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Article Dans Une Revue The European Physical Journal B: Condensed Matter and Complex Systems Année : 2015

Quartets and the current-phase structure of a double quantum dot superconducting bijunction at equilibrium

Denis Feinberg
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Jérôme Rech
Régis Mélin

Résumé

The equilibrium current-phase structure of a tri-terminal superconducting Josephson junction (bijunction) is analyzed as a function of the two relevant phases. The bijunction is made of two noninteracting quantum dots, each one carrying a single level. Nonlocal processes coupling the three terminals are described in terms of quartet tunneling and pair cotunneling. These couplings are due to nonlocal Andreev and cotunneling processes through the central superconductor S 0, as well as direct interdot coupling. In some cases, two degenerate midgap Andreev states appear, symmetric with respect to the (π,π) point. The lifting of this degeneracy by interdot couplings induces a strong non-local inductance at low enough temperatures. This effect is compared to the mutual inductance of a two-loop circuit.

Dates et versions

hal-01233729 , version 1 (25-11-2015)

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Denis Feinberg, Thibaut Jonckheere, Jérôme Rech, T. Martin, Benoît Douçot, et al.. Quartets and the current-phase structure of a double quantum dot superconducting bijunction at equilibrium. The European Physical Journal B: Condensed Matter and Complex Systems, 2015, 88 (4), pp.99. ⟨10.1140/epjb/e2015-50849-3⟩. ⟨hal-01233729⟩
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