Jahn-Teller splitting and Zeeman effect of acceptors in diamond

Abstract

Employing the high resolution of a 5+4 tandem Fabry-Pérot interferometer, we discovered that Δ' , the Raman active electronic transition between the spin-orbit split 1s(p_3/2) : Γ ₈ and 1s(p_1/2) : Γ₇ acceptor ground states, is a doublet for a boron impurity in diamond with a clearly resolved spacing of 0.81± 0.15 cm^-1. The direct observation of a Stokes/anti-Stokes pair with 0.80± 0.04 cm^-1 shift provides a striking confirmation that the lower 1s(p_3/2) : Γ ₈ ground state has experienced a splitting due to a static Jahn-Teller distortion. The Zeeman effect of Δ' has been investigated with a magnetic field along several crystallographic directions. Theory of the Zeeman effect, formulated in terms of the symmetry of the substitutional acceptor and the Luttinger parameters of the valence band, allows quantitative predictions of the relative intensities of the Zeeman components in full agreement with experiments. The observation of transitions within the Γ₈ Zeeman multiplet, i.e., the Raman-electron-paramagnetic-resonances, is yet another novel feature to emerge from the present study. The investigation has also yielded g-factors characterizing the Zeeman multiplets.