# Stillinger-Weber parameters for various elements and mixtures
# multiple entries can be added to this file, LAMMPS reads the ones it needs
# these entries are in LAMMPS "real" units:
# epsilon and sigma reduced units
# other quantities are unitless
# format of a single entry (one or more lines):
# element 1, element 2, element 3,
# epsilon, sigma, a, lambda, gamma, costheta0, A, B, p, q
# Note that in LAMMPS, two-body parameters for element i and j are
# specified by the values on the i-j-j line. Two-body
# values on the i-j-i or i-i-j lines are ignored by LAMMPS, and so
# are set to zero here.
# here we are putting to zero the GeGe interaction because we'll use it as rigid wall
Si Si Si 6.189 2.3925 1.80 23.15 1.20 -0.333333333333 7.049556277 0.6022245584 4.0 0.0 0.0
#assigns parameters in the ORDER that is read "i j i" is not the same as "i i j"
# it is reading the pair parameters only for the i j j case
#Si Si from Si Si Si
#Si Ge from Si Ge Ge
#Ge Si from Ge Si Si
#Ge Ge from Ge Ge Ge
# for the three body params is also reading in th order they appear, so we have to make sure
# that parameters for i j k are same as for i k j (central is i, the other two are symmetric
# for the potential but we can choose them independently