Anomalous modulation of Josephson radiation in nanowire-based Josephson junctions

被引：14
|
作者：
Kamata, H. [1 ,2 ]
Deacon, R. S. [1 ,3 ]
Matsuo, S. [2 ]
Li, K. [4 ,5 ]
Jeppesen, S. [6 ]
Samuelson, L. [6 ]
Xu, H. Q. [4 ,5 ,6 ]
Ishibashi, K. [1 ,3 ]
Tarucha, S. [1 ,2 ]
机构：
[1] RIKEN, Ctr Emergent Matter Sci, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
[2] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan
[3] RIKEN, Adv Device Lab, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
[4] Peking Univ, Beijing Key Lab Quantum Devices, Key Lab Phys & Chem Nanodevices, Beijing 100871, Peoples R China
[5] Peking Univ, Dept Elect, Beijing 100871, Peoples R China
[6] Lund Univ, Div Solid State Phys, Box 118, SE-22100 Lund, Sweden
来源：
PHYSICAL REVIEW B | 2018年 / 98卷 / 04期
基金：
瑞典研究理事会; 中国国家自然科学基金;
关键词：
BIAS CONDUCTANCE PEAK; MAJORANA FERMIONS; TOPOLOGICAL SUPERCONDUCTOR; HYBRID DEVICE; SUPERCURRENT; SIGNATURE; STATE;
D O I：
10.1103/PhysRevB.98.041302
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 similar to 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.
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页数：5
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