Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 15: Topology: Majorana Physics
TT 15.11: Talk
Monday, March 9, 2026, 17:45–18:00, HSZ/0105
Manipulating the topological spin of Majoranas — •Stijn de Wit1, Emre Duman2, Mert Bozkurt3, Alexander Brinkman1, and Inanc Adagideli1,2 — 1MESA+ Institute for Nanotechnology, University of Twente, The Netherlands — 2Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul, Turkey — 3QuTech, Delft University of Technology, Delft 2600 GA, The Netherlands
The non-Abelian exchange statistics of Majorana zero modes make them interesting for both technological applications and fundamental research. Unlike their non-Abelian counterpart, the Abelian contribution is often neglected in the discussion of Majorana braiding. We consider Majoranas bound to vortices in topological superconductors. Here, the Abelian exchange phase originates from the Majoranas so-called topological spin, and it is interpreted as an Aharonov-Casher phase arising from a vortex encircling an e/4 charge. In this work, we show how this fractional charge and hence the topological spin of Majoranas can be manipulated, introducing an additional knob for braiding operations in topological quantum computing. Final, we propose a vortex interference experiment to probe the presence of this fractional e/4 charge.
Keywords: Majorana; Fractional Charge; Braiding; Josephson junction; Topological Quantum Computing