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TT: Fachverband Tiefe Temperaturen

TT 55: Superconductivity: Tunnelling and Josephson Junctions

TT 55.8: Vortrag

Donnerstag, 19. März 2020, 11:45–12:00, HSZ 204

Microwave-assisted tunnelling and interference effects in superconducting junctions under fast driving signals — •Robert Drost¹, Peter Kot¹, Maximilian Uhl¹, Juan Carlos Cuevas², Joachim Ankerhold³, and Christian Ast¹ — ¹Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany — ²Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain — ³Institut für Komplexe Quantensysteme and IQST, Universität Ulm, Albert-Einstein-Allee 11, 89069 Ulm, Germany

As scanning tunnelling 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 ultra-low 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. Basic quasi-particle tunnelling can be interpreted using a modified density of states in the electrodes. The situation is more complex when it comes to higher order effects such as multiple Andreev reflections. Microwave assisted tunnelling unravel these complex processes, providing deeper insights into tunnelling than are available in a pure DC measurement.