Scanning tunneling microscopy and its applications by Chunli Bai

By Chunli Bai

This publication offers a unified view of the swiftly becoming box of scanning tunneling microscopy and its many derivatives. After studying novel scanning-probe recommendations and the instrumentation and techniques, the e-book presents special money owed of STM purposes. It examines boundaries of the present-day investigations and gives perception into extra tendencies. "I strongly suggest that Professor Bai's ebook join any library that serves floor scientists, biochemists, biophysicists, fabric scientists, and scholars of any technological know-how or engineering field...There isn't any doubt that this can be one of many greater (most considerate) texts." magazine of the yankee Chemical Society (Review of 1/e)

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However, there are still some problems to be resolved in the future. a) Influence of the Tip The size, shape and chemical identity of the tip influence not only the resolution and shape of a STM scan but also the measured electronic structure. It was shown that the wave functions of well-prepared, clean and stable tips (for instance, prepared by FIM) are apparently sufficiently featureless so as to be indistinguishable in the data. However, such well prepared tips have not been utilized in most STM and STS experiments.

Making use of the variables in the equation, the local work function or, correctly speaking, the effective tunneling barrier height between the tip and the sample can theoretically be derived from tunneling current I(s) at constant V or from the separation s(V) (we use s instead of d to represent the tip-sample separation hereafter) at constant I. Experimentally, d(1nI)/ds can be measured in STM experiments by a modulation of the gap separation with phase-sensitive detection of the current at the modulation The modulation signal divided by the current is, neglecting logarithmic terms in s, - d(lnl)/ds = V + (lIzV <1» xd/ds .

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