Tunnel junction thermometry and thermalisation of electrons

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Pekola, Jukka, Prof.
dc.contributor.author Holmqvist, Tommy
dc.date.accessioned 2012-08-24T07:52:19Z
dc.date.available 2012-08-24T07:52:19Z
dc.date.issued 2010
dc.identifier.isbn 978-952-60-3079-1 (electronic)
dc.identifier.isbn 978-952-60-3078-4 (printed) #8195;
dc.identifier.issn 1795-4584
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/4757
dc.description.abstract In this work, normal metal and superconducting tunnel junctions have been studied. In particular applications in low temperature electronic thermometry are investigated. The double oxidation method for achieving high resistance junctions is described and shown to produce high quality devices. A new invention, the single junction thermometer (SJT), is described, and proof of the concept experiments demonstrating the functionality of the device are described. A key feature of the SJT is a well controlled electromagnetic environment surrounding a single junction. It is shown that embedding a single junction within arrays of other junctions is a superior way for controlling the environment as compared to previously proposed methods. Improved thermalisation of electrons is shown to be beneficial for the performance of superconducting RSFQ (Rapid Single Flux Quantum) devices. The so called grey zone of the most basic of these devices, the balanced comparator, is investigated. Improved performance based on metallic cooling fins has been achieved. In the same spirit improved thermalisation of the Coulomb blockade thermometers extends their operation towards lower temperatures. A method employing thick metallic islands was developed and tested to this end. en
dc.format.extent Verkkokirja (3966 KB, 51 s.)
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Aalto-yliopiston teknillinen korkeakoulu en
dc.relation.ispartofseries TKK dissertations, 215 en
dc.relation.haspart [Publication 1]: A. M. Savin, J. P. Pekola, T. Holmqvist, J. Hassel, L. Grönberg, P. Helistö, and A. Kidiyarova-Shevchenko. 2006. High-resolution superconducting single-flux quantum comparator for sub-Kelvin temperatures. Applied Physics Letters, volume 89, number 13, 133505, 3 pages. en
dc.relation.haspart [Publication 2]: T. Holmqvist, M. Meschke, and J. P. Pekola. 2008. Double oxidation scheme for tunnel junction fabrication. Journal of Vacuum Science and Technology B, volume 26, number 1, pages 28-31. en
dc.relation.haspart [Publication 3]: E. Isosaari, T. Holmqvist, M. Meschke, M. Heinonen, and J. P. Pekola. 2009. Thermometry by micro and nanodevices. The European Physical Journal - Special Topics, volume 172, number 1, pages 323-332. en
dc.relation.haspart [Publication 4]: Jukka P. Pekola, Tommy Holmqvist, and Matthias Meschke. 2008. Primary tunnel junction thermometry. Physical Review Letters, volume 101, number 20, 206801, 4 pages. en
dc.relation.haspart [Publication 5]: Tommy Holmqvist, Jukka P. Pekola, and Matthias Meschke. 2009. Influence of environment on tunneling thermometry. In: Meri Helle (editor). Proceedings of the Conference on Micro- and Nanocryogenics. Espoo, Finland. 3-5 August 2008. Springer. Journal of Low Temperature Physics, volume 154, numbers 5-6, pages 172-178. en
dc.subject.other Physics
dc.title Tunnel junction thermometry and thermalisation of electrons en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Aalto-yliopiston teknillinen korkeakoulu fi
dc.contributor.department O.V. Lounasmaa -laboratorio fi
dc.contributor.department O.V. Lounasmaa Laboratory en
dc.subject.keyword thermometry en
dc.subject.keyword Coulomb blockade thermometer en
dc.subject.keyword single junction thermometer en
dc.subject.keyword tunnel junctions en
dc.identifier.urn URN:ISBN:978-952-60-3079-1
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.supervisor Kaivola, Matti, Prof.

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