Tip induced localized states in scanning tunneling microscopy

Date

1988

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Source Title

Physica Scripta

Print ISSN

0031-8949

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Institute of Physics Publishing Ltd.

Volume

38

Issue

3

Pages

486 - 490

Language

English

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Abstract

We have investigated the Scanning Tunneling Microscopy (STM) of graphite with varying tip-to-surface distance. Using an LCAO type approach we showed that at small separations states are localized between the tip and the surface. The energies and the characters of these Tip Induced Localized States (TILS) depend on the height and the lateral position of the tip. These states play a significant role in the tunneling process and influence the STM corrugations predicted from the local density of states. We have developed a current expression, which includes these local interactions, but differes significantly from earlier theories.

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