PAMBE grown NbTiN-AlN-NbTiN Josephson junction heterostructures for superconducting quantum circuits

ORAL

Abstract

Plasma assisted molecular beam epitaxy (PAMBE) is used to grow niobium titanium nitride alloys (NbxTi1-xN) superconductors and wide bandgap nitride (AlN) trilayers directly on c-plane sapphire wafer. This combination of nitride materials provides sufficient degrees of freedom that synthesis of an epitaxial Josephson junction may be possible. Using a structure first approach to design optimization, the structural, surface topology, bonding, and interface characteristics will be described. Superconducting characteristics including microwave loss and work towards IV transport through Josephson junction devices will be discussed.

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Presenters

  • Christopher Richardson

    • Laboratory for Physical Sciences
    • Laboratory of Physical Sciences
    • Laboratory of Physical Sciences, University of Maryland, College Park

Authors

  • Christopher Richardson

    • Laboratory for Physical Sciences
    • Laboratory of Physical Sciences
    • Laboratory of Physical Sciences, University of Maryland, College Park

  • Austin Thomas

    • Laboratory for Physical Sciences

  • Ashish Alexander

    • Laboratory for Physical Sciences
    • University of Maryland, College Park
    • Laboratory of Physical Sciences, University of Maryland, College Park

  • Christopher Weddle

    • Laboratory for Physical Sciences

  • Alan Kramer

    • Laboratory for Physical Sciences

  • Matthew Olszta

    • Pacific Northwest National Laboratory

  • Bruce Arey

    • Pacific Northwest National Laboratory