Non-linear response of molecular junctions: The polaron model revisited

Details Non-linear response of molecular junctions: The polaron model revisited Non-linear response of molecular junctions: The polaron model revisited

2008-01-24

arxiv.org/abs/0801.3783v1

J. Phys.: Condens. Matter 20, 374107 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 1 figure

Scientific paper

10.1088/0953-8984/20/37/374107

A polaron model proposed as a possible mechanism for nonlinear conductance [Galperin M, Ratner M A, and Nitzan A 2005 Nano Lett. 5 125-30] is revisited with focus on the differences between the weak and strong molecule-lead coupling cases. Within the one-molecular level model we present an approximate expression for the electronic Green function corresponding to inelastic transport case, which in the appropriate limits reduces to expressions presented previously for the isolated molecule and for molecular junction coupled to a slow vibration (static limit). The relevance of considerations based on the isolated molecule limit to understanding properties of molecular junctions is discussed.

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