  The transport properties of nanostructured systems are deeply affected by the
geometry of the effective connections to metallic leads. In this work we derive
a conductance expression for interacting systems whose connectivity geometries
do not meet the Meir-Wingreen proportional coupling condition. As an
interesting application, we consider a quantum dot connected coherently to
tunable electronic cavity modes. The structure is shown to exhibit a
well-defined Kondo effect over a wide range of coupling strengths between the
two subsystems. In agreement with recent experimental results, the calculated
conductance curves exhibit strong modulations and asymmetric behavior as
different cavity modes are swept through the Fermi level. These conductance
modulations occur, however, while maintaining robust Kondo singlet correlations
of the dot with the electronic reservoir, a direct consequence of the lopsided
nature of the device.
