KTaO3‑Based Supercurrent Diode
Muqing Yu, Jieun Kim, Ahmed Omran, Zhuan Li, Jiangfeng Yang, Sayanwita Biswas, Chang-Beom Eom, David Pekker, Patrick Irvin, Jeremy Levy
TL;DR
Researchers demonstrated a supercurrent diode effect using a LAO/KTO interface, enabling nonreciprocal superconducting currents with potential applications in quantum circuits.
Contribution
A reconfigurable superconducting weak link platform at the LAO/KTO interface is introduced to realize the supercurrent diode effect.
Findings
The supercurrent diode effect is achieved using nanoscale weak link geometry at the LAO/KTO interface.
The rectification efficiency reaches up to 13% under optimal magnetic field conditions.
Asymmetric vortex motion due to inversion-symmetry-breaking geometry explains the observed effect.
Abstract
The supercurrent diode effect (SDE), characterized by nonreciprocal critical currents, represents a promising building block for future dissipationless electronics and quantum circuits. Realizing SDE requires breaking both time-reversal and inversion symmetry in the device. Here we use conductive atomic force microscope (c-AFM) lithography to pattern reconfigurable superconducting weak links (WLs) at the LaAlO3/KTaO3 (LAO/KTO) interface. By deliberately engineering the WL geometry at the nanoscale, we realize SDE in these devices in the presence of modest out-of-plane magnetic fields. The SDE polarity can be reversed by simply changing the WL position, and the rectification efficiency reaches up to 13% under optimal magnetic field conditions. Time-dependent Ginzburg–Landau simulations reveal that the observed SDE originates from asymmetric vortex motion in the…
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Taxonomy
TopicsElectronic and Structural Properties of Oxides · Iron-based superconductors research · Advanced Condensed Matter Physics