Abstract
An ab initio analytical model for Fano resonances in two-channel systems is presented. We find that the lineshape parameter q factors into a background contribution q_b that depends only on the uncoupled channels and an interaction contribution q_i that is affected by the coupling between the channels, revealing how the overall lineshape parameter q may be controlled. In particular, we show how conical intersections of the background phase shifts have an important role in the interplay between q_b and q_i. Finally, control of Fano transmission profiles through q_b and q_i is demonstrated for quantum billiards.
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