Enhancement of Josephson phase diffusion by microwaves

Abstract

We report an experimental and theoretical study of the phase diffusion in small Josephson junctions under microwave irradiation. A peculiar enhancement of the phase diffusion by microwaves is observed. The enhancement manifests itself by a pronounced current peak in the current-voltage characteristics. The voltage position $V_{\mathrm{top}}$ of the peak increases with the power $P$ of microwave radiation as $V_{\mathrm{top}}\propto \sqrt{P}$, while its current amplitude weakly decreases with $P$. As the microwave frequency increases, the peak feature evolves into Shapiro steps with finite slope. Our theoretical analysis taking into account the enhancement of incoherent superconducting current by multi-photon absorption is in good agreement with experimental data.

5 pages, 4 figures

References in corpus (7)

• Multi-photon transitions between energy levels in a current-biased Josephson tunnel junction
• Fluctuation Dominated Josephson Tunneling with a Scanning Tunneling Microscope
• Phase diffusion and charging effects in Josephson junctions
• Thermal fluctuations in ultrasmall intrinsic Josephson junctions
• Quantum Brownian motion in ratchet potentials
• Quantum escape of the phase in a strongly driven Josephson junction
• Symmetry broken motion of a periodically driven Brownian particle: nonadiabatic regime

Cited by in corpus (13)

• Observation of transition from escape dynamics to underdamped phase diffusion in a Josephson junction
• Crossover from Kramers to phase-diffusion switching in hysteretic DC-SQUIDs
• Collective transport in the insulating state of Josephson junction arrays
• Time-domain measurements of quasiparticle tunneling rates in a single-Cooper-pair transistor
• Terahertz Bloch oscillator with a modulated bias
• Quantum Phase Diffusion in a Small Underdamped Josephson Junction
• Quantitative description of Josephson-like tunneling in ${\nu }_T=1$ quantum Hall bilayers
• Quantifying quantum coherence of multiple-charge states in tunable Josephson junctions
• Microwave-induced flow of vortices in long Josephson junctions
• Transport signatures of Van Hove singularities in mesoscopic twisted bilayer graphene
• Influence of topological excitations on Shapiro steps and microwave dynamical conductance in bilayer exciton condensates
• Model of multiphoton transitions in a current-biased Josephson junction
• Directed motion of domain walls in biaxial ferromagnets under the influence of periodic external magnetic fields