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

Abstract

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.

13 pages, 3 figures

References in corpus (7)

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• Method to determine defect positions below a metal surface by STM
• Effect of quantum interference in the nonlinear conductance of microconstrictions
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Cited by in corpus (7)

• Theory of oscillations in the STM conductance resulting from subsurface defects (Review Article)
• Conductance of a tunnel point-contact of noble metals in the presence of a single defect
• The signature of subsurface Kondo impurities in the local tunnel current
• Quantum interference effects in a system of two tunnel point-contacts in the presence of single scatterer: simulation of a double-tip STM experiment
• Magneto-orientation and quantum size effect in SP-STM conductance in the presence of a subsurface magnetic cluster
• Influence of a single defect on the conductance of a tunnel point contact between a normal metal and a superconductor
• Conductance of a STM contact on the surface of a thin film