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Topological insulator based axial superconducting quantum interferometer structures

Erik Zimmermann, Abdur Rehman Jalil, Michael Schleenvoigt, Jan Karthein, Benedikt Frohn, Gerrit Behner, Florian Lentz, Stefan Trellenkamp et al.

JuSER (Forschungszentrum Jülich), 2024

Abstract

Nanoscale superconducting quantum interference devices (SQUIDs) are fabricated in-situ from a single Bi$_{0.26}$Sb$_{1.74}$Te$_{3}$ nanoribbon that is defined using selective-area growth and contacted with superconducting Nb electrodes via a shadow mask technique. We present $h/(2e)$ magnetic flux periodic interference in both, fully and non-fully proximitized nanoribbons. The pronounced oscillations are explained by interference effects of coherent transport through topological surface states surrounding the cross-section of the nanoribbon.

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