Classical Coulomb lattice gas
the Coulomb lattice gas is defined by the following interaction between particles at points Ri and Rj on the lattice:

the adimensional parameter Gamma

is the ratio between the Coulomb energy at the typical distance between particles

where rho is the density
G=1.1
 | G=1.11
 | G=2.21
 |
G=3.32
 | G=4.43
 | G=5.53
 |
G=6.65
 | G=7.75
 | G=8.86
 |