Temperature effects on the highly correlated electron gas of a Si-111(1 × 1) surface

The effects of the temperature on the highly correlated two-dimensional electron gas of a Si-111(1 × 1) surface have been analysed within a Hubbard Hamiltonian, going beyond the Hartree-Fock approximation. Our results show that a Kondo-like peak appearing at low T, disappears around 700 K; moreover, we find that the surface chemical potential shifts towards the valence band. All these results offer an explanation to recent experimental data of Yokotsuka et al.