https://doi.org/10.1140/epjb/e2006-00394-3
S-matrix pole trajectories in quantum wires with resonantly coupled cavities
1
Dipartimento di Fisica “G. Galilei”, Università di Padova, via F. Marzolo 8, 35131 Padova, Italy
2
Istituto Nazionale di Fisica Nucleare, Sezione di Padova, via F. Marzolo 8, 35131 Padova, Italy
Corresponding author: a giorgio.cattapan@pd.infn.it
Received:
1
June
2006
Revised:
20
September
2006
Published online:
27
October
2006
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.
PACS: 73.63.Nm – Quantum wires / 73.23.Ad – Ballistic transport / 72.10.Fk – Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006
