Statistical detection of Josephson, Andreev, and single quasiparticle currents in scanning tunneling microscopy

We present a method to identify distinct tunneling modes in tunable superconducting tunnel junction composed of superconducting tip and sample in scanning tunneling microscope. Combining the measurement of the relative decay constant of tunneling current extracted from I-V-z spectroscopy with its st...

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Bibliographic Details
Published inarXiv.org
Main Authors Ko, Wonhee, Dumitrescu, Eugene F, Petro Maksymovych
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 04.12.2020
Subjects
Crossovers
Decay rate
Elementary excitations
Identification methods
Leaky modes
Physics - Mesoscale and Nanoscale Physics
Physics - Superconductivity
Statistical analysis
Superconductivity
Superconductor junctions
Superconductors
Tunnel junctions
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Summary:We present a method to identify distinct tunneling modes in tunable superconducting tunnel junction composed of superconducting tip and sample in scanning tunneling microscope. Combining the measurement of the relative decay constant of tunneling current extracted from I-V-z spectroscopy with its statistical analysis over the atomic disorders in the sample surface, we identified the crossover of tunneling modes between single quasiparticle tunneling, multiple Andreev reflection, and Josephson tunneling with respect to the bias voltage. The method enables one to determine the particular tunneling regime independently of the spectral shapes, and to reveal the intrinsic modulation of Andreev reflection and Josephson current that would be crucial for quantum device application of superconductors.
ISSN:2331-8422
DOI:10.48550/arxiv.2012.02653