Kavli Affiliate: Michael Wimmer
| First 5 Authors: Chun-Xiao Liu, Guanzhong Wang, Tom Dvir, Michael Wimmer,
| Summary:
Two spatially separated quantum dots connected by a common superconductor has
been studied extensively for Cooper pair splitting, and is predicted to be the
building block of an emulated Kitaev chain. The effective couplings between
quantum dots mediated by the middle superconductor is crucial for observing
these intriguing physical phenomena, but unfortunately, a method of tuning the
effective couplings is still lacking, obstructing further experimental
progresses in relevant studies. Here we propose to mediate tunable effective
couplings via Andreev bound states in a semiconductor-superconductor nanowire.
We show explicitly how the coupling strengths depend on the physical parameters
of the Andreev bound states, e.g., chemical potential, induced Zeeman spin
splitting and spin-orbit interaction. Furthermore, we propose to extract the
effective coupling strengths from resonant current in a three-terminal
junction. Our findings will facilitate future experiments on Cooper pair
splitting as well as the experimental realization of the Kitaev chain in
quantum dots.
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