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Dimensional crossover of MBL published in PRL

last modified Apr 18, 2016 12:36 PM
Our paper on the dimensional crossover of Many-body localization was published as an Editor's suggestion in PRL. In this work we could show that individual localized systems can-when coupled together-start to act as a bath for themselves and restore ergodic behavior.
Dimensional crossover of MBL published in PRL

1D systems with identical disorder but independent initial states are coupled via transversal (intertube) tunneling.

Many-Body Localization (MBL) represents a generic alternative to thermalization in isolated quantum systems,  it describes interacting systems that cannot act as a bath for themselves and can therefore not be describes by standard statistical physics. Using a gas of ultracold fermions in an optical lattice, we artifically prepare an initial charge density wave in an array of 1D tubes with quasi-random onsite disorder and monitor the subsequent dynamics over several thousand tunneling times. We find a strikingly different behavior between MBL and Anderson Localization. While the non-interacting Anderson case remains localized, in the interacting case any coupling between the tubes leads to a delocalization of the entire system.

Phys. Rev. Lett. 116, 140401 (2016)

 

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