Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

Measurement of superconducting phase gradients using a DNA-templated nanowire interference device

David Hopkins, David Pekker, Paul M. Goldbart, Alexey Bezryadin

Published Mar 13, 2006• 0 citations
OpenAlex

Related papers

Instrumentation using quantum interference in superconductors

James Edward Zimmerman

•Aug 16, 1965•1 citation

Measurements of superconducting phase gradients by a nanowire quantum interference device templated by DNA molecules

David Hopkins

Previously employed wet-chemistry approaches to DNA metallization from granular wires that become highly resistive at low temperatures. We have developed a process to make superconducting nanowires templated by DNA molecules that are homogeneous, are less than 10 nm in diameter, make seamless contacts the leads, and become superconducting at low temperatures. Our method involves isolating single DNA strands stretched across a narrow but deep trench and sputter-coating MoGe on the DNA scaffold. We have used these nanowires as the basis for a quantum interference device in which two wires are connected in parallel by superconducting films. We have discovered resistance oscillations for the two-wire device as a function of phase gradients in the leads caused by magnetic screening currents or applied currents, and we have developed a theory to explain our observations based on an extension of the Langer- Ambegaokar-McCumber-Halperin theory of thermally activated phase slips. In addition, we also measure the effect of vortex motions on these oscillations and confirm the field dependence of the Campbell penetration depth.

•Jul 1, 2006•1 citation

Nanoscale wireframe SQUID on a cantilever by corner lithography

Anonymous, Tim Horstink, Melissa J. Goodwin +5 more

We present the fabrication of nanoscale superconducting quantum interference devices (SQUIDs) at the apex of wireframe tips on self-aligned superconducting cantilever probes. The probes are made on silicon wafers using molding techniques in combination with corner lithography, which results in a nanowire frame tip with a tunable apex structure. A shadow-effect deposition using magnetron sputtering of niobium creates self-aligned superconducting wireframes on cantilevers with accompanying device circuitry. Superconducting weak links are realized at the apex of the wireframes with the use of focused ion beam nanopatterning. The realized SQUIDs have effective diameters ranging from several micrometers down to 100 nm and can be operated in magnetic fields up to 1 T. Furthermore, the nanowires in the wireframe can be used to flux modulate the SQUID locally. This fabrication process enables the production of wafer-scale templates for probes based on on-tip superconducting devices.

arXiv:2601.11331•Physical Review Applied•Aug 28, 2026•0 citations

Superconducting Quantum Interference Devices for Low Frequency Measurements

John L. Clarke

Springer eBooks•Jan 1, 1977•57 citations

Analytical results of the Fokker–Planck equation derived for one superconducting nanowire quantum interference device and for DC SQUID: symmetric devices

Mohammad Ali Shahzamanian, Mohammad Eatesami, H. Yavary

We consider a symmetric two-junction superconducting quantum interference device, whose junctions are assumed to be overdamped, and consider the sin Fourier series for their current–phase relations. We take into account the effects of thermal fluctuations by forming a two-dimensional Fokker–Planck equation for the distribution function. We judge a series expansion of first order with respect to the components of the reduced inductance for the distribution function and obtain relations for current–voltage and the circulating current. We consider the measured resistance of the superconducting nanowire quantum interference device with mesoscopic leads that Hopkins et al reported in Hopkins et al (2005 Science 308 1762) and Pekker et al (2005 Phys. Rev. B 72 104517), by defining the loop inductance, and by considering appropriate relations for the resistance of nanowires. In fact, we extend the Chesca formulation (Chesca 1998 J. Low Temp. Phys. 112 165) and give a unification formulation for symmetric nanowire two-junction devices, low and high Tc DC superconducting quantum interference devices (SQUIDs) in restricted conditions.

Superconductor Science and Technology•Jun 4, 2007•5 citations

Nano superconducting quantum interference devices for nanoscale applications

Carmine Granata, N. De Leo, E. Esposito +5 more

•Jan 1, 2019•0 citations
Previously employed wet-chemistry approaches to DNA metallization from granular wires that become highly resistive at low temperatures. We have developed a process to make superconducting nanowires templated by DNA molecules that are homogeneous, are less than 10 nm in diameter, make seamless contacts the leads, and become superconducting at low temperatures. Our method involves isolating single DNA strands stretched across a narrow but deep trench and sputter-coating MoGe on the DNA scaffold. We have used these nanowires as the basis for a quantum interference device in which two wires are connected in parallel by superconducting films. We have discovered resistance oscillations for the two-wire device as a function of phase gradients in the leads caused by magnetic screening currents or applied currents, and we have developed a theory to explain our observations based on an extension of the Langer- Ambegaokar-McCumber-Halperin theory of thermally activated phase slips. In addition, we also measure the effect of vortex motions on these oscillations and confirm the field dependence of the Campbell penetration depth.
We present the fabrication of nanoscale superconducting quantum interference devices (SQUIDs) at the apex of wireframe tips on self-aligned superconducting cantilever probes. The probes are made on silicon wafers using molding techniques in combination with corner lithography, which results in a nanowire frame tip with a tunable apex structure. A shadow-effect deposition using magnetron sputtering of niobium creates self-aligned superconducting wireframes on cantilevers with accompanying device circuitry. Superconducting weak links are realized at the apex of the wireframes with the use of focused ion beam nanopatterning. The realized SQUIDs have effective diameters ranging from several micrometers down to 100 nm and can be operated in magnetic fields up to 1 T. Furthermore, the nanowires in the wireframe can be used to flux modulate the SQUID locally. This fabrication process enables the production of wafer-scale templates for probes based on on-tip superconducting devices.
We consider a symmetric two-junction superconducting quantum interference device, whose junctions are assumed to be overdamped, and consider the sin Fourier series for their current–phase relations. We take into account the effects of thermal fluctuations by forming a two-dimensional Fokker–Planck equation for the distribution function. We judge a series expansion of first order with respect to the components of the reduced inductance for the distribution function and obtain relations for current–voltage and the circulating current. We consider the measured resistance of the superconducting nanowire quantum interference device with mesoscopic leads that Hopkins et al reported in Hopkins et al (2005 Science 308 1762) and Pekker et al (2005 Phys. Rev. B 72 104517), by defining the loop inductance, and by considering appropriate relations for the resistance of nanowires. In fact, we extend the Chesca formulation (Chesca 1998 J. Low Temp. Phys. 112 165) and give a unification formulation for symmetric nanowire two-junction devices, low and high Tc DC superconducting quantum interference devices (SQUIDs) in restricted conditions.