Publication

Electron density of states at Ge/oxide interfaces due to GeOx formation

Alfredo Pasquarello, Peter Broqvist, Jan Felix Binder
2011
Conference Papers

Abstract

An atomistic model of substoichiometric germanium oxide is generated through ab initio molecular dynamics. The resulting structure shows a predominance of threefold coordinated Ge and O atoms. We also generate substoichiometric models through bond-switching Monte-Carlo simulations, which preserve the fourfold Ge and the twofold O coordinations. These differing structures are energetically competitive. Alignment of their electron densities of states to that of GeO2 reveals that the band-gap reduction is similar for both structures, mainly occurring through a shift of the valence band edge.

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https://infoscience.epfl.ch/entities/publication/b52291ac-b3b2-4b81-870a-abd8f3cc54cf

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Alfredo Pasquarello, Peter Broqvist, Jan Felix Binder
2011
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b52291ac-b3b2-4b81-870a-abd8f3cc54cf

About this result

Related concepts (22)

Electron density

Electron density or electronic density is the measure of the probability of an electron being present at an infinitesimal element of space surrounding any given point. It is a scalar quantity depending upon three spatial variables and is typically denoted as either or . The density is determined, through definition, by the normalised -electron wavefunction which itself depends upon variables ( spatial and spin coordinates). Conversely, the density determines the wave function modulo up to a phase factor, providing the formal foundation of density functional theory.

Density functional theory

Density-functional theory (DFT) is a computational quantum mechanical modelling method used in physics, chemistry and materials science to investigate the electronic structure (or nuclear structure) (principally the ground state) of many-body systems, in particular atoms, molecules, and the condensed phases. Using this theory, the properties of a many-electron system can be determined by using functionals, i.e. functions of another function. In the case of DFT, these are functionals of the spatially dependent electron density.

Free electron model

In solid-state physics, the free electron model is a quantum mechanical model for the behaviour of charge carriers in a metallic solid. It was developed in 1927, principally by Arnold Sommerfeld, who combined the classical Drude model with quantum mechanical Fermi–Dirac statistics and hence it is also known as the Drude–Sommerfeld model.

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