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DTSTAMP:20261022T101524Z
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DTSTART:20261026T110000
DTEND:20261026T120000
DESCRIPTION:Quantized vortices are among the clearest manifestations of top
 ology in condensed matter: the winding of the superconducting phase protec
 ts flux quantization. In superconductors with multicomponent order paramet
 ers\, vortices can fractionalize\, carrying only a fraction of the flux qu
 antum. Well-known examples\, such as half-quantum vortices in spin-triplet
  superfluids\, are dictated by symmetry. But is the symmetry of the order 
 parameter the whole story?\nIn this talk\, I will argue that it is not. St
 arting from the roles of topology (what is protected) and symmetry (what i
 s allowed)\, I will show how microscopic degrees of freedom select which v
 ortex states are realized. In multiband superconductors\, frustrated inter
 band interactions can spontaneously break time-reversal symmetry and give 
 rise to fractional vortices with non-universal flux [1]\, as well as skyrm
 ion-like coreless vortices [2]. In kagome superconductors\, the sublattice
  structure stabilizes coreless vortices that point-group symmetry alone wo
 uld not single out [3].\n\n[1] Y. Iguchi et al.\, Science 380\, 1244 (2023
 ).\n[2] A. Benfenati\, M. Barkman\, and E. Babaev\, Phys. Rev. B 107\, 094
 503 (2023).\n[3] F. A. S. Philipsen\, M. Barkman\, A. Kreisel\, and B. M. 
 Andersen\, Phys. Rev. B 114\, 194512 (2026).\n
LOCATION:ETH Zürich\, Hönggerberg HIT K 51
ORGANIZER:Mats Ola Erik Barkman
SUMMARY:Fractional Vortices in Multiband and Kagome Superconductors: Topolo
 gy\, Symmetry and Beyond
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