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09 February 2025
 
  » arxiv » 1109.0245

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Giant positive magnetoresistance and localization in bosonic insulators
Markus Mueller ;
Date 1 Sep 2011
AbstractWe study the strong localization of bosons, motivated by several experiments that suggest a bosonic superconductor-insulator transition in strongly disordered films. In the insulator, unlike for fermions, nearly all scattering paths between low-energy sites contribute positive amplitudes, which interfere constructively in the hopping matrix element. The localization length of bosonic excitations shrinks as the constructive interference is suppressed by a magnetic field. This entails a giant positive magnetoresistance, opposite to the analogous effect in strongly localized fermions. Within the forward scattering approximation, the localization length is found to increase with decreasing energy. Applying the same technique to hard core bosons on a Bethe lattice with large connectivity, we find the superfluid to emerge without concomitant closing of a mobility gap in the insulator.
Source arXiv, 1109.0245
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