Reference : Isotope splitting of the zero-phonon line of Fe2+ in cubic III-V semiconductors |

Scientific journals : Article | |||

Physical, chemical, mathematical & earth Sciences : Physics | |||

http://hdl.handle.net/2268/23955 | |||

Isotope splitting of the zero-phonon line of Fe2+ in cubic III-V semiconductors | |

English | |

Colignon, David [Université de Liège - ULg > Physique > Physique Théorique et Physique des Semiconducteurs > >] | |

Mailleux, Éric [Université de Liège - ULg > Physique > Physique Théorique et Physique des Semiconducteurs > >] | |

Kartheuser, Eduard [Université de Liège - ULg > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences) >] | |

Rodriguez, Sergio [Purdue University - Purdue > Physics > > >] | |

Villeret, Murielle [City University London > Mathematics > > >] | |

1998 | |

Solid State Communications | |

Pergamon Press - An Imprint of Elsevier Science | |

105 | |

4 | |

205-209 | |

Yes (verified by ORBi) | |

International | |

0038-1098 | |

[en] A theoretical study of the isotopic-mass dependence of the internal transitions of Fe2+ at a cation site in a cubic zinc-blende semiconductor is presented. The model used is based on crystal-field theory and includes the spin-orbit interaction and a weak dynamic Jahn-Teller coupling between the (5) Gamma(5) excited manifold of Fe2+ and a local vibrational mode (LVM) of Gamma(5) symmetry. The mass dependence of the LVM frequency is described, in the harmonic approximation, within two different limits: the rigid-cage model and a molecular model. In the rigid-cage model, the Fe2+ ion undergoes a displacement but the rest of the lattice is fixed. In this case, a simple M-1/2 dependence of the frequency is obtained and the Jahn-Teller energy, E-JT, is independent of the mass. In the molecular model, the four nearest neighbors of the magnetic ion are allowed to move and the LVM then behaves as the Gamma(5) mode of a MX4 tetrahedral molecule leading to a more complicated dependence of the frequency on the isotopic mass and to a mass-dependence of E-JT. The theoretical results obtained with these two models are compared with the observed isotopic shifts of the zero-phonon lines in InP:Fe and GaP:Fe corresponding to an optical transition between the vibronic Gamma(1) ground state and the lowest Gamma(5) state originating from the (5) Gamma(5) excited orbital multiplet. A prediction of the isotopic shifts of the zero-phonon line in GaAs:Fe is also presented. (C) 1997 Elsevier Science Ltd. | |

http://hdl.handle.net/2268/23955 | |

10.1016/S0038-1098(97)10111-9 |

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