Dresden 2020 – wissenschaftliches Programm
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TT 31: Superconducting Electronics: SQUIDs, Qubits, Circuit QED, Quantum Coherence and Quantum Information Systems 1
TT 31.6: Vortrag
Mittwoch, 18. März 2020, 10:45–11:00, HSZ 03
Fluxoid dynamics in high impedance long Josephson junctions — •Micha Wildermuth1, Lukas Powalla1, Konrad Dapper1, Yannick Schön1, Jan Nicolas Voss1, Hannes Rotzinger1,2, and Alexey V. Ustinov1,3,4 — 1Institute of Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Institute for Solid-State Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany — 3National University of Science and Technology MISIS, Moscow, Russia — 4Russian Quantum Center, Skolkovo, Moscow, Russia
The dynamics of Josephson vortices in long Josephson junctions is a well-known example of soliton physics and allows to study highly nonlinear effects on a mesoscopic scale. We experimentally study the characteristics of a Josephson junction with electrodes having a large kinetic inductance fraction which provides an additional degree of freedom. The London penetration depth exceeds the stack thickness which results in an incomplete screening of magnetic fields and in fluxoids with an altered shape. We present transport measurements of long Josephson junctions with electrodes made from disordered oxidized aluminum showing current steps with and without external magnetic fields and the IV-characteristics resemble the Fiske and zero-field steps. Magnetic field dependent measurements also show a very similar behavior to conventional long Josephson junctions.