First-principles methodology for quantum transport in multiterminal junctions

Details First-principles methodology for quantum transport in multiterminal junctions First-principles methodology for quantum transport in multiterminal junctions

2008-09-10

arxiv.org/abs/0809.1696v2

Physics

Condensed Matter

Materials Science

Will be coming out in JCP soon

Scientific paper

We present a generalized approach for computing electron conductance and I-V characteristics in multiterminal junctions from first-principles. Within the framework of Keldysh theory, electron transmission is evaluated employing an O(N) method for electronic-structure calculations. The nonequilibrium Green function for the nonequilibrium electron density of the multiterminal junction is computed self-consistently by solving Poisson equation after applying a realistic bias. We illustrate the suitability of the method on two examples of four-terminal systems, a radialene molecule connected to carbon chains and two crossed carbon chains brought together closer and closer. We describe charge density, potential profile, and transmission of electrons between any two terminals. Finally, we discuss the applicability of this technique to study complex electronic devices.

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