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TT: Fachverband Tiefe Temperaturen

TT 15: Topology: Majorana Physics

TT 15.6: Vortrag

Montag, 9. März 2026, 16:15–16:30, HSZ/0105

Towards microwave measurements of topological insulator nano-SQUID devices — •Jorge Esteban Bolio, Lucas Marten Janssen, Ella Nikodem, Jakob Schluck, Christian Dickel, and Yoichi Ando — Physics Institute II, University of Cologne, Zülpicher Str. 77, 50937 Köln, Germany

A topological insulator (TI) nanowire side contacted by superconducting leads gives rise to a TI nano-SQUID formed by the two parallel S-N-S Josephson junctions of the top and bottom surface. This platform is expected to exhibit a robust topological phase. While DC measurements in this platform have been performed [1,2], microwave measurements can also illuminate the junction quality and open a path for fast and robust detection of Majorana zero-modes (MZMs) [3]. We describe the integration of the TI nano-SQUID into a 3D transmon setup, and report our progress in the development of a dual nano-SQUID device where the overlap between two MZMs could be gate controlled.
[1] Nikodem et al. arXiv:2412.07993 (2024)
[2] Nikodem et al. Sci. Adv. 11 (2025) eadw4898
[3] E. Ginossar & E. Grosfeld, Nat. Commun. 5 (2014) 4772

Keywords: Topological insulators; Superconductivity; Microwaves; Majoranas