Nano-ploughed Josephson Junctions as on-chip Radiation Sources

Details Nano-ploughed Josephson Junctions as on-chip Radiation Sources Nano-ploughed Josephson Junctions as on-chip Radiation Sources

1998-12-09

arxiv.org/abs/cond-mat/9812150v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to appear in the special issue of Superlattices and Microstructures on Mesoscopic Superconductivity (scheduled for May 1999)

Scientific paper

10.1006/spmi.1999.0750

A new technique is presented which enables the fabrication of highly transparent Josephson junctions in combination with mesoscopic devices. We utilize a modified AFM tip to plough grooves into superconducting material, thus defining a weak link. This weak link is made within the superconducting split-gates, which are used to electrostatically form a conventional quantum dot and serves as a source of millimeter wave radiation around 100 GHz. We show the characteristics of typical junctions built and discuss their high-frequency properties. We find that the millimeter wave emission of the weak link leads to a bolometric effect in the case of quantum point contact spectroscopy.

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