PHASE-COHERENT CONDUCTANCE OF MESOSCOPIC SUPERCONDUCTOR NORMAL-METAL COUPLED SYSTEMS

The effect of quasi-particle interference is studied on the conductanc e of ''hybrid'' mesoscopic systems composed of quasi-one-dimensional n ormal (N) wires of different topology in contact with S (superconducti ng)- and N-regions (banks). The results are found for different ratios between the resistances of the barriers at the N-wire-bank interfaces . For systems with a loop Aharonov-Bohm oscillations of the magnetocon ductance are studied and shown to be in agreement with experiment [Pet rashov et al., Phys. Rev. Lett. 70 (1993) 347].