Aharonov-casher Effect With Vortices In An Amorphous Superconductor

Aviad Frydman, Roy Arnab

Research output: Contribution to journalMeeting Abstractpeer-review


A trajectory of a magnetic moment in an electric field results in the acquisition of a topological phase called the Aharonov-Casher (A-C) phase, analogous to the A-B phase acquired by a charged particle in a magnetic field. In condensed matter, experiments demonstrating the A-C effect are relatively few, the earliest being for superconducting vortices traversing a fabricated Josephson-junction array. In that regular geometry, a periodic response to induced charge was observed. In an irregular geometry, in analogy with universal conductance fluctuations, a complex quasi-periodic respinse may be expected.
An amorphous superconductor close to a superconductor-insulator transition (SIT) provides such a complex multiply connected region for superconducting vortices to interfere, as indicated by recent studies. In this study with amorphous indium oxide close to a disorder driven SIT, we introduce vortices in the system by applying a perpendicular magnetic field. The motion of these vortices around superconducting islands generates a complex interference pattern in the form of a spontaneous voltage that is tunable with both gate voltage and magnetic field. This effect is a demonstration of the quantum behavior of Josephson vortices which are present in the system close to the SIT.
Original languageEnglish
Article numberW58.00001
JournalBulletin of the American Physical Society,
Issue number1
StatePublished - 6 Mar 2020


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