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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 9: Theoretical Aspects of Condensed Matter II

MP 9.5: Talk

Wednesday, March 20, 2024, 11:10–11:30, HL 102

Magnus effect on a Majorana zero-mode — •Gal Lemut¹, Michal Jan Pacholski², Stephan Plugge³, Carlo Willem Joannes Beenakker⁴, and Inanc Adagideli⁵ — ¹Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Berlin, Germany — ²Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — ³Silicon Quantum Computing, Sydney, New South Wales, Australia — ⁴Instituut-Lorentz, Universiteit Leiden, Leiden, The Netherland — ⁵Faculty of Engineering and Natural Sciences, Sabanci University, Orhanli-Tuzla, Istanbul, Turkey

A supercurrent on the proximitized surface of a topological insulator can cause a delocalization transition of a Majorana fermion bound to a vortex core as a zero-mode. Here we study the dynamics of the deconfinement, as a manifestation of the Magnus effect (the coupling of the superflow to the velocity field in the vortex). The initial acceleration of the Majorana fermion is ±2v_f²Kℏ, perpendicular to the Cooper pair momentum K, for a ±2π winding of the superconducting phase around the vortex. The quasiparticle escapes with a constant velocity from the vortex core, which we calculate in a semiclassical approximation and compare with computer simulations

Keywords: Topological superconductor; Vortex lattice; Majorana zero modes; Surface states; Proximity effect