## 摘要

The optical properties of Zn_{1-x}Mn_{x}Se with x up to 0.78 grown by molecular beam epitaxy on GaAs (001) substrates are reported. The complex dielectric functions ε=ε_{1}+iε_{2} are obtained by spectroscopic ellipsometry in the photon range from 3.5 to 5.5 eV at room temperature. The critical-point energies E_{1} and E_{1}+Δ_{1} for x ≤ 0.52 are determined by fitting the calculated second-derivative spectra of ε to the standard line shape. For the sample with x = 0.78, the peak position in the ε_{2} spectrum is taken as an estimate for E_{1}. While the fundamental band gap E_{0} increases with x, the E_{1} and E_{1}+Δ_{1} energies decrease almost linearly with x. Comparing our results with those of the other experimental and theoretical studies, we consider the sp-d hybridization between the Mn 3d level and the sp band states to be an important factor affecting the band structures at the L point in the Brillouin zone over the whole range of Mn concentration.

原文 | English |
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頁（從 - 到） | 311-315 |

頁數 | 5 |

期刊 | Solid State Communications |

卷 | 120 |

發行號 | 7-8 |

DOIs | |

出版狀態 | Published - 16 十月 2001 |