Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Superconductivity: Supercurrent Diode Effect
TT 25.3: Vortrag
Mittwoch, 19. März 2025, 10:00–10:15, H32
Tunable Field-Free Unidirectional Diode Effect in Single-Crystal Superconducting Device — •Tobias Faeth1, Damien Berube2, Killian Rigaux2, Yuqiang Fang3, Anyuan Gao2, Thao Dinh2, Yufei Liu2, Jianxiang Qiu2, Houchen Li2, Charles Reichhardt4, Cynthia Reichhardt4, Fuqiang Huang3, and Suyang Xu2 — 1Max Plack Instiute for Microstructure Physics, Halle (Saale), Germany — 2Harvard University, Cambridge, USA — 3Bejing University, Beijing, China — 4Los Alamos National Laboratory, Los Alamos, USA
Superconducting diodes could become critical components of multiple technologies, from energy-efficient superconducting computing to large scale effective quantum computing, memories and switches. In this talk, we report a device made out of a 2D superconductor, that exhibits field-free, tunable, and perfectly rectifying diode effect. Starting from finite field differential conductance experiments, we demonstrate diode efficiencies up to 30% at 100mT. Measuring nonlinear resistances, we characterize magnetochiral anisotropy (MCA) and calculate a MCA coefficient of γ = 6.0×108 T−1A−1, the highest ever reported. Setting the field back to 0, we investigate a novel geometry, while carrying out differential conductance measurements. In the new geometry, we find Ic+ = 0 while Ic− = 2 µ A, a 100% diode efficiency. We hypothesize this effect is attributed to uneven vortex flow under opposite biases. We substantiate this model with computations that confirm increased diode efficiency under the novel geometry.
Keywords: diode effect; 2D material; magnetochiral anisotropy; superconductor; device