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Insulating, metallic-like and superconducting phase in single nanowires

4 Febbraio 2020 15:00 - 16:30
14 - 15 IV piano St. 9
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Physikalisches Institut, Karlsruher Institut f?r Technologie, 76131 Karlsruhe, Germany
Area di Ricerca
Superconduttivita', Sistemi fortemente correlati, Eterostrutture e loro applicazioni

Lithographically fabricated nanowires are a promising alternative to Josephson tunnel junctions as a nonlinear element in superconducting quantum circuits. They potentially offer low intrinsic loss, a high impedance, and simple fabrication. In the superconducting regime, a key requirement for these wires is a high kinetic inductance stemming from a low normal state conductance. We study single high ohmic nanowires made from disordered oxidised (granular) aluminium with a new technique, which allows us to alter the wire resistance in situ by two orders of magnitude. We present low temperature measurements of the microwave coherence as well as transport properties, where we observe a coulomb-blockaded (insulating), metallic-like and a superconducting regime.


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