"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c

:link(lws,http://lammps.sandia.gov)
:link(ld,Manual.html)
:link(lc,Section_commands.html#comm)

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pair_style kolmogorov/crespi/z command :h3

[Syntax:]

pair_style hybrid/overlay kolmogorov/crespi/z cutoff :pre

[Examples:]

pair_style hybrid/overlay kolmogorov/crespi/z 20.0
pair_coeff * * none
pair_coeff 1 2 kolmogorov/crespi/z  CC.KC   C C :pre

pair_style hybrid/overlay rebo kolmogorov/crespi/z 14.0
pair_coeff * * rebo                 CH.airebo  C C
pair_coeff 1 2 kolmogorov/crespi/z  CC.KC      C C :pre

[Description:]

The {kolmogorov/crespi/z} style computes the Kolmogorov-Crespi interaction 
potential as described in "(KC05)"_#KC05. An important simplification is made, 
which is to take all normals along the z-axis. 

:c,image(Eqs/pair_kolmogorov_crespi_z.jpg)

It is important to have a suffiently large cutoff to ensure smooth forces. 
Energies are shifted so that they go continously to zero at the cutoff assuming 
that the exponential part of {Vij} (first term) decays sufficiently fast.
This shift is achieved by the last term in the equation for {Vij} above.

This potential is intended for interactions between two layers of graphene. 
Therefore, to avoid interaction between layers in multi-layered materials, 
each layer should have a separate atom type and interactions should only 
be computed between atom types of neighbouring layers.

The parameter file (e.g. CC.KC), is intended for use with metal 
"units"_units.html, with energies in meV. An additional parameter, {S}, 
is available to facilitate scaling of energies in accordance with 
"(vanWijk)"_#vanWijk.

This potential must be used in combination with hybrid/overlay.
Other interactions can be set to zero using pair_style {none}.

[Restrictions:]

This fix is part of the USER-MISC package.  It is only enabled if
LAMMPS was built with that package.  See the "Making
LAMMPS"_Section_start.html#start_3 section for more info.

[Related commands:]

"pair_coeff"_pair_coeff.html
"pair_none"_pair_none.html
"pair_style hybrid/overlay"_pair_hybrid.html

[Default:] none

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:link(KC05) 
[(KC05)] A. N. Kolmogorov, V. H. Crespi, Phys. Rev. B 71, 235415 (2005)

:link(vanWijk)
[(vanWijk)] M. M. van Wijk, A. Schuring, M. I. Katsnelson, and A. Fasolino,
Physical Review Letters, 113, 135504 (2014)
