Current Delivered by an STM Tip in Landauer-Büttiker Formalism

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When an STM tip is brought close to a nano sized sample then it can deliver (or draw) a current that is determined by the Landauer-Büttiker formalism in terms of the scattering matrix that gives partial local density of states. We show that, very paradoxically, the interference related term in this formula vanish in a quantum regime making semi-classical formula for injectance exact in some regime. We explicitly show how evanescent modes are responsible for this. This can have useful implications to experimentalists as semi-classical formulas are much simpler.

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Edited by:

Mohamed Othman

Pages:

1630-1634

Citation:

U. Satpathi, "Current Delivered by an STM Tip in Landauer-Büttiker Formalism", Applied Mechanics and Materials, Vols. 229-231, pp. 1630-1634, 2012

Online since:

November 2012

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DOI: https://doi.org/10.1142/9789812701909_0003

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