Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 55: Topology and symmetry protected materials & Topological insulators (joint session O/HL/TT)
TT 55.6: Vortrag
Mittwoch, 11. März 2026, 16:15–16:30, HSZ/0401
Majorana-metal transition in a disordered superconductor: percolation in a landscape of topological domain walls — Vladimir A Zakharov1, Ion Cosma Fulga2,3, •Gal Lemut4, Jakub Tworzydło5, and Carlo W. J. Beenakker1 — 1Instituut-Lorentz, Universiteit Leiden, PO Box 9506, 2300 RA Leiden, The Netherlands — 2Institute for Theoretical Solid State Physics, IFW Dresden, Germany — 3Würzburg-Dresden Cluster of Excellence ct.qmat, Dresden, Germany — 4Dahlem Center for Complex Quantum Systems and Physics Department, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 5Faculty of Physics, University of Warsaw, ul. Pasteura 5, 02-093 Warszawa, Poland
Most superconductors are thermal insulators. A disordered chiral p-wave superconductor, however, can make a transition to a thermal metal phase. Because heat is then transported by Majorana fermions, this phase is referred to as a Majorana metal. Here we present numerical evidence that the mechanism for the phase transition with increasing electrostatic disorder is the percolation of boundaries separating domains of different Chern number. We construct the network of domain walls using the spectral localizer as a "topological landscape function", and obtain the thermal metal-insulator phase diagram from the percolation transition.
Keywords: topology; spectral localizer; phase transition; disorder; chiral p-wave superconductor