SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 27: Focus Session: Unconventional Transport Phenomena in Low-Dimensional Superconducting Heterostructures
TT 27.6: Vortrag
Mittwoch, 29. März 2023, 11:45–12:00, HSZ 03
Theoretical study of the supercurrent diode effect in 2DEG Josephson junctions — •Andreas Costa1, Denis Kochan1,2, and Jaroslav Fabian1 — 1University of Regensburg, Germany — 2Slovak Academy of Sciences, Slovakia
Superconducting junctions exhibit fascinating physical phenomena, making them promising building blocks for quantum computing. The competition between the two fundamental spin interactions—ferromagnetic exchange and spin-orbit interaction (SOI)—and superconductivity has already been demonstrated to substantially modify the spectroscopic and transport signatures of these junctions, and potentially results in topological superconductivity.
In this talk, we will focus on 2DEG-based S-N-S Josephson junctions that combine intrinsic SOI with proximity-induced superconductivity originating, e.g., from top Al islands. We will demonstrate that turning the nonsuperconducting (N) weak link additionally ferromagnetic—e.g., through a magnetic field—can imprint a strong direction dependence on the current-phase relation, which finally rises a substantial difference between positive and negative critical currents, and thereby a pronounced supercurrent diode effect. Motivated by pioneering experimental studies [1–3], we will elaborate on powerful theoretical approaches—such as numerical tight-binding simulations [2, 3] and analytical studies of the Andreev spectrum—to characterize and understand the features of this Josephson supercurrent diode effect.
[1] Phys. Rev. Lett. 126, 037001 (2021)
[2] Nat. Nanotechnol. 17, 39 (2022)
[3] J. Phys. Condens. Matter 34, 154005 (2022)