We present transient and spectrally resolved four-wave-mixing studies on excitonic transitions in GaN with wurtzite structure. Coherent excitation of the A and B excitons results in a pronounced beating with a period of 0.520 ps, corresponding to an A-B splitting of (7.98±{}0.03) meV. A biexcitonic binding energy of (5.7±{}0.3) meV is obtained from the power spectrum of the four-wave-mixing signal.
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Zimmermann et al. (1997) studied this question.
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