Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures

E. A. Borodianskyi and V. M. Krasnov ()
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E. A. Borodianskyi: Stockholm University, AlbaNova University Center
V. M. Krasnov: Stockholm University, AlbaNova University Center

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Mesa structures made of Bi2Sr2CaCu2O8+δ 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 ~ 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.

Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01888-4

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DOI: 10.1038/s41467-017-01888-4

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