6 September 2000 Theoretical exploration of Josephson plasma emission in intrinsic Josephson junctions
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Abstract
In this paper, we theoretically predict the best efficient way for electromagnetic wave emission by Josephson plasma excitation in intrinsic Josephson junctions. First, we briefly derive basic equations describing dynamics of phase differences inside junction sites in intrinsic Josephson junctions, and review the nature of Josephson plasma excitation modes based on the equations. Especially, we make an attention to that Josephson plasma modes have much different dispersion relations depending on the propagating directions and their different modes can be recognized as N standing waves propagating along ab-plane in cases of finite stacked systems composed of N junctions. Second, we consider how to excite their modes and point out that excitations of in-phase mode with the highest propagation velocity among their N modes are the most efficient way for electromagnetic wave emissions. Finally, we clarify that in-phase excitations over all junctions are possible by using Josephson vortex flow states. We show simulation results of Josephson vortex flow states resonating with some Josephson plasma modes and predict that super-radiance of electromagnetic field may occur in rectangular vortex flow state in which spatio- temporal oscillations of electromagnetic fields are perfectly in- phase.
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Masashi Tachiki, Masahiko Machida, "Theoretical exploration of Josephson plasma emission in intrinsic Josephson junctions", Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); doi: 10.1117/12.397837; https://doi.org/10.1117/12.397837
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