Abstract.
We consider a T-shaped, one-dimensional quantum waveguide containing an attractive or repulsive impurity in the lateral stub, and study how the resonance poles move in the complex k-plane when the strength or the position of the defect changes. Similarities and differences with respect to standard potential scattering problems are highlighted.
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Cattapan, G., Lotti, P. & Pascolini, A. S-matrix pole trajectories in quantum wires with resonantly coupled cavities. Eur. Phys. J. B 53, 387–394 (2006). https://doi.org/10.1140/epjb/e2006-00394-3
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DOI: https://doi.org/10.1140/epjb/e2006-00394-3