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Josephson emission with frequency span 1-11 THz from small Bi2Sr2CaCu2O8+delta mesa structures
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Number of Authors: 22017 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 8, article id 1742Article in journal (Refereed) Published
Abstract [en]

Mesa structures made of Bi2Sr2CaCu2O8+delta high-temperature superconductor represent stacks of atomic scale intrinsic Josephson junctions. They can be used for generation of high-frequency electromagnetic waves. Here we analyze Josephson emission from small-but-high mesas (with a small area, but containing many stacked junctions). We have found strong evidence for tunable terahertz emission with a good efficacy in a record high-frequency span 1-11 THz, approaching the theoretical upper limit for this superconductor. Emission maxima correspond to in-phase cavity modes in the mesas, indicating coherent superradiant nature of the emission. We conclude that terahertz emission requires a threshold number of junctions N similar to 100. The threshold behavior is not present in the classical description of stacked Josephson junctions and suggests importance of laser-like cascade amplification of the photon number in the cavity.

Place, publisher, year, edition, pages
2017. Vol. 8, article id 1742
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-149974DOI: 10.1038/s41467-017-01888-4ISI: 000416229300028OAI: oai:DiVA.org:su-149974DiVA, id: diva2:1169665
Available from: 2017-12-29 Created: 2017-12-29 Last updated: 2017-12-29Bibliographically approved

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Borodianskyi, Evgenii A.Krasnov, Vladimir M.
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