Electron transport through molecular bridge systems

TL;DR

This paper investigates electron transport in molecular bridge systems using Green's function and tight-binding models, highlighting the effects of molecular length and coupling strength on transport properties and shot noise.

Contribution

It provides a detailed parametric analysis of electron transport in molecular chains, emphasizing the influence of molecular length and coupling strength, including shot noise behavior.

Findings

Transport properties depend strongly on molecular length and coupling strength.

Shot noise analysis reveals quantum charge quantization effects.

Steady state current characteristics are characterized under various parameters.

Abstract

Electron transport characteristics are investigated through some molecular chains attached to two non-superconducting electrodes by the use of Green's function method. Here we do parametric calculations based on the tight-binding formulation to characterize the electron transport through such bridge systems. The transport properties are significantly influenced by (a) the length of the molecular chain and (b) the molecule-to-electrodes coupling strength and here we focus are results in these aspects. In this context we also discuss the steady state current fluctuations, the so-called shot noise, which is a consequence of the quantization of charge and is not directly available through conductance measurements.