Magneto-quantum oscillations of the conductance of a tunnel point-contact in the presence of a single defect

Details Magneto-quantum oscillations of the conductance of a tunnel point-contact in the presence of a single defect Magneto-quantum oscillations of the conductance of a tunnel point-contact in the presence of a single defect

2006-10-17

arxiv.org/abs/cond-mat/0610472v2

Phys. Rev. B 75, 125411 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 3 figures

Scientific paper

The influence of a quantizing magnetic field $H$ to the conductance of a tunnel point contact in the presence of the 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 non-monotonic dependence of the point-contact conductance results from a superposition of two types of oscillations: A short period oscillation arising from electron focusing by the field $H$ and a long period oscillation of Aharonov-Bohm-type 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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