defined in DASSEMBLERS/getforce_classic_Tersoff.f90

The implementation use the shape of tersoff potential published in

• PRB37(1988)6991
• PRB39(1989)5566

(with aij=1)

The parameters of the potential are defined in file Cdata/Tersoff.dat:

#       A       B       lambda1 lambda2 lambda3 beta        n       c           d           h       R       ksi     S
C-C = [1393.6,  346.7,  3.4879, 2.2119, 0,      1.5724e-7,  0.72751,3.8049e+4,  4.3484, -0.57058,   1.8,    1.0,    2.1]
Si-Si = [1830.8, 471.18, 2.479, 1.7322, 0,      1.1e-6,     0.78734,1.0039e+5,  16.217, -0.59825,   2.7,    1.0,    3.3]
Si-Si = [0.0,   0.0,    0.0,    0.0,    0.0,    0.0,        0.0,    0.0,        0.0,        0.0,    0.0,    0.9776, 0.0]
Ge-Si = [0.0,   0.0,    0.0,    0.0,    0.0,    0.0,        0.0,    0.0,        0.0,        0.0,    0.0,    1.00061,0.0]