Physics-based Modeling and Device Simulation of Josephson Junctions
Pooya Jannaty
Synopsys, US
ABSTRACT
This tutorial will take a brief survey of the physics of Josephson-junction devices under equilibrium and non-equilibrium conditions using self-consistent quantum mean-field theory. The formation of Cooper pairs and the superconducting gap as well as the supercurrent and quasi-particle tunneling mechanism for a device under phase bias is studied. In non-equilibrium, the Floquet theory is used to model and simulate the frequency-domain behavior of the Josephson junctions under externally-applied voltage bias. Such physical phenomena as the proximity effect, the Andreev bound states, the multiple Andreev reflections, as well as the effect of barrier height, temperature, and disorder are discussed, and simulation results using Synopsys tools employing nonequilibrium Green's function formalism are presented.
