Coherent confined LO phonons in 70Ge/74Ge isotope superlattices generated by ultrafast laser pulses

M. Nakajima, H. Harima, K. Morita, K. M. Itoh, K. Mizoguchi, E. E. Haller

研究成果: Article

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Generation of high-order coherent confined LO phonon modes by 20-fs ultrashort laser pulse irradiation was observed in a new class of nonpolar semiconductors; 70Ge/74Ge isotope superlattices. The phonon oscillations were Fourier transformed and compared with a theoretical calculation based on a planar force-constant model and a bond polarizability approach. The comparison between the calculated and Fourier transformed spectra shows clearly that the amplitudes of coherent phonons are determined solely by the degree of the atomic displacement and that only the Raman active odd-number-order modes are observable. The spectra taken with variety of polarization of pump beam show clearly that the generation mechanism of coherent phonons in nonpolar semiconductor like Ge is stimulated Raman scattering.

元の言語English
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
63
発行部数16
DOI
出版物ステータスPublished - 2001 1 1

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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