Using angle-resolved photoemission, we have investigated the development of the electronic structure and the Fermi level pinning in Ga1-xMnxAs with Mn concentrations in the range 1%-6%. We find that the Mn-induced changes in the valence-band spectra depend strongly on the Mn concentration, suggesting that the interaction between the Mn ions is more complex than assumed in earlier studies. The relative position of the Fermi level is also found to be concentration dependent. In particular we find that for concentrations around 3.5%-5% it is located very close to the valence-band maximum, which is in the range where metallic conductivity has been reported in earlier studies. For concentrations outside this range, larger as well as smaller, the Fermi level is found to be pinned at about 0.15 eV higher energy.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据