Chin. Phys. Lett.  2015, Vol. 32 Issue (4): 047402    DOI: 10.1088/0256-307X/32/4/047402
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Dependence of Switching Current Distribution of a Current-Biased Josephson Junction on Microwave Frequency
ZHAI Ji-Quan, LI Yong-Chao, SHI Jian-Xin, ZHOU Yu, LI Xiao-Hu, XU Wei-Wei**, SUN Guo-Zhu**, WU Pei-Heng
Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093
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ZHAI Ji-Quan, LI Yong-Chao, SHI Jian-Xin et al  2015 Chin. Phys. Lett. 32 047402
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Abstract We investigate the distribution of the switching current of a current-biased Josephson junction (CBJJ) and its dependence on the microwave frequency using two theoretical methods, one of which is the quantum trajectory method and the other is the master equation method. Both the methods show that the distribution of the switching current of CBJJ will exhibit double peaks in a certain range of microwave frequency if proper microwave power is given, and the gap between the two peaks will increase with the microwave frequency. The obtained results can be used to identify the energy difference of the ground and first excited states in a Josephson junction for any bias current.
Received: 19 January 2015      Published: 30 April 2015
PACS:  74.50.+r (Tunneling phenomena; Josephson effects)  
  03.65.Sq (Semiclassical theories and applications)  
  05.45.-a (Nonlinear dynamics and chaos)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/32/4/047402       OR      https://cpl.iphy.ac.cn/Y2015/V32/I4/047402
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ZHAI Ji-Quan
LI Yong-Chao
SHI Jian-Xin
ZHOU Yu
LI Xiao-Hu
XU Wei-Wei
SUN Guo-Zhu
WU Pei-Heng
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