Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 25: Superconductivity: Supercurrent Diode Effect

TT 25.10: Vortrag

Mittwoch, 19. März 2025, 12:00–12:15, H32

Magnetoelectric phenomena and radial Rashba diode effect in non-centrosymmetric superconductors — •Denis Kochan — Department of Physics, National Cheng Kung University, Tainan, Taiwan — Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia

The superconducting diode effect is a magneto-electric phenomenon where an external magnetic field imparts a non-zero center-of-mass momentum to Cooper pairs, either facilitating or hindering the flow of electric current depending on its direction. One possible mechanism leading to SDE is a lack of inversion symmetry that facilitates spin splitting of the electronic bands by the underlying spin-orbit coupling (SOC). When breaking also the time-reversal by a weak magnetic/exchange field the Cooper pairs condensate displays intriguing magneto-electric and magneto-chiral effects.

This talk will present a theoretical overview and key experimental observations, particularly supercurrent diode effect and Josephson inductance anisotropy in InAs-quantum well-based junctions [1], zero-pi-like transitions and anomalous Josephson effect in non-centrosymmetric systems [2], enhanced vortex pinning and squeezing in Rashba-based superconductors [3]. The new kid on the block is the radial Rashba SOC giving rise to a novel Radial Rashba spin-diode effect [4].

[1] Nat. Nanotech. 17, 39 (2022).

[2] Nat. Nanotech. 18, 1h266 (2023).

[3] Phys. Rev. X 12, 041020 (2022).

[4] Phys. Rev. Lett. 133, 216201 (2024).

Keywords: 2D materials; superconducting diode effect