Antiferromagneticp−dexchange in ferromagneticGa1−xMnxAsepilayers

Abstract

The $s,p-d$ exchange interaction of p-type ${\mathrm{Ga}}_{1-x}{\mathrm{Mn}}_x\mathrm{As}\hspace{0.5em}\mathrm{}(x<\mathrm{}0.05\mathrm{})\mathrm{}$ epilayers is investigated by means of magnetoabsorption. The observed ferromagnetic-type splitting of fundamental absorption edge is explained by antiferromagnetic $p-d$ exchange interaction, taking into account the Moss-Burstein effect, resulting from high hole concentration.