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Nonlinear Nonequilibrium Quasiparticle Relaxation in Josephson Junctions
Stockholm University, Faculty of Science, Department of Physics. (Experimental Condensed Matter Physics)
2009 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 103, no 22, 227002- p.Article in journal (Refereed) Published
Abstract [en]

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=2n/e (n=2,3,…) nonequilibrium bosonic bands overlap. This leads to enhanced emission of =2 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.

Place, publisher, year, edition, pages
2009. Vol. 103, no 22, 227002- p.
Keyword [en]
lasing, Josephson junction, THz emission
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:su:diva-32119DOI: 10.1103/PhysRevLett.103.227002ISI: 000272182000046OAI: diva2:279489
Available from: 2009-12-03 Created: 2009-12-03 Last updated: 2009-12-04Bibliographically approved

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Krasnov, Vladimir
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