Exciton–Exciton Interactions in Tensile-Strained GaN

• Yasunori Toda

• Kyohhei Shigematsu

• Akira Hasegawa

• Satoru Adachi

抄録

We report on the four-wave mixing (FWM) spectroscopy of excitons in tensile-strained GaN films. Three excitonic resonances (A-, B-, and C-excitons) were clearly observed with energy separations of Δ AB ∼4.7 meV and Δ BC ∼14.5 meV. Owing to tensile strain, these values are much smaller than those of free-standing GaN, allowing the simultaneous excitations of A–B and B–C excitons pairs. The time evolutions of the FWM in different polarization configurations resolved the differences in the simultaneous excitonic transitions; the excitation of A–B excitons showed an oscillation with a critical π-phase shift in the orthogonal polarization configuration as expected in the quantum beat, and the oscillation of B–C excitons pair is independent of the polarization configuration, indicating polarization interference. The polarization-dependent FWM spectra of A–B excitons revealed peaks associated with biexciton transitions with binding energies of E AA = 4.6 meV, E AB = 2.1 meV, and E BB = 1.7 meV.

収録刊行物

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 52 (8S), 08JL03-, 2013-05-20

  IOP Publishing

キーワード

• General Physics and Astronomy
• General Engineering

詳細情報

• CRID: 1360003449887614080
• NII論文ID: 210000142728
• DOI: 10.7567/jjap.52.08jl03
• ISSN: 13474065
• ISSN: 00214922
• Web Site: https://iopscience.iop.org/article/10.7567/JJAP.52.08JL03
• Web Site: https://iopscience.iop.org/article/10.7567/JJAP.52.08JL03/pdf
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