A terahertz source from intrinsic Josephson junctions

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  • 固有ジョセフソン接合によるテラヘルツ発振器
  • コユウ ジョセフソン セツゴウ ニ ヨル テラヘルツ ハッシンキ

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Abstract

<p>High-Tc superconducting oxides have layered Perovskite crystal structures. Among these, in highly anisotropic Bi2Sr2CaCu2O8+δ, “superconducting” CuO2 double layers are interleaved with “insulating” SrO-BiO-BiO-SrO layers. Such an alternating layered structure was found to exhibit a “Josephson effect” just by wiring the top and bottom of a single crystal. Namely, a device structure is naturally embedded in the crystals. The fabrication of reliable and uniform Josephson junctions has been a major issue throughout the history of both basic research and the application of superconducting electronics. This is because the interface of the superconductor (metal) and insulator (oxide), namely the heterojunction, does not have “epitaxial relations”. If we use a single crystal of high-Tc oxide, its interface is atomically flat and the thickness of the superconducting and insulating layers is constant throughout the crystal, as has been guaranteed by the translational symmetry. The number of Josephson junctions in a crystal having a thickness of 1μm is as much as 650, which can never be realized by a thin film fabrication technique.</p><p>Furthermore, the energy gap of a high-Tc superconductor is one order larger than that of a conventional metal superconductor (Nb), which results in the generation of a one order higher frequency microwave becoming possible, i. e. from 1THz to 10THz from the enormous number of junctions in the array. Thus, one can expect a powerful THz generation from a Bi2Sr2CaCu2O8+δ single crystal.</p>

Journal

  • Oyo Buturi

    Oyo Buturi 84 (5), 438-443, 2015-05-10

    The Japan Society of Applied Physics

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