<h>Quantum crossover in moderately damped epitaxial NbN</h>/<h>MgO</h>/<h>NbN junctions with low critical current density</h>

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Quantum crossover in moderately damped epitaxial NbN/MgO/NbN junctions with low critical current density

Longobardi, Luigi; Massarotti, Davide; Rotoli, Giacomo; Stornaiuolo, Daniela; Papari, Gianpaolo; Kawakami, Akira; Pepe, Giovanni Piero; Barone, Antonio; Tafuri, Francesco

arXiv.org, 11/2011

Paper, Journal Article

High quality epitaxial NbN/MgO/NbN Josephson junctions have been realized with MgO barriers up to a thickness of d=1 nm. The junction properties coherently scale with the size of barrier, and low critical current densities down to 3 A/cm\(^2\) have been achieved for larger barriers. In this limit, junctions exhibit macroscopic quantum phenomena for temperatures lower than 90 mK. Measurements and junction parameters support the notion of a possible use of these devices for multiphoton quantum experiments, taking advantage of the fast non equilibrium electron-phonon relaxation times of NbN.

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