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pair_tersoff_zbl.tex
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rLAMMPS lammps
pair_tersoff_zbl.tex
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\documentclass
[12pt]
{
article
}
\begin
{
document
}
\begin
{
eqnarray*
}
E
&
=
&
\frac
{
1
}{
2
}
\sum
_
i
\sum
_{
j
\neq
i
}
V
_{
ij
}
\\
V
_{
ij
}
&
=
&
(1 - f
_
F(r
_{
ij
}
)) V
^{
ZBL
}_{
ij
}
+ f
_
F(r
_{
ij
}
) V
^{
Tersoff
}_{
ij
}
\\
f
_
F(r
_{
ij
}
)
&
=
&
\frac
{
1
}{
1 + e
^{
-A
_
F(r
_{
ij
}
- r
_
C)
}}
\\
\\
\\
V
^{
ZBL
}_{
ij
}
&
=
&
\frac
{
1
}{
4
\pi\epsilon
_
0
}
\frac
{
Z
_
1 Z
_
2
\,
e
^
2
}{
r
_{
ij
}}
\phi
(r
_{
ij
}
/a)
\\
a
&
=
&
\frac
{
0.8854
\,
a
_
0
}{
Z
_{
1
}^{
0.23
}
+ Z
_{
2
}^{
0.23
}}
\\
\phi
(x)
&
=
&
0.1818e
^{
-3.2x
}
+ 0.5099e
^{
-0.9423x
}
+ 0.2802e
^{
-0.4029x
}
+ 0.02817e
^{
-0.2016x
}
\\
\\
\\
V
^{
Tersoff
}_{
ij
}
&
=
&
f
_
C(r
_{
ij
}
)
\left
[ f_R(r_{ij}) + b_{ij} f_A(r_{ij}) \right]
\\
f
_
C(r)
&
=
&
\left\{
\begin
{
array
}
{
r@
{
\quad
:
\quad
}
l
}
1
&
r < R - D
\\
\frac
{
1
}{
2
}
-
\frac
{
1
}{
2
}
\sin
\left
(
\frac
{
\pi
}{
2
}
\frac
{
r-R
}{
D
}
\right
)
&
R-D < r < R + D
\\
0
&
r > R + D
\end
{
array
}
\right
.
\\
f
_
R(r)
&
=
&
A
\exp
(-
\lambda
_
1 r)
\\
f
_
A(r)
&
=
&
-B
\exp
(-
\lambda
_
2 r)
\\
b
_{
ij
}
&
=
&
\left
( 1 +
\beta
^
n
{
\zeta
_{
ij
}}^
n
\right
)
^{
-
\frac
{
1
}{
2n
}}
\\
\zeta
_{
ij
}
&
=
&
\sum
_{
k
\neq
i,j
}
f
_
C(r
_{
ik
}
) g(
\theta
_{
ijk
}
)
\exp
\left
[ {\lambda_3}^m (r_{ij} - r_{ik})^m \right]
\\
g(
\theta
)
&
=
&
\gamma
_{
ijk
}
\left
( 1 +
\frac
{
c
^
2
}{
d
^
2
}
-
\frac
{
c
^
2
}{
\left
[ d
^
2 +
(
\cos
\theta
-
\cos
\theta
_
0)
^
2
\right
]
}
\right
)
\end
{
eqnarray*
}
\end
{
document
}
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