Supercurrent through an Andreev trimer
arxiv(2024)
摘要
Detection and control of Andreev Bound States (ABSs) localized at
semiconductor-superconductor interfaces are essential for their use in quantum
applications. Here we investigate the impact of ABSs on the supercurrent
through a Josephson junction containing a quantum dot (QD). Additional
normal-metal tunneling probes on both sides of the junction unveil the ABSs
residing at the semi-superconductor interfaces. Such knowledge provides an
ingredient missing in previous studies, improving the connection between theory
and experimental data. By varying the ABS energies using electrostatic gates,
we show control of the switching current, with the ability to alter it by more
than an order of magnitude. Finally, the large degree of ABS tunability allows
us to realize a three-site ABS-QD-ABS molecule (Andreev trimer) in which the
central QD is screened by both ABSs. This system is studied simultaneously
using both supercurrent and spectroscopy.
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