Effects of finite spin-orbit splitting on optical properties of spherical semiconductor quantum dots. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 1996

Effects of finite spin-orbit splitting on optical properties of spherical semiconductor quantum dots.

Résumé

The multiband envelope-function formalism—of which a convenient, analytical formulation is presented—is used to investigate the energies and wave functions of valence-band levels in spherical nanocrystallites of several III-V and II-VI compound semiconductors with finite spin-orbit splitting energy Δ. Interband absorption spectra are deduced. A significant influence of the split-off band is found even in cases where Δ is large, as for CdTe. In fact, Δ is not a decisive criterion for the strength of couplings; Luttinger parameters play a major role. Numerical results are presented for size-distributed crystallites of various binaries (CdTe, CdSe, CdS, GaAs, InP). These are analyzed in terms of the accuracy of measuring the sizes from absorption spectra by using a fitting procedure, and of performing size-selective excitation of photoluminescence. It is also found that optical transitions between the ground valence- and conduction-band levels may be forbidden, due to incompatible symmetries. Calculations neglecting the influence of the split-off band are unable to account for this property, which strongly affects photoluminescence mechanisms.
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hal-01179203 , version 1 (22-07-2015)

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Tristan Richard, Pierre Lefebvre, Henry Mathieu, Jacques Allègre. Effects of finite spin-orbit splitting on optical properties of spherical semiconductor quantum dots.. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 1996, 53 (11), pp.7287. ⟨10.1103/PhysRevB.53.7287⟩. ⟨hal-01179203⟩
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