Nanoscale superconducting quantum interference devices (SQUIDs) are fabricated in-situ from a single Bi0.26Sb1.74Te₃ 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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Zimmermann et al. (2024) studied this question.
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