Abstract
The lamellar semiconductors GaSe and InSe have been studied with k-resolved inverse-photoemission spectroscopy along two major symmetry directions (\ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{} K\ifmmode\bar\else\textasciimacron\fi{} and \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{} M\ifmmode\bar\else\textasciimacron\fi{}) of the surface Brillouin zone. Three bands with well-resolved features are observed from which the dispersion of the conduction bands can be determined with good precision. The minimum of the conduction band is found at M\ifmmode\bar\else\textasciimacron\fi{} in GaSe and at \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{} in InSe. These results are compared with theoretical studies using pseudopotential and tight-binding calculations.
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