Direct measurement of current-phase relations in superconductor/topological insulator/superconductor junctions.
basic_science · Level V
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- Record sourced from PubMed, PMID 23795666.
- Also identified by DOI 10.1021/nl400997k.
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Abstract
Proximity to a superconductor is predicted to induce exotic quantum phases in topological insulators. Here, scanning superconducting quantum interference device (SQUID) microscopy reveals that aluminum superconducting rings with topologically insulating Bi2Se3 junctions exhibit a conventional, nearly sinusoidal 2π-periodic current-phase relations. Pearl vortices occur in longer junctions, indicating suppressed superconductivity in aluminum, probably due to a proximity effect. Our observations establish scanning SQUID as a general tool for characterizing proximity effects and for measuring current-phase relations in new materials systems.