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 27.2: Hauptvortrag
Mittwoch, 29. März 2023, 10:00–10:30, HSZ 03
Quasiparticle-based and Cooper-pair based superconducting diodes — •Maria Spies1, Stefan Ilić2, Sebastián Bergeret2, Francesco Giazotto1, and Elia Strambini1 — 1NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56127 Pisa, Italy — 2Centro de Física de Materiales (CFM-MPC) Centro Mixto CSICUPV/ EHU, E-20018 Donostia-San Sebastián, Spain
Diodes are key elements for electronics, optics, and detection. Their evolution towards low dissipation electronics has lead to the hybridization with superconductors (S) and the realization of non-reciprocal transport of both quasiparticles and Cooper pairs. That occurs when both spatial inversion and time-reversal symmetries are broken.
Here, we review both effects comparing their efficiencies and basic principles. The quasi-particle diode is a superconducting tunnel junction with zero conductance in only one direction. The directionselective propagation of the charge has been obtained through the broken electron-hole symmetry induced by the spin selection of a ferromagnetic tunnel barrier made of a EuS thin film separating a superconducting Al and a normal metal Cu layer. It achieves a large rectification of up to 40%.
On the other hand, supercurrent diodes made with hybrid S/spinorbit/ S Josephson Junctions or with two-dimensional Rashba superconductors have been demonstrated to show zero resistance in only one direction. We describe the equation of the supercurrent diode effect in a generic formalism that may inspire novel devices based on helical magnetism induced in conventional superconductors.