dependent hopping integrals, $$t_{\sigma}$$. For the the SU(2) symmetric case, $$t_{\uparrow} =t_{\downarrow}$$, such model exhibits only partial many-body localization with localized charge and (delocalized) subdiffusive spin excitations. Here, we demonstrate that breaking the SU(2) symmetry by even weak spin--asymmetry, $$t_{\uparrow} \ne t_{\downarrow}$$, localizes spins and restores full many-body localization. To this end we derive an effective spin model, where the spin subdiffusion is shown to be destroyed by arbitrarily weak $$t_{\uparrow} \ne t_{\downarrow}$$. Instability of the spin subdiffusion originates from an interplay between random effective fields and singularly distributed random exchange interactions.

### Most cited references29

• Record: found

### Localization of interacting fermions at high temperature

(2007)
Bookmark
• Record: found

### Observation of many-body localization of interacting fermions in a quasirandom optical lattice

(2015)
Bookmark
• Record: found

### Phenomenology of fully many-body-localized systems

(2014)
Bookmark

### Author and article information

###### Journal
09 March 2019
1903.03770 10.1103/PhysRevB.99.121110