Phase escape of current-biased Josephson junctions |
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Authors: | Cao Wen-Hui Yu Hai-Feng Tian Ye Chen Geng-Hua and Zhao Shi-Ping |
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Affiliation: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract: | Switching current distributions of an Nb/Al--AlO$_x$/Nb
Josephson junction are measured in a temperature range from 25~mK to
800~mK. We analyse the phase escape properties by using the theory
of Larkin and Ovchinnikov (LO) which takes discrete energy levels
into account. Our results show that the phase escape can be well
described by the LO approach for temperatures near and below the
crossover from thermal activation to macroscopic quantum tunneling.
These results are helpful for further study of macroscopic quantum
phenomena in Josephson junctions where discrete energy levels need
to be considered. |
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Keywords: | Nb junctions phase escapes macroscopic quantum
phenomena discrete energy levels |
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