Condensed Matter seminar: "Patterning Superconductivity in a Topological Insulator"

Nina Marković, Goucher College
- | David Rittenhouse Laboratory, A4

Topologically protected states in combination
with superconductivity hold promise for quantum
computing applications, but the progress on electrical
transport measurements in such systems has been impeded by the difficulty of obtaining devices with reliable electrical
contacts and fabricating circuits. We find that superconductivity can be patterned
directly into Bi2Se3 nanostructures by local doping with
palladium. Superconducting regions are defined by depositing
palladium on top of the nanostructures using electron beam
lithography followed by in situ annealing. Electrical transport
measurements at low temperatures show either partial or full superconducting transition, depending on the doping conditions. Structural characterization techniques indicate that palladium remains localized in the targeted areas, making it possible to pattern superconducting circuits of arbitrary shapes in this topological material.