BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Giuseppe Baio (University of East Anglia) DTSTART:20240305T140000Z DTEND:20240305T145000Z DTSTAMP:20260423T024610Z UID:UEA_mth/4 DESCRIPTION:Title: Monopoles\, Alice rings and topological interfaces in a quantum fluid\ nby Giuseppe Baio (University of East Anglia) as part of Fluids and Struct ures Seminar @ UEA\n\n\nAbstract\nVortices are common natural phenomena\, from turbulence in fluids to atmospheric cyclones. In quantum fields\, the y can emerge with discrete values of circulation. These are topological ex citations (TEs)\, predicted from symmetry arguments alone and showing stri king similarities\, from quantum fluids\, to condensed matter physics and cosmology. Advancements in ultracold atomic physics are prospecting the co ntrolled creation of previously inaccessible TEs in magnetic quantum fluid s known as spinor Bose-Einstein condensates (BECs).\n\nIn this seminar\, I will address TEs and their dynamics in a spin-2 BECs\, where the rich var iety of order-parameter symmetries allows exotic phenomena such as fractio nal vortex charges\, monopoles\, and non-singular spin textures. In partic ular\, I will show how energy relaxation causes a monopole in the uniaxial -nematic phase to deform into a spin-Alice ring\, exhibiting a composite c ore with distinct short- and long-distance topologies [1]. Numerical simul ations reveal dynamical oscillations between the spin-Alice ring and a spl it-core hedgehog configuration. Moreover\, I will also address TEs and the ir stability across optically induced topological interfaces\, where sudde n topology changes occur similarly to the early-universe theories [2].\n\n [1] Baio\, G. & Borgh M. O\, arXiv:2401.04103 (2024).\n[2] Baio\, G. et al .\, Phys. Rev. Research 6\, 013046 (2024).\n LOCATION:https://researchseminars.org/talk/UEA_mth/4/ END:VEVENT END:VCALENDAR