Abstract
We have investigated fine structure splitting of indirect excitons in ultrapure diamond by high-resolution spectroscopy. The role of the mass-anisotropy splitting has been revealed by comparison with group-theoretical calculations of the reduced matrix elements for phonon scattering of electrons and holes followed by the radiative recombination. The observed energy levels and coupling strengths of the fine structure states are successfully reproduced by inclusion of the mass-anisotropy splitting in addition to the exchange and spin-orbit interactions.
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