Nonlinear Nonequilibrium Quasiparticle Relaxation in Josephson Junctions

V. M. Krasnov

doi:10.1103/PhysRevLett.103.227002

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Nonlinear Nonequilibrium Quasiparticle Relaxation in Josephson Junctions

V. M. Krasnov

DOI 10.1103/PhysRevLett.103.227002 · Physical Review Letters

T1

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Abstract

I solve numerically a full set of nonlinear kinetic balance equations for stacked Josephson junctions, which allows analysis of strongly nonequilibrium phenomena. It is shown that nonlinearity becomes significant already at very small disequilibrium. The following new, nonlinear effects are obtained: (i) At even-gap voltages V=2nΔ/e (n=2,3,…) nonequilibrium bosonic bands overlap. This leads to enhanced emission of Ω=2Δ bosons and to the appearance of dips in tunnel conductance. (ii) A new type of radiative solution is found at strong disequilibrium. It is characterized by the fast stimulated relaxation of quasiparticles. A stack in this state behaves as a light emitting diode and directly converts electric power to boson emission, without utilization of the ac-Josephson effect. The phenomenon can be used for realization of a new type of superconducting cascade laser in the THz frequency range.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown