Semi-flexible Trimers on the Square Lattice in the Full Lattice Limit

Trimers are chains formed by two lattice edges, and therefore three monomers. We consider trimers placed on the square lattice, edges belonging to same trimer either colinear, forming a straight rod with unitary statistical weight, or perpendicular, weight $\omega$ being associated these angular trimers. The thermodynamic properties of this model studied in full limit, where all sites occupied monomers In particular, we use transfer matrix techniques estimate entropy system as function $\omega$. $s(\omega)$ is maximum at $\omega=1$ our results compared earlier studies literature for ($\omega=0$), ($\omega \to \infty$) mixtures equiprobable ($\omega=1$).