Nanoscale superconducting quantum interference devices are fabricated in-situ from a single Bi_0.26Sb_1.74Te_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. [...]

We report on the investigation of periodic superstructures in twisted bilayer graphene (tBLG) van der Waals heterostructures, where one of the graphene layers is aligned to hexagonal boron nitride (hBN). Our theoretical simulations reveal that if the ratio of the resulting two moiré unit-cell areas is a simple fraction, the graphene/hBN moiré lattice acts as a staggered potential, breaking the degeneracy between tBLG AA sites. [...]

With increasing attention in Majorana physics for possible quantum bit applications, a large interest has been developed to understand the properties of the interface between an s-type superconductor and a topological insulator. Up to this point the interface analysis was mainly focused on in situ prepared Josephson junctions, which consist of two coupled single interfaces or to ex situ fabricated single interface devices. [...]