Abstract
We calculate the transport properties of a disordered Bose condensate. A superlattice made from two-dimensional planes of bosons in the condensate phase is considered. The disorder is due to charged impurities. We consider a homogeneous distribution of impurities and also impurities randomly distributed in planes. The dispersion relation of the collective excitations (plasmons) for the clean boson superlattice is calculated. The disorder induced phase transiton from a superfluid phase to an insulator phase is discussed and the static conductivity (σ c ) at the transition point is expressed in terms of the microscopic parameters of the model. For strongly coupled planes we find thatσ c is of ordere 2/h. The relation of our theoretical results to experiments with high-temperature superconductors is discussed.
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Gold, A. Superconductor-insulator transition in disordered boson-superlattices. Z. Physik B - Condensed Matter 81, 155–164 (1990). https://doi.org/10.1007/BF01309344
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DOI: https://doi.org/10.1007/BF01309344