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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2014

Spontaneous vortex state and $\varphi$-junction in a superconducting bijunction with a localized spin

C. A. Balseiro
  • Fonction : Auteur

Résumé

A Josephson bijunction made of three superconductors connected by a quantum dot is considered in the regime where the dot carries a magnetic moment. In the range of parameters where such a dot, if inserted in a two-terminal Josephson junction, creates a $\pi$-shift of the phase, the bijunction forming a triangular unit is frustrated. This frustration is studied both within a phenomenological and a microscopic model. Frustration stabilizes a phase vortex centered on the dot, with two degenerate states carrying opposite vorticities, independently of the direction of the magnetic moment. Embedding the bijunction in a superconducting loop allows to create a tunable "$\varphi$"-junction whose equilibrium phase can take any value. For large enough inductance, it generates noninteger spontaneous flux. Multi-loop configurations are also studied.

Dates et versions

hal-00997570 , version 1 (28-05-2014)

Identifiants

Citer

Denis Feinberg, C. A. Balseiro. Spontaneous vortex state and $\varphi$-junction in a superconducting bijunction with a localized spin. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 90 (7), pp.075432. ⟨10.1103/PhysRevB.90.075432⟩. ⟨hal-00997570⟩

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