Modeling the linewidth dependence of coherent terahertz emission from intrinsic Josephson junction stacks in the hot-spot regime

B. Gross*, J. Yuan, D. Y. An, M. Y. Li, N. Kinev, X. J. Zhou, M. Ji, Y. Huang, T. Hatano, R. G. Mints, V. P. Koshelets, P. H. Wu, H. B. Wang, D. Koelle, R. Kleiner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, it has been found that, when operated at large input power, the linewidth Δf of terahertz radiation emitted from intrinsic Josephson junction stacks can be as narrow as some megahertz. In this high-bias regime, a hot spot coexists with regions which are still superconducting. Surprisingly, Δf was found to decrease with increasing bath temperature. We present a simple model describing the dynamics of the stack in the presence of a hot spot by two parallel arrays of pointlike Josephson junctions and an additional shunt resistor in parallel. Heat diffusion is taken into account by thermally coupling all elements to a bath at temperature Tb. We present current-voltage characteristics of the coupled system and calculations of the linewidth of the radiation as a function of Tb. In the presence of a spatial gradient of the junction parameters' critical current and resistance, Δf deceases with increasing Tb, similar to the experimental observation.

Original languageEnglish
Article number014524
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number1
DOIs
StatePublished - 25 Jul 2013

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