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Microwave-assisted tunneling and interference effects in superconducting junctions under fast driving signals

Piotr Kot, Robert Drost, Maximilian Uhl, Joachim Ankerhold, Juan Carlos Cuevas, and Christian R. Ast
Phys. Rev. B 101, 134507 – Published 16 April 2020
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Abstract

As scanning tunneling microscopy is pushed towards fast local dynamics, a quantitative understanding of tunnel junctions under the influence of a fast ac driving signal is required, especially at the ultralow temperatures relevant to spin dynamics and correlated electron states. We subject a superconductor-insulator-superconductor junction to a microwave signal from an antenna mounted in situ and examine the dc response of the contact to this driving signal. Quasiparticle tunneling and the Josephson effect can be interpreted in the framework of Tien-Gordon theory. The situation is more complex when it comes to higher-order effects such as multiple Andreev reflections. Microwave-assisted tunneling unravels these complex processes, providing deeper insights into tunneling than are available in a pure dc measurement.

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  • Received 23 December 2019
  • Revised 11 March 2020
  • Accepted 13 March 2020

DOI:https://doi.org/10.1103/PhysRevB.101.134507

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Piotr Kot1, Robert Drost1,*, Maximilian Uhl1, Joachim Ankerhold2, Juan Carlos Cuevas3, and Christian R. Ast1

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany
  • 2Institut für Komplexe Quantensysteme and IQST, Universität Ulm, Albert-Einstein-Allee 11, 89069 Ulm, Germany
  • 3Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain

  • *Corresponding author: r.drost@fkf.mpg.de

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Issue

Vol. 101, Iss. 13 — 1 April 2020

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