Fluxons and their interactions in a system of three stacked Josephson junctions

Gorria, Carlos; Christiansen, Peter Leth; Gaididei, Yuri; Muto, V.; Pedersen, Niels Falsig; Soerensen, M. P.

doi:10.1103/physrevb.68.035415

Cited by 13 publications

(7 citation statements)

References 46 publications

(76 reference statements)

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“…Because of repulsive interaction, it is believed to be hard to achieve in-phase motion of solitons in a stack of junctions, despite some simulations suggest that the solitons in high velocity have attractive interaction. [38,55] Here we investigate the radiation due to soliton motions in a single junction, which is equivalent to a stack of junctions if one realizes the in-phase motion of solitons in different junctions.…”

Section: State With Solitonsmentioning

confidence: 99%

Phase dynamics in intrinsic Josephson junctions and their electrodynamics

Lin

2009

Phys. Rev. B

174

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We present a theoretical description of the phase dynamics and its corresponding electrodynamics in a stack of inductively coupled intrinsic Josephson junctions of layered high-Tc superconductors in the absence of an external magnetic field. Depending on the spatial structure of the gauge invariant phase difference, the dynamic state is classified into: state with kink, state without kink, and state with solitons. It is revealed that in the state with phase kink, the plasma is coupled to the cavity and the plasma oscillation is enhanced. In contrast, in the state without kink, the plasma oscillation is weak. It points a way to enhance the radiation of electromagnetic from high-Tc superconductors. We also perform numerical simulations to check the theory and a good agreement is achieved. The radiation pattern of the state with and without kink is calculated, which may serve as a fingerprint of the dynamic state realized by the system. At last, the power radiation of the state with solitons is calculated by simulations. The possible state realized in the recent experiments is discussed in the viewpoint of the theoretical description. The state with kink is important for applications including terahertz generators and amplifiers.

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Section: State With Solitonsmentioning

confidence: 99%

Phase dynamics in intrinsic Josephson junctions and their electrodynamics

Lin

2009

Phys. Rev. B

174

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“…In this range, the fluxons are bunched. For the case of two junctions, this minimum would have been zero phase difference, but due to the asymmetry of the three-junction case, there is a small residual phase [11]. Fig.…”

Section: Numerical Calculationsmentioning

confidence: 96%

Long Josephson Junction Stack Coupled to a Cavity

Madsen

Pedersen

Grønbech‐Jensen³

2007

IEEE Trans. Appl. Supercond.

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“…The mass M e accounts for the renormalization effect of both junction-cavity and magnetic induction interaction. The bare potential V (q) = V (q 1 , q 2 ) is given 33 by…”

Section: Coupled Long Josephson Junctions In Resonant Cavitymentioning

confidence: 99%

“…When E int ≫ E pin , the fluxons are not pinned at the microresistor sites but maintain a large separation distance. 33 However, when E int ≪ E pin , the one-fluxon tunneling processes are favored over the two-fluxon tunneling processes.…”

Section: Macroscopic Quantum Tunneling In Coupled Junctionsmentioning

confidence: 99%

Effects of a resonant cavity on macroscopic quantum tunneling of fluxons in long Josephson junctions

Kim

Dhungana

2011

Phys. Rev. B

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We investigate the effects of high-Qc resonant cavity on macroscopic quantum tunneling (MQT) of fluxon both from a metastable state to continuum and from one degenerate ground-state of a double-well potential to the other. By using a set of two coupled perturbed sine-Gordon equations, we describe the tunneling processes in linear long Josephson junctions (LJJs) and find that MQT in the resonant cavity increases due to potential renomalization, induced by the interaction between the fluxon and cavity. Enhancement of the MQT rate in the weak-coupling regime is estimated by using the experimantally accessible range of the model parameters. The tunneling rate from the metastable state is found to increase weakly with increasing junction-cavity interaction strength. However, the energy splitting between the two degenerate ground-states of the double-well potential increases significantly with increasing both the interaction strength and frequency of the resonant cavity mode. Finally, we discuss how the resonant cavity may be used to tune the property of Josephson vortex quantum bits.

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Fluxons and their interactions in a system of three stacked Josephson junctions

Cited by 13 publications

References 46 publications

Phase dynamics in intrinsic Josephson junctions and their electrodynamics

Phase dynamics in intrinsic Josephson junctions and their electrodynamics

Long Josephson Junction Stack Coupled to a Cavity

Effects of a resonant cavity on macroscopic quantum tunneling of fluxons in long Josephson junctions

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