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

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

2011-11-22

arxiv.org/abs/1111.5091v1

Appl. Phys. Lett. 99, 062510 (2011)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1063/1.3624471

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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