Epitaxial topological heterostructures of (Bi,Sb)2Te3/graphene/gallium have been achieved using molecular-beam epitaxy, providing the opportunity to access Majorana zero modes in electrical transport when combined with van der Waals tunnel junctions.
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Xiu, F. Atomic heteroepitaxy for topological superconductivity. Nat. Mater. 22, 538–539 (2023). https://doi.org/10.1038/s41563-023-01533-0