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Article overview
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Giant positive magnetoresistance and localization in bosonic insulators | Markus Mueller
; | Date: |
1 Sep 2011 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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