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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