Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session H71: Poster Session I (2:00pm - 4:00pm)
2:00 PM,
Tuesday, March 16, 2021
Abstract: H71.00017 : Design and Construction of Electronics for Measuring Superconducting-to-Normal State Switching Statistics of a Josephson junction*
Presenter:
Erik Cauley
(University of the Sciences)
Authors:
Erik Cauley
(University of the Sciences)
Keeran Ramanathan
(University of the Sciences)
Dan Fauni
(University of the Sciences)
Roberto Ramos
(University of the Sciences)
Escape of a Josephson phase particle from the zero-voltage state of a current-biased, hysteretic Josephson junction has been studied experimentally, in agreement with Kramers theory for the escape of a Brownian particle from a potential well. The dynamics of the junction is analogous to that of a phase particle confined to a one-dimensional, tilted cosine potential or washboard potential where the coordinate is the phase difference between the order parameter on either side of the tunnel barrier. The effect has been investigated in Josephson junctions based on single-gap superconductors such as Al and Nb, high-Tc superconductors, and multi-gap superconductors such as MgB2. We report on progress in designing and building electronics that allows physics undergraduates to perform similar experiments using a 2 Kelvin cryocooler. The electronics consist of current ramp and a Schmidt trigger detection circuit that amplifies and measures the switching of voltage of a Josephson junction, and a universal time interval counter to measure switching statistics, which is plotted on a switching histogram.
*R.C.R. acknowledges support from the Charles Kaufman Foundation and the assistance of the Lobb-Wellstood Research Group at the Maryland Quantum Materials Center of the University of Maryland.
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