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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3624471]
Quantum crossover in moderately damped epitaxial NbN/MgO/NbN junctions with low critical current density / Longobardi, L., Massarotti, D., Rotoli, G., Stornaiuolo, D., Papari, G., Kawakami, A., Pepe, G.P., Barone, A., Tafuri, F.. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 99:(2011), pp. 062510-062510. [10.1063/1.3624471]
Quantum crossover in moderately damped epitaxial NbN/MgO/NbN junctions with low critical current density
MASSAROTTI, DAVIDE;STORNAIUOLO, DANIELA;G. Papari;PEPE, GIOVANNI PIERO;Tafuri, Francesco
2011
Abstract
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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3624471]I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
