Facilitation dynamics and localization phenomena in Rydberg lattice gases with position disorder

Marcuzzi, Matteo and Minář, Jiří and Barredo, Daniel and Léséleuc, Sylvain de and Labuhn, Hening and Lahaye, Thierry and Browaeys, Antoine and Levi, Emanuele and Lesanovsky, Igor (2017) Facilitation dynamics and localization phenomena in Rydberg lattice gases with position disorder. Physical Review Letters, 118 (6-10). 063606/1-063606/6. ISSN 1079-7114

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Abstract

We explore the dynamics of Rydberg excitations in an optical tweezer array under anti-blockade (or facilitation) conditions. Due to the finite temperature the atomic positions are randomly spread, an effect that leads to quenched correlated disorder in the interatomic interaction strengths. This drastically affects the facilitation dynamics as we demonstrate experimentally on the elementary example of two atoms. To shed light on the role of disorder in a many-body setting we show that here the dynamics is governed by an Anderson-Fock model, i.e. an Anderson model formulated on a lattice with sites corresponding to many-body Fock states. We first consider a one-dimensional atom chain in a limit which is described by a one-dimensional Anderson-Fock model with disorder on every other site, featuring both localized and delocalized states. We then illustrate the effect of disorder experimentally in a situation in which the system maps on a two-dimensional Anderson-Fock model on a trimmed square lattice. We observe a clear suppression of excitation propagation which we ascribe to the localization of the many-body wavefunctions in Hilbert space.

Item Type: Article
Additional Information: ©2017 American Physical Society
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1103/PhysRevLett.118.063606
Depositing User: Minar, Jiri
Date Deposited: 14 Mar 2017 09:13
Last Modified: 14 Mar 2017 11:37
URI: http://eprints.nottingham.ac.uk/id/eprint/41254

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