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  Quantum Mutual Information as a Probe for Many-Body Localization

De Tomasi, G., Bera, S., Bardarson, J. H., & Pollmann, F. (2017). Quantum Mutual Information as a Probe for Many-Body Localization. Physical Review Letters, 118(1): 016804. doi:10.1103/PhysRevLett.118.016804.

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De Tomasi, G1, Author           
Bera, Soumya1, Author           
Bardarson, Jens H.1, Author           
Pollmann, Frank1, Author           
Affiliations:
1Max Planck Institute for the Physics of Complex Systems, Max Planck Society, ou_2117288              

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 MPIPKS: Strongly correlated electrons
 Abstract: We demonstrate that the quantum mutual information (QMI) is a useful probe to study many-body localization (MBL). First, we focus on the detection of a metal-insulator transition for two different models, the noninteracting Aubry-Andre-Harper model and the spinless fermionic disordered Hubbard chain. We find that the QMI in the localized phase decays exponentially with the distance between the regions traced out, allowing us to define a correlation length, which converges to the localization length in the case of one particle. Second, we show how the QMI can be used as a dynamical indicator to distinguish an Anderson insulator phase from a MBL phase. By studying the spread of the QMI after a global quench from a random product state, we show that the QMI does not spread in the Anderson insulator phase but grows logarithmically in time in the MBL phase.

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 Dates: 2017-01-052017-01-06
 Publication Status: Issued
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 Identifiers: DOI: 10.1103/PhysRevLett.118.016804
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 118 (1) Sequence Number: 016804 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1