Fig. 1: Andreev bound state fusion in a nanowire with three segments, separated by two electrically tunable tunnel barriers. | Communications Physics

Fig. 1: Andreev bound state fusion in a nanowire with three segments, separated by two electrically tunable tunnel barriers.

From: Intermediate states in Andreev bound state fusion

Fig. 1

a Individual discrete Andreev bound states (ABSs, red and light blue arrows) form in the two lead segments LS1,2 coupled to the superconducting reservoirs S1,2 (blue), with Andreev reflections at the S - LS interfaces. Discrete single particle bound states form on the central quantum dot (QD) between the barriers (grey). b With increasing tunnel coupling (black arrows), the ABSs of both lead segments hybridize individually with the QD, forming a molecular state between single and two-particle bound states. c If the coupling becomes strong enough, the ABSs of all segments fuse into two (time resolved) extended ABSs, eventually carrying a Josephson current.

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