Andreev Bound-State Dynamics in Quantum-Dot Josephson Junctions: A Washing Out of the 0-π Transition
Langue
en
Article de revue
Ce document a été publié dans
Physical Review Letters. 2015-01-22, vol. 114, n° 3, p. 037003 (1-5)
American Physical Society
Résumé en anglais
We consider a Josephson junction formed by a quantum dot connected to two bulk superconductors in the presence of Coulomb interaction and coupling to both an electromagnetic environment and a finite density of electronic ...Lire la suite >
We consider a Josephson junction formed by a quantum dot connected to two bulk superconductors in the presence of Coulomb interaction and coupling to both an electromagnetic environment and a finite density of electronic quasiparticles. In the limit of a large superconducting gap we obtain a Born-Markov description of the relevant Andreev bound-states dynamics. We calculate the current-phase relation and we find that the experimentally unavoidable presence of quasiparticles can dramatically modify the 0−π standard transition picture. We show that photon-assisted quasiparticle absorption allows the dynamic switching from the 0 to the π state and vice versa, washing out the 0−π transition predicted by purely thermodynamic arguments. Spectroscopic signatures of Andreev bound-states broadening are investigated by considering microwave irradiation.< Réduire
Mots clés en anglais
Pi-junction
Andreev Bound states
quantum transport
superconductivity
Josephson junction
Project ANR
Nano Mécanique Quantique - ANR-10-BLAN-0404
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