Building up a face centered cubic lattice

• Consider:

1. a cubic simulation box whose sides are of length $\left.L\right.$
2. a number of lattice positions, $\left.M\right.$ given by $\left.M=4m^{3}\right.$,

with $m$ being a positive integer

• The $\left.M\right.$ positions are those given by:

$\left\{{\begin{array}{l}x_{a}=i_{a}\times (\delta l)\\y_{a}=j_{a}\times (\delta l)\\z_{a}=k_{a}\times (\delta l)\end{array}}\right\}$

where the indices of a given valid site are an integer number that must fulfill the following criteria

• $0\leq i_{a}<m$
• $0\leq j_{a}<m$
• $0\leq k_{a}<m$,
• the sum of $\left.i_{a}+j_{a}+k_{a}\right.$ must be, for instance, an even number.

with $\left.\delta l=L/(2m)\right.$