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Researchers discovered stable Josephson vortex loops in superconductors, enabling new possibilities for terahertz technology applications like emitters and filters.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Topological Matter

Background:

  • Linked and knotted vortex loops are topological entities observed in various physical systems.
  • In superconductors, vortex loops are typically unstable unless supported by specific magnetic fields.
  • Previous research has not fully explored vortex loop formation in planar junctions or layered superconductors.

Purpose of the Study:

  • To reveal a new type of vortex matter in superconductors: Josephson vortex loops.
  • To demonstrate the formation and stabilization of these loops in planar junctions and layered superconductors.
  • To explore the potential applications of engineered Josephson vortex loops in nanostructured superconductors.

Main Methods:

  • Investigated the behavior of Josephson vortices in planar junctions and layered superconductors.
  • Introduced engineered barriers to control vortex motion and facilitate loop formation.
  • Analyzed the topological properties and stability of the resulting vortex structures.

Main Results:

  • Successfully formed and stabilized novel Josephson vortex loops in superconducting planar junctions and layered systems.
  • Demonstrated that nontrivial cutting and recombination of Josephson vortices around engineered barriers lead to loop stabilization.
  • Identified Josephson vortex loops as a new form of vortex matter in superconductors.

Conclusions:

  • Josephson vortex loops represent a significant advancement in understanding vortex matter in superconductors.
  • Engineered barriers offer a method for manipulating and controlling these vortex loops and other complex topologies.
  • High-frequency excitations of Josephson loops hold promise for developing advanced terahertz devices, including emitters, filters, and waveguides.