Abstract
The existence and stability of the incommensurate phase in a lattice-gas model of Si adsorbed on W(110) is studied using domain-wall arguments and the free-fermion approximation. The incommensurate phase observed in a previous Monte Carlo study is shown to be stable above both the (5\ifmmode\times\else\texttimes\fi{}1) and (6\ifmmode\times\else\texttimes\fi{}1) phases in agreement with the general prediction for (p\ifmmode\times\else\texttimes\fi{}1) phases. The commensurate-incommensurate transition lines from the ordered (5\ifmmode\times\else\texttimes\fi{}1) and (6\ifmmode\times\else\texttimes\fi{}1) phases to the incommensurate phase are calculated using the low-temperature free-fermion approximation. The results are shown to be in good qualitative agreement with results from previous Monte Carlo simulations.
Published Version
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