Optical conductivity of granular aluminum films near the Mott metal-to-insulator transition

Aviv Glezer Moshe, Eli Farber, Guy Deutscher

Research output: Contribution to journalArticlepeer-review

Abstract

We report measurements of the energy gap of granular aluminum films by THz spectroscopy. We find that as the grains progressively decouple, the coupling ratio 2Δ(0)/kBTc increases above the BCS weak-coupling ratio 3.53, and reaches values consistent with an approach to BCS-BEC crossover for the high-resistivity samples, expected from the short coherence length. The Mattis-Bardeen theory describes remarkably well the behavior of σ1,s/σ1,n for all samples up to very high normal-state resistivities.

Original languageEnglish
Article number224503
JournalPhysical Review B
Volume99
Issue number22
DOIs
StatePublished - 5 Jun 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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