Comparison of Exciton–Biexciton with Bound Exciton–Biexciton Dynamics in GaN: Quantum Beats and Temperature Dependence of the Acoustic-Phonon Interaction
✍ Scribed by K. Kyhm; R.A. Taylor; J.F. Ryan; T. Aoki; M. Kuwata-Gonokami; B. Beaumont; P. Gibart
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 108 KB
- Volume
- 228
- Category
- Article
- ISSN
- 0370-1972
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✦ Synopsis
The polarization dependence of biexcitonic signals and quantum beats between A-excitons (X A ) and A-biexcitons (X A X A ) in a high-quality GaN epilayer is measured by spectrally-resolved and time-integrated four-wave mixing. With cross-linear polarised light, mixed beats with two periods are observed: the first beating period corresponds to the energy splitting between X A and X A X A , and agrees well with the calculated X A X A binding energy; while the second beating period corresponds to that between X A and donor bound excitons (D 0 X). The temperature-dependent homogeneous linewidth shows that the D 0 X has a larger acoustic phonon coupling coefficient than the X A X A . We also measured the polarization dependent B-biexciton (X B X B ) signal. The effective masses for the A-and B-hole were deduced from the binding energy.