  We report on a new type of Fano effect, named as Andreev-Fano effect, in a
hybrid normal-metal / superconductor (N/S) interferometer embedded with a
quantum dot. Compared with the conventional Fano effect, Andreev-Fano effect
has some new features related to the characteristics of Andreev reflection. In
the linear response regime, the line shape is the square of the conventional
Fano shape; while in the nonlinear transport, a sharp resonant structure is
superposed on an expanded interference pattern, qualitatively different from
the conventional Fano effect. The phase dependence of the hybrid N/S
interferometer is also distinguished from those of all-N or all-S
interferometers.
