Critical current of dc SQUID on Josephson junctions with unconventional current-phase relation

2020 ◽  
Vol 46 (9) ◽  
pp. 919-922
Author(s):  
I. N. Askerzade ◽  
R. T. Askerbeyli
Keyword(s):  
Critical Current ◽  
Phase Relation ◽  
Josephson Junctions ◽  
Current Phase

scholarly journals 1/f critical current noise in short ballistic graphene Josephson junctions

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Francesco M. D. Pellegrino ◽  
Giuseppe Falci ◽  
Elisabetta Paladino
Keyword(s):  
Critical Current ◽  
Phase Relation ◽  
Josephson Junctions ◽  
Two Dimensions ◽  
Density Fluctuations ◽  
Hybrid Nanostructures ◽  
Current Phase ◽  
Carrier Traps ◽  
Current Threshold ◽  
Sinusoidal Current

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.

scholarly journals Observation of nonsinusoidal current-phase relation in graphene Josephson junctions

2016 ◽  
Vol 94 (11) ◽  
Author(s):  
C. D. English ◽  
D. R. Hamilton ◽  
C. Chialvo ◽  
I. C. Moraru ◽  
N. Mason ◽  
...  
Keyword(s):  
Phase Relation ◽  
Josephson Junctions ◽  
Current Phase

INTERFACE SCATTERING EFFECT ON JOSEPHSON CURRENT IN A d-WAVE SUPERCONDUCTOR/d-WAVE SUPERCONDUCTOR JUNCTION

2011 ◽  
Vol 25 (02) ◽  
pp. 131-140 ◽  
Author(s):  
YAN-HUA LIAO ◽  
JIAN LI ◽  
FENG WANG
Keyword(s):  
Critical Current ◽  
Phase Relation ◽  
Josephson Current ◽  
Current Phase ◽  
Insulator Layer ◽  
Axis Orientation ◽  
Scattering Effect ◽  
Interface Scattering ◽  
Layer I ◽  
D Wave

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.

Determination of the Current–Phase Relation in Josephson Junctions by Means of an Asymmetric Two-Junction SQUID

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 ◽  
...  
Keyword(s):  
Phase Relation ◽  
Josephson Junctions ◽  
Current Phase
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