Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Superconductivity: Supercurrent Diode Effect
TT 25.4: Vortrag
Mittwoch, 19. März 2025, 10:15–10:30, H32
Tunable Diode effect in a Superconducting Tunnel Junction with Biharmonic Drive — •David Scheer1, Rubén Seoane Souto2, Fabian Hassler1, and Jeroen Danon3 — 1Institute for Quantum Information, RWTH Aachen University, 52056 Aachen, Germany — 2Instituto de Ciencia de Materiales de Madrid, Consejo Superiorde Investigaciones Científicas (ICMM-CSIC), 28049, Madrid, Spain — 3Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
A Josephson diode is a superconducting circuit element that enables non-reciprocal transport, allowing a dissipationless supercurrent to preferentially flow in a single direction. Existing methods for achieving the required symmetry breaking mostly rely on specifically-designed materials or carefully-engineered circuits composed of multiple Josephson junctions. In this talk, we demonstrate that applying a biharmonic drive to a conventional superconducting tunnel-junction induces a diode effect through harmonic mixing processes that shift the supercurrent region. We show that, in a conventional tunnel junction, unit efficiency is achievable while maintaining a large supercurrent. Moreover, the relative phase between the two driving tones determines the directionality of the diode, which can be tuned in situ.
Keywords: Superconducting diode effect