Irmer, B. and Simmel, F. and Blick, Robert H. and Lorenz, H. and Kotthaus, J .P. and Bichler, Max and Wegscheider, Werner (1999) Nano-ploughed Josephson junctions as on-chip radiation sources. Superlattices and Microstructures 25 (5-6), pp. 785-795.
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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.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
|Keywords:||mesoscopics; quantum dots; Josephson junctions|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||30 Nov 2009 13:12|
|Last Modified:||20 Jul 2011 22:08|