Quench dynamics of fermion-parity switches in a Josephson junction

B. Tarasinski; D. Chevallier; Jimmy A. Hutasoit; B. Baxevanis; C. W. J. Beenakker

doi:10.1103/PhysRevB.92.144306

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Quench dynamics of fermion-parity switches in a Josephson junction

B. Tarasinski, D. Chevallier, Jimmy A. Hutasoit, B. Baxevanis, C. W. J. Beenakker

DOI 10.1103/PhysRevB.92.144306 · Physical Review B

T1

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Abstract

A Josephson junction may be driven through a transition where the superconducting condensate favors an odd over an even number of electrons. At this switch in the ground-state fermion parity, an Andreev bound state crosses through the Fermi level, producing a zero mode that can be probed by a point contact to a grounded metal. We calculate the time-dependent charge transfer between superconductor and metal for a linear sweep through the transition. One single quasiparticle is exchanged with charge Q depending on the coupling energies γ1,γ2 of the metal to the Majorana operators of the zero mode. For a single-channel point contact, Q equals the electron charge e in the adiabatic limit of slow driving, while in the opposite quenched limit Q=2eγ1γ2/(γ1+γ2) varies between 0 and e. This provides a method to produce single charge-neutral quasiparticles on demand.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
InSb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown