Abstract
The influence of a strong magnetic field $H$ to the conductance of a tunnel point contact in the presence of a single defect has been considered. We demonstrate that the conductance exhibits specific magneto-quantum oscillations, the amplitude and period of which depend on the distance between the contact and the defect. We show that a nonmonotonic dependence of the point-contact conductance results from a superposition of two types of oscillations: A short period oscillation arising from the electrons being focused by the field $H$ and a long period oscillation originated from the magnetic flux passing through the closed trajectories of electrons moving from the contact to the defect and returning back to the contact.
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