Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-04-20
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
31 pages, 10 figuers Submitted to Low. Temp. Phys
Scientific paper
In this review we present recent theoretical results concerning investigations of single subsurface defects by means of a scanning tunneling microscope (STM). These investigations are based on the effect of quantum interference between the electron partial waves that are directly transmitted through the contact and the partial waves scattered by the defect. In particular, we have shown the possibility imaging the defect position below a metal surface by means of STM. Different types of subsurface defects have been discussed: point-like magnetic and non-magnetic defects, magnetic clusters in a nonmagnetic host metal, and non-magnetic defects in a s-wave superconductor. The effect of Fermi surface anisotropy has been analyzed. Also, results of investigations of the effect of a strong magnetic field to the STM conductance of a tunnel point contact in the presence of a single defect has been presented.
Avotina Ye. S.
Kolesnichenko Yu. A.
van Ruitenbeek Jan M.
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