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Comparison of Exciton–Biexciton with Bound Exciton–Biexciton Dynamics in GaN: Quantum Beats and Temperature Dependence of the Acoustic‐Phonon Interaction
Author(s) -
Kyhm K.,
Taylor R.A.,
Ryan J.F.,
Aoki T.,
KuwataGonokami M.,
Beaumont B.,
Gibart P.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200111)228:2<475::aid-pssb475>3.0.co;2-6
Subject(s) - biexciton , exciton , binding energy , phonon , laser linewidth , condensed matter physics , physics , quantum beats , polarization (electrochemistry) , atomic physics , quantum , chemistry , quantum mechanics , laser
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.