Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session S27: Superconductivity:Devices & Materials-I
8:00 AM–11:00 AM,
Thursday, March 9, 2023
Room: Room 219
Sponsoring
Unit:
DCMP
Chair: Hong-Yi Xie, University of Oklahoma
Abstract: S27.00007 : Tunable Superconductor Insulator Transition in a Quantum Phase Slip Interference Device
9:12 AM–9:24 AM
Presenter:
Jan Nicolas Voss
(Karlsruhe Institute of Technology)
Authors:
Jan Nicolas Voss
(Karlsruhe Institute of Technology)
Micha Wildermuth
(Karlsruhe Institute of Technology)
Maximilian Kristen
(Karlsruhe Institute of Technology)
Hannes Rotzinger
(Karlsruhe Institute of Technology)
Alexey V Ustinov
(Karlsruhe Institute of Technology)
We present a realization of a quantum phase slip interferometer based on two strongly coupled granular aluminum nanowires connected in series. In the experiment, the interference is controlled by a gate voltage and manifests as a periodic modulation of the critical Coulomb blockade voltage. Our data show that the modulation amplitude depends on the homogeneity of the wires. To improve the wire homogeneity, we employ the intrinsic electromigration technique ([1]) which allows to adjust the resistances and thus the Coulomb blockade of the individual wires. We observe a strong destructive interference of quantum phase slips, displaying a transition from the insulating to a superconducting state. The circuit is analyzed in detail and future applications are proposed.
[1] J. N. Voss, Y. Schön, M. Wildermuth, D. Dorer, J. H. Cole, H. Rotzinger and A. V. Ustinov, ACS Nano 15 (2021)
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