Many-body localization of bosons in optical lattices

doi:10.1088/1367-2630/aabb17

Many-body localization of bosons in optical lattices

Bibliographic description

title:	Many-body localization of bosons in optical lattices
author:	Sierant Piotr , Zakrzewski Jakub
Journal title:	New Journal of Physics
volume:	20
issue:	4
date of publication:	2018
article ID:	043032
eISSN:	1367-2630
DOI:	10.1088/1367-2630/aabb17
language:	English
Journal language:	English
abstract in english:	Many-body localization for a system of bosons trapped in a one-dimensional lattice is discussed. Two models that may be realized for cold atoms in optical lattices are considered. The model with a random on-site potential is compared with previously introduced random interactions model. While the origin and character of the disorder in both systems is different they show interesting similar properties. In particular, many-body localization appears for a sufficiently large disorder as verified by a time evolution of initial density wave states as well as using statistical properties of energy levels for small system sizes. Starting with different initial states, we observe that the localization properties are energy-dependent which reveals an inverted many-body localization edge in both systems (that finding is also verified by statistical analysis of energy spectrum). Moreover, we consider computationally challenging regime of transition between many body localized and extended phases where we observe a characteristic algebraic decay of density correlations which may be attributed to subdiffusion (and Griffiths-like regions) in the studied systems. Ergodicity breaking in the disordered Bose–Hubbard models is compared with the slowing-down of the time evolution of the clean system at large interactions.
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
type:	journal article
subtype:	academic paper