By R. Wiesendanger, H.-J. Güntherodt (auth.), Professor Dr. Roland Wiesendanger, Professor Dr. Hans-Joachim Güntherodt (eds.)
This ebook offer a distinct creation to the speculation of scanning tunneling microscopy and similar scanning probe tools. it really is written by way of specialists who've built the theoretical foundations for knowing the distinction mechanisms serious about a few of the neighborhood probe equipment. an outline of different theoretical techniques is gifted so that it will be precious for each theorist beginning during this box. however, the consequences fo the theoretical effects are mentioned intimately. consequently, this publication will function a Most worthy consultant for experimentalists as wll, facilitating the translation in their facts.
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Additional info for Scanning Tunneling Microscopy III: Theory of STM and Related Scanning Probe Methods
Wiesen danger . -J. Giintherodt © Springer-Verlag Berlin Heidelberg 1993 24 G. 1. Comparison of local charge-density arguments with STM experiments Sample Expectation for STM from local charge density STM experiment Clean metal surface Qualitative similar results as for He-scattering Large corrugation for Al(lll); SmalI corrugation for Ni(lOO) Adsorbed atoms Appear as protrusions K-atoms not seen on Cu(llO); Oxygen atoms appear often as indentations Insulating organic layers Not visible in STM STM images reflecting the expected geometry distribution near the tip region are calculated numerically exactly.
Fig. 10. 8 A showing image inversion. -. -. I I (a) (b) Fig. 11. 8 A and sample increases the density of states at the Fermi level, because the anti-bonding state has some spectral weight here, and therefore leads to a larger tunnel current. The bond is somewhat stronger in the hollow position compared to the top position. The effects of chemical bond formation between the tip atom and the sample surface are present for the AI(111) surface as well, but they are smaller, because no d-electrons are present.
E~n~ i + (V~CI c: CCI + herm. ) +L j ECjncj + L(VCjCkC~/Ck + herm. ) jk + L(VCNfCiNCf + herm. ) + LGfnf f . 16) f Here the notation of second quantization has been used. The model describes two three-dimensional gold electrodes. 16)). The alkane chain is described· in a tight-binding aproximation (third line). 16)J and the gold substrate (fourth line) by one-electron hopping matrix elements. 43]. 42]. In fact, an increase in conductivity by ten orders of magnitude is found, if a strong compression of the alkane layer by the tip is assumed.
Scanning Tunneling Microscopy III: Theory of STM and Related Scanning Probe Methods by R. Wiesendanger, H.-J. Güntherodt (auth.), Professor Dr. Roland Wiesendanger, Professor Dr. Hans-Joachim Güntherodt (eds.)
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