Influence of the current‐phase relation on the critical‐current‐applied‐magnetic‐flux dependence in parallel‐connected Josephson junctions

1976 ◽  
Vol 47 (6) ◽  
pp. 2656-2661 ◽  
Author(s):  
Won‐Tien Tsang ◽  
T. Van Duzer
2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Francesco M. D. Pellegrino ◽  
Giuseppe Falci ◽  
Elisabetta Paladino

AbstractShort ballistic graphene Josephson junctions sustain superconducting current with a non-sinusoidal current-phase relation up to a critical current threshold. The current-phase relation, arising from proximitized superconductivity, is gate-voltage tunable and exhibits peculiar skewness observed in high quality graphene superconductors heterostructures with clean interfaces. These properties make graphene Josephson junctions promising sensitive quantum probes of microscopic fluctuations underlying transport in two-dimensions. We show that the power spectrum of the critical current fluctuations has a characteristic $$1/f$$1∕f dependence on frequency, $$f$$f, probing two points and higher correlations of carrier density fluctuations of the graphene channel induced by carrier traps in the nearby substrate. Tunability with the Fermi level, close to and far from the charge neutrality point, and temperature dependence of the noise amplitude are clear fingerprints of the underlying material-inherent processes. Our results suggest a roadmap for the analysis of decoherence sources in the implementation of coherent devices by hybrid nanostructures.


2016 ◽  
Vol 94 (11) ◽  
Author(s):  
C. D. English ◽  
D. R. Hamilton ◽  
C. Chialvo ◽  
I. C. Moraru ◽  
N. Mason ◽  
...  

2011 ◽  
Vol 25 (02) ◽  
pp. 131-140 ◽  
Author(s):  
YAN-HUA LIAO ◽  
JIAN LI ◽  
FENG WANG

By taking into account the interface scattering effect in a d-wave superconductor (S)/insulator layer (I)/d-wave superconductor (S) junction, the temperature dependence of the critical current and the current-phase relation are studied theoretically. It is found that both the barrier scattering and the roughness scattering at the interface always suppress the Andreev reflection and the current-phase relation is almost sinusoidal in the junction. The Josephson current strongly depends on the crystalline axis orientation of the d-wave superconductor in the junction. Some different phenomena appear depending on whether the crystal orientations of the superconductors on the two sides are the same or not, and this is mainly presented in the influence of the zero-energy states formation at the interface on the critical current which changes with temperature and phase.


JETP Letters ◽  
2018 ◽  
Vol 107 (1) ◽  
pp. 48-54 ◽  
Author(s):  
L. V. Ginzburg ◽  
I. E. Batov ◽  
V. V. Bol’ginov ◽  
S. V. Egorov ◽  
V. I. Chichkov ◽  
...  

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