Fractional Shapiro steps in resistively shunted Josephson junctions as a fingerprint of a skewed current-phase relationship

2020 ◽  
Vol 102 (5) ◽  
Author(s):  
B. Raes ◽  
N. Tubsrinuan ◽  
R. Sreedhar ◽  
D. S. Guala ◽  
R. Panghotra ◽  
...  
Keyword(s):  
Josephson Junctions ◽  
Phase Relationship ◽  
Current Phase ◽  
Shapiro Steps

scholarly journals Giant fractional Shapiro steps in anisotropic Josephson junction arrays

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
R. Panghotra ◽  
B. Raes ◽  
Clécio C. de Souza Silva ◽  
I. Cools ◽  
W. Keijers ◽  
...  
Keyword(s):  
Josephson Junction ◽  
Phase Relationship ◽  
Current Phase ◽  
Phase Dynamics ◽  
Shapiro Steps ◽  
High Frequency Response ◽  
Josephson Junction Arrays ◽  
Flux Quantization ◽  
Junction Arrays ◽  
Phase Relationships

Abstract Giant fractional Shapiro steps have been observed in Josephson junction arrays as resulting from magnetic flux quantization in the two-dimensional array. We demonstrate experimentally the appearance of giant fractional Shapiro steps in anisotropic Josephson junction arrays as unambiguous evidence of a skewed current phase relationship. Introducing anisotropy in the array results in a giant collective high frequency response that reflects the properties of a single junction, as evidenced by the observation of a Fraunhofer like magnetic field dependence of the total critical current of the system. The observed phase dynamics can be perfectly captured within an extended resistively shunted Josephson junction model. These results directly indicate the potential of Josephson junction arrays to explore the current phase relation in a very broad frequency range (down to 50 MHz) and in a wide variety of novel link materials exhibiting non-conventional current phase relationships.

scholarly journals Anomalous periodicity of the current-phase relationship of grain-boundary Josephson junctions in high-Tcsuperconductors

1999 ◽  
Vol 60 (5) ◽  
pp. 3096-3099 ◽  
Author(s):  
E. Il’ichev ◽  
V. Zakosarenko ◽  
R. P. J. IJsselsteijn ◽  
H. E. Hoenig ◽  
V. Schultze ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Josephson Junctions ◽  
Phase Relationship ◽  
Current Phase ◽  
Relationship Of

Current-phase relationship of YBa2Cu3O7−x ramp-edge Josephson junctions

2000 ◽  
Vol 76 (1) ◽  
pp. 100-102 ◽  
Author(s):  
E. Il’ichev ◽  
V. Zakosarenko ◽  
V. Schultze ◽  
H. E. Hoenig ◽  
H.-G. Meyer ◽  
...  
Keyword(s):  
Josephson Junctions ◽  
Phase Relationship ◽  
Current Phase ◽  
Relationship Of

scholarly journals Nonsinusoidal Current-Phase Relationship in Josephson Junctions from the 3D Topological Insulator HgTe

2015 ◽  
Vol 114 (6) ◽  
Author(s):  
Ilya Sochnikov ◽  
Luis Maier ◽  
Christopher A. Watson ◽  
John R. Kirtley ◽  
Charles Gould ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Josephson Junctions ◽  
Phase Relationship ◽  
Current Phase

scholarly journals Missing Shapiro steps in topologically trivial Josephson junction on InAs quantum well

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Matthieu C. Dartiailh ◽  
Joseph J. Cuozzo ◽  
Bassel H. Elfeky ◽  
William Mayer ◽  
Joseph Yuan ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Josephson Junctions ◽  
Current Phase ◽  
Majorana Fermions ◽  
Spin Orbit Coupling ◽  
Shapiro Steps ◽  
Experimental Consequence ◽  
Periodic Current ◽  
Strong Spin ◽  
Topological Superconductivity

AbstractJosephson junctions hosting Majorana fermions have been predicted to exhibit a 4π periodic current phase relation. One experimental consequence of this periodicity is the disappearance of odd steps in Shapiro steps experiments. Experimentally, missing odd Shapiro steps have been observed in a number of materials systems with strong spin-orbit coupling and have been interpreted in the context of topological superconductivity. Here we report on missing odd steps in topologically trivial Josephson junctions fabricated on InAs quantum wells. We ascribe our observations to the high transparency of our junctions allowing Landau-Zener transitions. The probability of these processes is shown to be independent of the drive frequency. We analyze our results using a bi-modal transparency distribution which demonstrates that only few modes carrying 4π periodic current are sufficient to describe the disappearance of odd steps. Our findings highlight the elaborate circumstances that have to be considered in the investigation of the 4π Josephson junctions in relationship to topological superconductivity.

Nonsinusoidal Current-Phase Relationship of Grain Boundary Josephson Junctions in High-TcSuperconductors

1998 ◽  
Vol 81 (4) ◽  
pp. 894-897 ◽  
Author(s):  
E. Il'ichev ◽  
V. Zakosarenko ◽  
R. P. J. IJsselsteijn ◽  
V. Schultze ◽  
H.-G. Meyer ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Josephson Junctions ◽  
Phase Relationship ◽  
Current Phase ◽  
Relationship Of

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
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