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TT: Fachverband Tiefe Temperaturen

TT 15: Topology: Majorana Physics

TT 15.4: Vortrag

Montag, 9. März 2026, 15:45–16:00, HSZ/0105

Experiments on hybrid topological insulator superconductor nanostructures — •Jakob Schluck, Ella Nikodem, and Yoichi Ando — Institute of Physics II, University of Cologne

Hybrid structures of topological insulators and conventional s-wave superconductors are predicted to generate topological superconductivity, which can host Majorana zero modes [1]. These quasiparticle excitations display non-Abelian exchange statistics and hold great potential for quantum computation [2]. Recently, we studied for the first time the phase-tunable density of states in topological insulator Josephson junctions via tunneling measurements [3]. The periodic gap closing and reopening can be interpreted as a signature of a topological phase transition. Furthermore, we established a new platform for experiments on topological superconductivity, the topological nano-SQUID [4]. By contacting top and bottom surface of the topological insulator simultaneously, we realize a scenario, where an in-plane magnetic field is sufficient to reliably reach the topological regime. In my talk, I will focus on the ongoing experimental efforts building on these achievements.
[1] L. Fu and C. L. Kane, Phys. Rev. Lett. 100 (2008) 096407
[2] C. Nayak et al., Rev. Mod. Phys. 80 (2008) 1083
[3] J. Schluck et al., arXiv:2406.08265v2
[4] E. Nikodem et al., arXiv:2412.07993v3

Keywords: Topological Insulators; Topological Superconductivity; Majorana Zero Modes; Josephson Junctions; Tunneling Spectroscopy