Material systems with strongly correlated electrons have been found to exhibit a wide range of properties, such as superconductivity, various magnetic phases, and metal to insulator transitions. These properties have been further expanded by the ability to grow these materials in heterostructures where the interfaces often exhibit states not seen in the bulk material, including 2-D electron gases such as those seen at the LAO/STO interface. Currently the group is working on understanding the properties and interfaces of the rare earth nickelate (RNiO3) family of materials, which in the bulk have a metal to insulator transition.
Oxides often make good dielectric materials and the Martinis group at UCSB makes use of sapphire in constructing superconducting resonators for use in quantum computing as qubits. Coherence times of the resonators is heavily influenced by the Al/Sapphire interface, and two level states that may be present, we are studying ways to increase qubit coherence lifetimes by identifying possible defects at the interface and ways to improve the sapphire/Al interface using our in-situ growth and characterization equipment.