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

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  • E. A. Borodianskyi

    (Stockholm University, AlbaNova University Center)

  • V. M. Krasnov

    (Stockholm University, AlbaNova University Center)

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.

Suggested Citation

  • E. A. Borodianskyi & V. M. Krasnov, 2017. "Josephson emission with frequency span 1–11 THz from small Bi2Sr2CaCu2O8+δ mesa structures," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01888-4
    DOI: 10.1038/s41467-017-01888-4
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    Cited by:

    1. Taras Golod & Vladimir M. Krasnov, 2022. "Demonstration of a superconducting diode-with-memory, operational at zero magnetic field with switchable nonreciprocity," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    2. Taras Golod & Lise Morlet-Decarnin & Vladimir M. Krasnov, 2023. "Word and bit line operation of a 1 × 1 μm2 superconducting vortex-based memory," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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