Nano-ploughed Josephson junctions as on-chip radiation sources
✍ Scribed by B. Irmer; F. Simmel; R.H. Blick; H. Lorenz; J.P. Kotthaus; M. Bichler; W. Wegscheider
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 631 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0749-6036
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✦ Synopsis
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 highfrequency 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.