Inelastic X-ray scattering measurements of III–V multiple quantum wells

Inelastic X-ray scattering (IXS) on an In 0.17 Ga 0.83 As/ GaAs 0.8 P 0.2 multiple quantum well (MQW) superlattice has been conducted to investigate the potential for phonon bottlenecks in low dimensional materials. This work shows that the measured spectra are in good agreement with an adiabatic bo...

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Bibliographic Details
Published in:Applied physics letters 2017-01, Vol.110 (4)
Main Authors: Xia, Hongze, Patterson, Robert, Smyth, Suntrana, Feng, Yu, Chung, Simon, Zhang, Yi, Shrestha, Santosh, Huang, Shujuan, Uchiyama, Hiroshi, Tsutsui, Satoshi, Sugiyama, Masakazu, Baron, Alfred Q. R., Conibeer, Gavin
Format: Article
Language:English
Subjects:
Applied physics
Inelastic scattering
Phonons
Quantum wells
Superlattices
X ray spectra
X-ray scattering
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Summary:Inelastic X-ray scattering (IXS) on an In 0.17 Ga 0.83 As/ GaAs 0.8 P 0.2 multiple quantum well (MQW) superlattice has been conducted to investigate the potential for phonon bottlenecks in low dimensional materials. This work shows that the measured spectra are in good agreement with an adiabatic bond charge model prediction and back-folded phonon modes make large contributions to the broadening of peaks observed in the spectra. The high-lying mode at 45 meV in the MQW is attributed to vibrations of Ga and P and confirmed by both experiment and theory. The acoustic phonons have a dominant contribution from the Ga and As components, and the contribution from InAs is small and only visible at around 29.7 meV. Low energy optical modes resulting from back-folding might be a key to increased electron-phonon coupling in the material system. The suitability of utilizing IXS as a means to investigate phonon modes in low dimensional materials is also discussed.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4974478