Direct Transition from Quantum Escape to a Phase Diffusion Regime in YBaCuO Biepitaxial Josephson Junctions

Luigi Longobardi; Davide Massarotti; Daniela Stornaiuolo; Luca Galletti; Giacomo Rotoli; Floriana Lombardi; Francesco Tafuri

doi:10.1103/PhysRevLett.109.050601

Direct Transition from Quantum Escape to a Phase Diffusion Regime in YBaCuO Biepitaxial Josephson Junctions

Luigi Longobardi, Davide Massarotti, Daniela Stornaiuolo, Luca Galletti, Giacomo Rotoli, Floriana Lombardi, Francesco Tafuri

DOI 10.1103/PhysRevLett.109.050601 · Physical Review Letters

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Abstract

Dissipation encodes the interaction of a quantum system with the environment and regulates the activation regimes of a Brownian particle. We have engineered grain boundary biepitaxial YBaCuO junctions to drive a direct transition from a quantum activated running state to a phase diffusion regime. The crossover to the quantum regime is tuned by the magnetic field and dissipation is described by a fully consistent set of junction parameters. To unravel phase dynamics in moderately damped systems is of general interest for advances in the comprehension of retrapping phenomena and in view of quantum hybrid technology.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBaCuO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown