Cattapan, G.; Lotti, P. - In: The European Physical Journal B - Condensed Matter and … 60 (2007) 2, pp. 181-185
We have studied the behavior of the S–matrix poles near threshold for quantum waveguides coupled to a cavity with a defect. We emphasize the occurrence of both dominant and shadow poles on the various sheets of the energy Riemann surface, and show that the changes of the total conductivity...