Affiliation:
1. Department of Physics, University of Maryland 1 , College Park, Maryland 20742, USA
2. École Polytechnique Fédérale de Lausanne (EPFL) 2 , Lausanne CH-1015, Switzerland
Abstract
It is customary to use arrays of superconducting quantum interference devices (SQUIDs) for implementing magnetic field-tunable inductors. Here, we demonstrate an equivalent tunability in a (SQUID-free) array of single Al/AlOx/Al Josephson tunnel junctions. With the proper choice of junction geometry, a perpendicularly applied magnetic field bends along the plane of the superconductor and focuses into the tunnel barrier region due to a demagnetization effect. Consequently, the Josephson inductance can be efficiently modulated by the Fraunhofer-type supercurrent interference. The elimination of SQUIDs not only simplifies the device design and fabrication but also facilitates a denser packing of junctions, and, hence, a higher inductance per unit length. As an example, we demonstrate a transmission line, the characteristic impedance of which is field-tuned in the range of 4–8 kΩ, centered around the important value of the resistance quantum h/(2e)2≈6.5 kΩ.
Funder
U.S. Department of Energy
United States - Israel Binational Science Foundation
Subject
Physics and Astronomy (miscellaneous)
Cited by
2 articles.
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