Nonlinear Phase Dynamics in a Driven Bosonic Josephson Junction

The phase dynamics of a stack of long Josephson junctions has been studied. Both inductive and capacitive couplings between Josephson junctions have been taken into account in the calculations. The IV-curve, the dependence on the bias current of the radiation power and dynamics of each JJs of the stack have been investigated. The coexistence of the charge traveling wave and fluxon states has been observed. This state can be considered as a new collective excitation in the system of coupled Josephson junctions. We demonstrate that the observed collective excitation leads to the decrease of radiation power from the system.

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Quantum phase dynamics in an LC shunted Josephson junction

Journal of Applied Physics ◽

10.1063/1.3581139 ◽

2011 ◽

Vol 109 (9) ◽

pp. 093915 ◽

Cited By ~ 1

Author(s):

Ch. Kaiser ◽

T. Bauch ◽

F. Lombardi ◽

M. Siegel

Keyword(s):

Josephson Junction ◽

Quantum Phase ◽

Phase Dynamics

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Giant fractional Shapiro steps in anisotropic Josephson junction arrays

Communications Physics ◽

10.1038/s42005-020-0315-5 ◽

2020 ◽

Vol 3 (1) ◽

Cited By ~ 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.

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