Hybrid modes in the Fano regime of transport through open quantum dots

We analyze a quantum dot strongly coupled to the conducting leads via point contacts - Fano regime of transport - and report a variety of resonant states which demonstrate the dominance of the interacting resonances in the scattering process in a low confining potential. There are resonant states similar to the eigenstates of the isolated dot, whose widths increase with increasing the coupling strength to the environment, and hybrid resonant states. The last ones are approximatively obtained as a linear combination of degenerate eigenstates with the same parity, and the corresponding resonances show the phenomenon of the widths bifurcation: a resonant width strongly decreases with increasing the coupling strength to the leads and the other one increases. The existence of the hybrid modes suggests the behavior of the open quantum dot in the Fano regime as an artificial molecule.