Anomalous modulation of Josephson radiation in nanowire-based Josephson junctions
Anomalous modulation of Josephson radiation in nanowire-based Josephson junctions
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DOI：
10.1103/physrevb.98.041302
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发表时间：
2018-05
影响因子：
3.7
通讯作者：
H. Kamata;R. Deacon;S. Matsuo;Kan Li;S. Jeppesen;L. Samuelson;Hongqi Xu;K. Ishibashi;S. Tarucha
中科院分区：
文献类型：
--
作者：
H. Kamata;R. Deacon;S. Matsuo;Kan Li;S. Jeppesen;L. Samuelson;Hongqi Xu;K. Ishibashi;S. Tarucha
研究了平行磁场中纳米线约瑟夫森结的约瑟夫森辐射。由InAs NW与超导Al引线制成的Josephson结显示出在零磁场下在4-8 GHz范围内遵循Josephson频率的发射光谱。我们观察到一个明显的偏差的发射光谱从约瑟夫森频率，这是伴随着一个强烈的增强以上的磁场的开关电流为1.300 mT。所观察到的调制可以被理解为反映了受所施加的磁场强烈影响的设备周围的超导电路中的微小变化。我们的研究结果将提供一种方法来准确地调查在NW为基础的系统的拓扑性质。（减）
We investigate the Josephson radiation of nanowire (NW)-based Josephson junctions in a parallel magnetic field. The Josephson junction made of an InAs NW with superconducting Al leads shows the emission spectra which follow the Josephson frequency over the range 4-8 GHz at zero magnetic field. We observe an apparent deviation of the emission spectra from the Josephson frequency which is accompanied by a strong enhancement of the switching current above a magnetic field of ∼300 mT. The observed modulations can be understood to reflect trivial changes in the superconducting circuit surrounding the device which is strongly affected by the applied magnetic field. Our findings will provide a way to accurately investigate topological properties in NW-based systems. (Less)