Anomalous supercurrent and diode effect in locally perturbed topological Josephson junctions
arxiv(2024)
摘要
The simultaneous breaking of time-reversal and inversion symmetry can lead to
peculiar effects in Josephson junctions, such as the anomalous Josephson effect
or supercurrent rectification, which is a dissipationless analog of the diode
effect. Due to their impact in new quantum technologies, it is important to
find robust platforms and external means to manipulate the above effects in a
controlled way. Here, we theoretically consider a quantum spin Hall-based
Josephson junction subjected to a magnetic field in the direction defined by
spin-momentum locking, and in presence of a local tip in close proximity to the
normal region. We consider different local perturbations, model normal and
magnetic tips, and study how they affect the Josephson response of the device.
In particular, we argue that magnetic tips are a useful tool that allows for
tunability of both ϕ_0 response and supercurrent rectification.
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