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NEAR RESONANT RAMAN SCATTERING FROM GaAs/AlAs SUPERLATTICES

HAN HE-XIANG WANG ZHAO-PING LI GUO-HUA JIANG DE-SHENG K. PLOOG

NEAR RESONANT RAMAN SCATTERING FROM GaAs/AlAs SUPERLATTICES

HAN HE-XIANG, WANG ZHAO-PING, LI GUO-HUA, JIANG DE-SHENG, K. PLOOG
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  • This article presents the results of near resonant Raman scattering measurement of GaAs/ AlAs superlattices at room temperature. A strong enhancement of GaAs LO phonon even modes resulted owing to dipole allowed Fr?hlich interaction in superlattices. Similar to the previous results, the LO phonon even modes in polarized configuration is observed. In contrast to the previous works, however, what we observed in depolarized configuration is the LO phonon odd modes instead of even modes. And it is confirmed that the selection rules of near resonant Raman scattering from LO phonons in this kind of superlattices is the same as that of off resonant scattering. From the second-order Raman scattering, it is confirmed that polarized second-order Raman scattering spectra consist of overtone and combinations of two even modes and depolarized second-order Raman scattering spectra consist of combinations of an even mode and an odd mode. Our experimental results coincide with the predictions using recently developed Huang-Zhu model. A brief discussion on interface modes and their combination with confined modes are also presented.
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  • Received Date:  24 April 1991
  • Published Online:  03 July 2005

NEAR RESONANT RAMAN SCATTERING FROM GaAs/AlAs SUPERLATTICES

  • 1. 中国科学院半导体研究所半导体超晶格国家重点实验室,北京,100083

Abstract: This article presents the results of near resonant Raman scattering measurement of GaAs/ AlAs superlattices at room temperature. A strong enhancement of GaAs LO phonon even modes resulted owing to dipole allowed Fr?hlich interaction in superlattices. Similar to the previous results, the LO phonon even modes in polarized configuration is observed. In contrast to the previous works, however, what we observed in depolarized configuration is the LO phonon odd modes instead of even modes. And it is confirmed that the selection rules of near resonant Raman scattering from LO phonons in this kind of superlattices is the same as that of off resonant scattering. From the second-order Raman scattering, it is confirmed that polarized second-order Raman scattering spectra consist of overtone and combinations of two even modes and depolarized second-order Raman scattering spectra consist of combinations of an even mode and an odd mode. Our experimental results coincide with the predictions using recently developed Huang-Zhu model. A brief discussion on interface modes and their combination with confined modes are also presented.

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