Many-body localization in system with a completely delocalized single-particle spectrum

Many-body localization (MBL) in a one-dimensional Fermi Hubbard model with random on-site interactions is studied. While for this model all single-particle states are trivially delocalized, it is shown that for sufficiently strong disordered interactions the model is many-body localized. It is there...

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Bibliographic Details
Published in:Physical review. B 2016-11, Vol.94 (20), Article 201116
Main Authors: Bar Lev, Yevgeny, Reichman, David R., Sagi, Yoav
Format: Article
Language:English
Subjects:
Anderson localization
Charge transport
Localization
Many body interactions
Phenomenology
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Summary:Many-body localization (MBL) in a one-dimensional Fermi Hubbard model with random on-site interactions is studied. While for this model all single-particle states are trivially delocalized, it is shown that for sufficiently strong disordered interactions the model is many-body localized. It is therefore argued that MBL does not necessarily rely on localization of the single-particle spectrum. This model provides a convenient platform to study pure MBL phenomenology, since Anderson localization in this model does not exist. By examining various forms of the interaction term, a dramatic effect of symmetries on charge transport is demonstrated. A possible realization in a cold atom experiment is proposed.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.94.201116