Quench dynamics of fermion-parity switches in a Josephson junction
| Autor: | B. Baxevanis, Jimmy A. Hutasoit, Brian Tarasinski, Denis Chevallier, C. W. J. Beenakker |
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| Rok vydání: | 2015 |
| Předmět: |
Josephson effect
Superconductivity Physics Zero mode Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Fermi level FOS: Physical sciences Fermion Electron Condensed Matter Physics Electronic Optical and Magnetic Materials symbols.namesake Condensed Matter::Superconductivity Bound state Mesoscale and Nanoscale Physics (cond-mat.mes-hall) symbols Quasiparticle Mathematics::Metric Geometry Atomic physics |
| Zdroj: | PHYSICAL REVIEW B PHYSICAL REVIEW B, 92(14), 144306 |
| DOI: | 10.48550/arxiv.1503.04207 |
| Popis: | 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 $\gamma_1,\gamma_2$ 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 $Q=2e\sqrt{\gamma_1\gamma_2}/(\gamma_1+\gamma_2)$ varies between $0$ and $e$. This provides a method to produce single charge-neutral quasiparticles on demand. Comment: 10 pages, 5 figures, v. 3: numerical simulation and a derivation of charge transfer in adiabatic regime added, v. 4: multi-channel probe case added |
| Databáze: | OpenAIRE |
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