MAGNETORESISTANCE OSCILLATION IN WINDOW-COUPLED WIRE SYSTEMS

We present a theoretical investigation of electron magnetotransport ch aracteristics of a window-coupled quantum wire system which is treated as a four-terminal device. Different shapes and sizes of the coupling region are studied and various four-terminal Buttiker resistances are computed as a function of an external magnetic field. Our results are consistent with those of the experimental measurements of Hirayama, T okura, Wieck, Koch, Haug, von Klitzing, and Ploog [Phys. Rev. B 48, 79 91 (1993)] on similar device structures. In particular we have observe d the fine interference pattern in the magnetoresistance and negative values of certain four-terminal resistance at low-magnetic-field stren gth. These features are found to be sensitive to the incoming electron energy. (C) 1996 American Institute of Physics.