Phonon Scattering at Acceptors with Γ8 Ground States in Semiconductors
The ground state of acceptors in cubic semiconductors is fourfold degenerate and the interaction with the lattice vibrations leads to the possibility of a Jahn-Teller effect1, causing a dynamical splitting of the electronic levels. However, due to the extended nature of the wavefunction of the defect, random internal fields may have dominant influence to destroy the J.T. effect. Such an influence should be smaller for deeper acceptors, where the wavefunctions are more concentrated.
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