Surface electronic band structure and temperature dependence of the surface state at A ¯ on Mg ( 10 1 ¯ 0 ) surface

The surface electronic structure of the $\text{Mg}(10\overline{1}0)$ surface has been investigated by angle-resolved photoemission around the high-symmetry point $\overline{A}$, where two $sp$ Shockley surface states, S1 and S2, have been measured to have the binding energies at $\overline{A}$ of 0.58 and 1.10 eV. The effective mass, ${\text{m}}^{\ensuremath{\ast}}/\text{m}$, of the two surface-state dispersions were determined to be 0.85 and 1.01. First-principles calculations for the S1 and S2 surface states have been performed and show results consistent with experiment. The temperature dependence, the binding energy, and the linewidth of these two surface states were found to be strongly correlated with the bulk. Their behaviors have also been compared with the two surface states at $\overline{A}$ in $\text{Be}(10\overline{1}0)$.