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TT: Fachverband Tiefe Temperaturen

TT 89: Focus Session: Evolution of Topological Materials into Superconducting Nanodevices (joint session HL/TT)

TT 89.2: Hauptvortrag

Freitag, 22. März 2024, 10:00–10:30, EW 202

Robust Majorana modes in topological material-based nanoelectronic hybrid devices — •Kristof Moors — Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Germany — JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University, Germany

Majorana modes have the potential to be used as robust carriers of quantum information for future fault-tolerant quantum information processing applications. While their realization in various condensed matter systems is well understood in principle, realistic conditions (with, e.g., disorder or imperfections) can complicate their formation as well as experimental verification in practice. I will present recent modeling and simulation results on two promising platforms for Majorana devices: magnetic and nonmagnetic topological insulator nanoribbons with proximity-induced superconductivity, respectively. These platforms have distinct advantages for a robust realization of Majorana modes by forming them out of their proximitized and topologically protected surface or edge states. In this way, a higher tolerance with respect to disorder and less finetuned conditions can be obtained as compared to alternative platforms. I will discuss the topological phase with well-separated Majorana modes in such systems under realistic conditions, the robustness against disorder, and distinct signatures in spectroscopy and transport experiments. I will also comment on the latest status regarding the experimental development.

Keywords: topological insulators; topological superconductivity; Majorana modes; Dirac surface states; quantum anomalous Hall