Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 95: Fe-based Superconductors
TT 95.4: Talk
Friday, March 13, 2026, 10:15–10:30, HSZ/0103
Coupling of Vortex Bound States as a Probe of Majorana Physics in Iron-Based Superconductors — •Raigo Nagashima1, Iksu Jang1, and Jörg Schmalian1,2 — 1Institute for Theoretical Condensed Matter Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 2Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
Motivated by the widespread observation of zero or near-zero vortex bound states on the surfaces of FeSe1−xTex and related iron-based superconductors, we investigate how these states evolve and interact as the magnetic-field-induced vortex density increases. Such coupling effects provide a powerful diagnostic of the underlying nature of the bound states. We compare the behavior expected for conventional Caroli-de Gennes-Matricon (CdGM) vortex states with that arising from Majorana zero modes in two-dimensional topological superconductors. To this end, we analyze the multi-vortex problem in the Fu-Kane model and compute the resulting hybridized bound-state wave functions. Our results reveal striking and qualitative differences between the coupling patterns of CdGM states and those of Majorana modes, demonstrating that the field-induced evolution of vortex bound states offers a clear and experimentally accessible fingerprint for identifying Majorana physics in iron-based superconductors.
Keywords: Majorana zero modes; Superconducting vortex; Vortex bound state