First-Principle Description of Correlation Effects in Layered Materials

Details First-Principle Description of Correlation Effects in Layered Materials First-Principle Description of Correlation Effects in Layered Materials

2005-10-10

arxiv.org/abs/cond-mat/0510221v2

Physics

Condensed Matter

Materials Science

Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.96.136404

We present a first-principles description of anisotropic materials characterized by having both weak (dispersion-like) and strong covalent bonds, based on the Adiabatic--Connection Fluctuation--Dissipation Theorem within Density Functional Theory. For hexagonal boron nitride the in-plane and out of plane bonding as well as vibrational dynamics are well described both at equilibrium and when the layers are pulled apart. Also bonding in covalent and ionic solids is described. The formalism allows to ping-down the deficiencies of common exchange-correlation functionals and provides insight towards the inclusion of dispersion interactions into the correlation functional.

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