Direct Measurement of Current-Phase Relations in Superconductor/Topological Insulator/Superconductor Junctions

作者：Sochnikov Ilya^*; Bestwick Andrew J; Williams James R; Lippman Thomas M; Fisher Ian R; Godhaber Gordon David; Kirtley John R; Moler Kathryn A

来源：Nano Letters, 2013, 13(7): 3086-3092.

DOI：10.1021/nl400997k

• Topological insulator
• Majorana fermions
• superconducting proximity effect
• current-phase relation
• Josephson junction
• scanning SQUID microscopy

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 2 pi-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.

• 出版日期2013-7