论文信息 - Time-resolved four-wave mixing studies of excitons in GaN

Time-resolved four-wave mixing studies of excitons in GaN

Quantum beats in the time-resolved four-wave mixing (FWM) signals arising from GaN excitons are observed. Two different types of beats are investigated: beats between the A-exciton (X A ) and B-exciton (X B ) states; beats between the X A and A-biexciton ((XX A )) states. The former exhibits oscillations along all directions in the delay- (r) and real-time (t) plane while the latter exhibits no beat in the direction parallel to the diagonal axis (τ = t). The results are well reproduced by a model calculation, showing good homogeneity of the sample.

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