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• W4387188410 abstract "We investigate properties of the transmission amplitude of quantum graphs and microwave networks composed of regular polygons such as triangles and squares. We show that for the graphs composed of regular polygons, with the edges of the length $l,$ the transmission amplitude displays a band of transmission suppression with some narrow peaks of full transmission. The peaks are distributed symmetrically with respect to the symmetry axis $kl=ensuremath{pi}$, where $k$ is the wave vector. For microwave networks the transmission peak amplitudes are reduced and their symmetry is broken due to the influence of internal absorption. We demonstrate that for the graphs composed of the same polygons but separated by the edges of length ${l}^{ensuremath{'}}<l,$ the transmission spectrum is generally not symmetric according to the axis $k{l}^{ensuremath{'}}=ensuremath{pi}$. We also show that graphs composed of regular polygons of different size with the edges being irrational numbers are not fully chaotic and their level spacing distribution and the spectral rigidity are well described by the Berry-Robnik distributions. Moreover, the transmission spectrum of such a graph displays peaks which are very close to one. Furthermore, the microwave networks are investigated in the time-domain using short Gaussian pulses. In this case the delay-time distributions, though very sensitive to the internal structure of the networks, show the sequences of transmitted peaks with the amplitudes much smaller than the input one. The analyzed properties of the graphs and networks suggest that they can be effectively used to manipulate quantum and wave transport." @default.
• W4387188410 created "2023-09-30" @default.
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• W4387188410 date "2023-09-29" @default.
• W4387188410 modified "2023-09-30" @default.
• W4387188410 title "Quantum graphs and microwave networks as narrow-band filters for quantum and microwave devices" @default.
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• W4387188410 doi "https://doi.org/10.1103/physreve.108.034219" @default.
• W4387188410 hasPublicationYear "2023" @default.
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