Quantum interference device made by DNA templating of superconducting nanowires.
The application of single molecules as templates for nanodevices is a promising direction for nanotechnology. We used a pair of suspended DNA molecules as templates for superconducting two-nanowire devices. Because the resulting wires are very thin, comparable to the DNA molecules themselves, they are susceptible to thermal fluctuations typical for one-dimensional superconductors and exhibit a nonzero resistance over a broad temperature range. We observed resistance oscillations in these two-nanowire structures that are different from the usual Little-Parks oscillations. Here, we provide a quantitative explanation for the observed quantum interference phenomenon, which takes into account strong phase gradients created in the leads by the applied magnetic field.
Hopkins
David S
DS
Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Pekker
David
D
Goldbart
Paul M
PM
Bezryadin
Alexey
A
D000497:Alloys; D004247:DNA; D004553:Electric Conductivity; D017097:Electric Impedance; D005857:Germanium; D008280:Magnetics; D008433:Mathematics; D008670:Metals; D008982:Molybdenum; D049329:Nanostructures; D036103:Nanotechnology; D013816:Thermodynamics
D000497:Alloys; D008670:Metals; D005857:Germanium; D008982:Molybdenum; D004247:DNA