Shallow-acceptor spectral-line fine structure in germanium

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Abstract
A controlled-accuracy, high-resolution energy spectrum of the 4×4 Kohn-Luttinger Hamiltonian with a screened Coulomb impurity potential has been obtained. The calculated and measured spectra were adjusted using selected line positions. An identification of the boron spectrum reveals a complex structure for most of the lines. The identification yields the splittings in the multiplets and chemical shifts of the odd-parity excited states. An estimated splitting in the C triplet of 53 μeV is in fair agreement with the reported separation for Ge(B), Ge(Al), and Ge(In). New data on the spectroscopic values of the ground-state binding energies for nine experimentally studied acceptors are presented.