THz emission from a stacked coherent flux-flow oscillator: non-local radiative boundary conditions and the role of geometrical resonances - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: I derive simple non-local dynamic boundary conditions, suitable for modellingof radiation emission from stacked Josephson junctions, and employ them foranalysis of flux-flow emission from intrinsic Josephson junctions in high-$T c$superconductors. It is shown that due to the lack of Lorenz contraction offluxons in stacked junctions, high quality geometrical resonances areprerequisite for high power emission from the stack. This leads to a dual roleof the radiative impedance: on the one hand, small impedance increases theefficiency of emission from the stack, on the other hand, enhanced radiativelosses reduce the quality factor of geometrical resonances, which may decreasethe total emission power. Therefore, the optimal conditions for the coherentflux-flow oscillator are achieved when radiative losses are comparable toresistive losses inside the stack.



Autor: V.M. Krasnov

Fuente: https://arxiv.org/







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