Low Temperature Physics: 31, 338 (2005); https://doi.org/10.1063/1.1884438 (14 pages)
Fizika Nizkikh Temperatur: Volume 31, Number 3-4 (March 2005), p. 445-462    ( to contents , go back )

Electron transmission through a linear molecule: the role of delocalized and localized states in formation of the current

E.G. Petrov

Bogolyubov Institute for Theoretical Physics, National Academy of Sciences Metrologichna Str. 14-b, Kiev, 03143 Ukraine
pos Анотація:

Received September 1, 2004, revised September 13, 2004

Abstract

Exact formulae for electron current under quasi-elastic and elastic transmission of an electron through a molecule are derived. The mechanism of elastic transmission is analized in detail. It is shown that on strong electron delocalization there occurs a «metallization» of the molecule and as a consequence all its energy levels exibit an identical shift when a voltage bias is applied to electrodes. This accounts for the presence of resonance peaks in the molecular conductivity. On strong electron localization in the molecule the existance of the peaks is associated with the resonance electron transmission between the localized molecular electronic levels and the electrode Fermi levels. The appearance of a negative molecular conductivity is also associated with the molecular localized electronic levels.

PACS:
05.20.Dd - Kinetic theory (see also 51.10.+y Kinetic and transport theory of gases)
05.60.+w -

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