Resonant tunneling through Andreev levels

We use a semiclassical approach for analyzing the tunneling transport throu gh a normal conductor in contact with superconducting mirrors. Our analysis of the electron-hole propagation along semiclassical trajectories shows th at resonant transmission through Andreev levels is possible resulting in an excess, low-energy quasiparticle contribution to the conductance. The exce ss conductance oscillates with the phase difference between the superconduc tors having maxima at odd multiples of pi for temperatures much below the T houless temperature. (C) 1999 Academic Press.