Comparison of exciton-biexciton with bound exciton-biexciton dynamics in GaN: Quantum beats and temperature dependence of the acoustic-phonon interaction

The polarization dependence of biexcitonic signals and quantum beats between A-excitons (XA) and A-biexcitons (XAXA) 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: t...

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Bibliografiska uppgifter
Huvudupphovsmän: Kyhm, K, Taylor, R, Ryan, J, Aoki, T, Kuwata-Gonokami, M, Beaumont, B, Gibart, P
Materialtyp: Journal article
Språk:English
Publicerad: 2001
Beskrivning
Sammanfattning:The polarization dependence of biexcitonic signals and quantum beats between A-excitons (XA) and A-biexcitons (XAXA) 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 XA and XAXA, and agrees well with the calculated XAXA binding energy; while the second beating period corresponds to that between XA and donor bound excitons (D0X). The temperature-dependent homogeneous linewidth shows that the D0X has a larger acoustic phonon coupling coefficient than the XAXA. We also measured the polarization dependent B-biexciton (XBXB) signal. The effective masses for the A- and B-hole were deduced from the binding energy.