Article (Scientific journals)
Isotope splitting of the zero-phonon line of Fe2+ in cubic III-V semiconductors
Colignon, David; Mailleux, Éric; Kartheuser, Eduard et al.
1998In Solid State Communications, 105 (4), p. 205-209
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Abstract :
[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.
Disciplines :
Physics
Author, co-author :
Colignon, David  ;  Université de Liège - ULiège > Physique > Physique Théorique et Physique des Semiconducteurs
Mailleux, Éric;  Université de Liège - ULiège > Physique > Physique Théorique et Physique des Semiconducteurs
Kartheuser, Eduard ;  Université de Liège - ULiège > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences)
Rodriguez, Sergio;  Purdue University - Purdue > Physics
Villeret, Murielle;  City University London > Mathematics
Language :
English
Title :
Isotope splitting of the zero-phonon line of Fe2+ in cubic III-V semiconductors
Publication date :
1998
Journal title :
Solid State Communications
ISSN :
0038-1098
Publisher :
Pergamon Press - An Imprint of Elsevier Science
Volume :
105
Issue :
4
Pages :
205-209
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 28 September 2009

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