Conductivity of disordered quantum lattice models at infinite temperature: Many-body localization

Details Conductivity of disordered quantum lattice models at infinite temperature: Many-body localization Conductivity of disordered quantum lattice models at infinite temperature: Many-body localization

2010-03-26

arxiv.org/abs/1003.5224v2

Phys. Rev. B 81, 224429 (2010)

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages, 4 figures. Accepted for publication in Phys. Rev. B

Scientific paper

We reinvestigate the behavior of the conductivity of several disordered quantum lattice models at infinite temperature using exact diagonalization. Contrary to the conclusion drawn in a recent investigation of similar quantities in identical systems, we find evidence of a localized regime for strong random fields. We estimate the location of the critical field for the many-body localization transition for the random-field XXZ spin chain, and compare our findings with recent investigations in related systems.

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