Abstract
Quantum interference effects of electron waves in a Y-shaped structure of a quantum wire with a stub fabricated in a split gate configuration were experimentally studied. Periodic conductance oscillations as a function of gate voltage, which were characterized by a single peak in a Fourier spectrum, were observed. In contrast, aperiodic conductance oscillations were observed in a Y-shaped branch in which the reflection wall in the stub had been removed. The clear difference of the conductance characteristics in these structures suggests that the observed periodic oscillations were caused by the quantum interference in the stub. In addition, the calculated gate voltage period based on a model that the conductance oscillations are due to quantum interference in the stub was in good agreement with the experimental period. From these experimental results, it was concluded that the observed periodic conductance oscillations for the Y-shaped structures were due to the quantum interference effect of electron waves in the stub.
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