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Applied Physics Letters / Volume 96 / Issue 22 / NANOSCALE SCIENCE AND DESIGN

Appl. Phys. Lett. 96, 223112 (2010); http://dx.doi.org/10.1063/1.3443716 (3 pages)

Approaching ideal weak link behavior with three dimensional aluminum nanobridges

R. Vijay, E. M. Levenson-Falk, D. H. Slichter, and I. Siddiqi

Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA

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(Received 7 May 2010; accepted 12 May 2010; published online 4 June 2010)

We investigate unshunted dc superconducting quantum interference devices (SQUIDs) consisting of aluminum nanobridges of varying length L contacted with (two dimensional, or 2D) and (three dimensional, or 3D) banks. 3D nanobridge SQUIDs with L ≤ 150 nm (approximately four times the superconducting coherence length) exhibit ≈70% critical current modulation with applied magnetic field, approaching the theoretical limit for an ideal short metallic weak link. In contrast, 2D nanobridge SQUIDs exhibit significantly lower critical current modulation. This enhanced nonlinearity makes 3D nanobridge Josephson junctions well suited to optimize sensitivity in weak link SQUID magnetometers as well as realize ultralow-noise amplifiers and qubits.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

aluminium, critical currents, nanotechnology, SQUID magnetometers, superconducting junction devices, superconducting microbridges

PACS

  • 85.25.Dq

    Superconducting quantum interference devices (SQUIDs)

  • 85.25.Cp

    Josephson devices

  • 85.25.-j

    Superconducting devices

  • 74.25.Sv

    Critical currents

  • 74.45.+c

    Proximity effects; Andreev reflection; SN and SNS junctions

  • 07.55.Jg

    Magnetometers for susceptibility, magnetic moment, and magnetization measurements

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3443716

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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    R. Vijay, J. D. Sau, M. L. Cohen, and I. Siddiqi, Phys. Rev. Lett. 103, 087003 (2009).

    W. J. Skocpol, M. R. Beasley, and M. Tinkham, J. Appl. Phys. 45, 4054 (1974)JAPIAU000045000009004054000001.

    K. Hasselbach, D. Mailly, and J. R. Kirtley, J. Appl. Phys. 91, 4432 (2002)JAPIAU000091000007004432000001.


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