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Nano-ploughed Josephson Junctions as on-chip Radiation Sources

B. Irmer·F. Simmel·R. H. Blick·H. Lorenz·J. P. Kotthaus·M. Bichler·W. Wegscheider
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Abstract

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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B. Irmer, F. Simmel, R. H. Blick, H. Lorenz, J. P. Kotthaus, M. Bichler, W. Wegscheider. 1998-12-09. Nano-ploughed Josephson Junctions as on-chip Radiation Sources. https://doi.org/10.1006/spmi.1999.0750

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