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首页> 外文期刊>Physical review >Interaction of hot spots and terahertz waves in Bi_2Sr_2CaCu_2O_8 intrinsic Josephson junction stacks of various geometry
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Interaction of hot spots and terahertz waves in Bi_2Sr_2CaCu_2O_8 intrinsic Josephson junction stacks of various geometry

机译:Bi_2Sr_2CaCu_2O_8本征约瑟夫森结堆叠中热点和太赫兹波的相互作用

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摘要

At high enough input power in stacks of Bi_2Sr_2CaCu_2Og intrinsic Josephson junctions a hot spot (a region heated to above the superconducting transition temperature) coexists with regions being still in the superconducting state. In the "cold" regions cavity resonances can occur, synchronizing the ac Josephson currents and giving rise to strong and stable coherent terahertz (THz) emission. We investigate the interplay of hot spots and standing electromagnetic waves by low-temperature scanning laser microscopy and THz emission measurements, using stacks of various geometries. Standing electromagnetic wave patterns and THz emission are observed for a disk-shaped sample. The growth of a hot spot with increasing input power is monitored by small detector junctions surrounding a large rectangular mesa. For two rectangular mesas equipped with two current injectors and one arrow-shaped structure we show that the standing wave can be turned on and off in various regions of the stack structure, depending on the hot-spot position. The results support the picture of the hot spot acting as a reflective termination of the cavity, formed by the cold part of the mesa.
机译:在Bi_2Sr_2CaCu_2Og本征约瑟夫森结的堆栈中具有足够高的输入功率时,热点(加热到超导转变温度以上的区域)与仍处于超导状态的区域共存。在“冷”区域中可能会发生腔共振,从而使交流约瑟夫森电流同步,并产生强而稳定的相干太赫兹(THz)发射。我们使用各种几何形状的堆栈,通过低温扫描激光显微镜和太赫兹发射测量来研究热点和电磁波之间的相互作用。对于圆盘状的样品,观察到驻波电磁波模式和THz发射。输入功率增加时热点的增长由围绕大型矩形台面的小型检测器交界处进行监控。对于配备有两个电流注入器和一个箭头形结构的两个矩形台面,我们显示了根据热点位置可以在堆栈结构的各个区域中打开和关闭驻波。结果支持了热点的图像,热点是由台面的冷部分形成的空腔的反射端接。

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  • 来源
    《Physical review》 |2010年第21期|p.214506.1-214506.10|共10页
  • 作者单位

    Physikalisches Institut, Experimentalphysik II and Center for Collective Quantum Phenomena, Universitdt Tubingen, Auf derMorgenstelle 14, D-72076 Tubingen, Germany;

    Physikalisches Institut, Experimentalphysik II and Center for Collective Quantum Phenomena, Universitdt Tubingen, Auf derMorgenstelle 14, D-72076 Tubingen, Germany;

    Physikalisches Institut, Experimentalphysik II and Center for Collective Quantum Phenomena, Universitdt Tubingen, Auf derMorgenstelle 14, D-72076 Tubingen, Germany;

    National Institute for Materials Science, Tsukuba 3050047, Japan;

    Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093, China;

    Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093, China;

    Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093, China;

    National Institute for Materials Science, Tsukuba 3050047, Japan;

    Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093, China;

    National Institute for Materials Science, Tsukuba 3050047, Japan;

    The Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel;

    Physikalisches Institut, Experimentalphysik II and Center for Collective Quantum Phenomena, Universitdt Tubingen, Auf derMorgenstelle 14, D-72076 Tubingen, Germany;

    Physikalisches Institut, Experimentalphysik II and Center for Collective Quantum Phenomena, Universitdt Tubingen, Auf derMorgenstelle 14, D-72076 Tubingen, Germany;

    National Institute for Materials Science, Tsukuba 3050047, Japan;

    Physikalisches Institut, Experimentalphysik II and Center for Collective Quantum Phenomena, Universitdt Tubingen, Auf derMorgenstelle 14, D-72076 Tubingen, Germany;

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  • 正文语种 eng
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  • 关键词

    tunneling phenomena; point contacts, weak links, josephson effects; cuprate superconductors (high-Tc and insulating parent compounds); josephson devices;

    机译:隧道现象;点接触;弱连接;约瑟夫森效应;铜化超导体(高Tc和绝缘母体化合物);约瑟夫森器件;

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