Spontaneous vortex state and $\varphi$-junction in a superconducting bijunction with a localized spin
type: Dataset
description: 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.
issued: 2026-05-05T10:03:20.422077
language: en
modified: 2026-05-05T10:03:20.422082
contact point: Organization
  fn: CCSD
keyword: infoeu-reposemanticsarticle
keyword: josephson-junction-arrays
keyword: josephson-junctions
keyword: journal-articles
keyword: physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother
keyword: quantum-dots
landing page: 1098-0121

Spontaneous vortex state and $\varphi$-junction in a superconducting bijunction with a localized spin
type: Distribution
format: HTML
issued: 2026-05-05T10:03:20.424154
modified: 2026-05-05T10:03:20.406825
access URL: https://hal.science/hal-00997570

test_moissonnage_selune
type: Agent