N. Akutsu et al., Vicinal surface with Langmuir adsorption: A decorated restricted solid-on-solid model - art. no. 085415, PHYS REV B, 6408(8), 2001, pp. 5415
We study the vicinal surface of the restricted solid-on-solid model coupled
with the Langmuir adsorbates that we regard as two-dimensional lattice gas
without lateral interaction. The effect of the vapor pressure of the adsor
bates in the environmental phase is taken into consideration through the ch
emical potential. We calculate the surface free energy f, the adsorption co
verage Theta, the step tension gamma, and the step stiffness <(<gamma>)over
tilde> by the transfer matrix method combined with the density-matrix algo
rithm. Detailed step-density dependence of (c)(j) and Theta is obtained. We
draw the roughening transition curve in the plane of the temperature and t
he chemical potential of adsorbates. We find the multireentrant roughening
transition accompanying the inverse roughening phenomena. We also find quas
ireentrant behavior in the step tension.