Standard applications of density functional theory do not adequately describe the exfoliation energy of graphite. In fact, the local density approximation (LDA) and generalized gradient approximation (GGA) are in qualitative disagreement: the LDA binds at the experimental lattice constant, whereas the GGA does not. However, the variation in the energy under interlayer shifts, due predominantly to the overlap of π orbitals (not dispersion interactions), is nearly identical in these approximations. We combine these results with experimental information on the exfoliation energy to create an improved registry-dependent classical potential for the interlayer interaction in graphitic structures.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jun 15 2005|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics