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|Title:||Acoustic phonon dispersion at hypersonic frequencies in Si and Ge|
|Authors:||Kuok, M.H. |
|Citation:||Kuok, M.H., Ng, S.C., Rang, Z.L., Lockwood, D.J. (2000-11-15). Acoustic phonon dispersion at hypersonic frequencies in Si and Ge. Physical Review B - Condensed Matter and Materials Physics 62 (19) : 12902-12908. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevB.62.12902|
|Abstract:||Brillouin spectra of the longitudinal acoustic (LA) mode, traveling along the  direction, in silicon and germanium have been recorded in 180° backscattering using 457.9-514.5-nm laser lines. The wave velocity of the LA phonon propagating in the  direction was determined at hypersonic frequencies, from the measured acoustic phonon dispersion in silicon and germanium. The elastic modulus c11 of the two semiconductors has been calculated from the respective measured hypersonic wave velocities and the results are compared with values determined from lower-frequency ultrasonic and other measurements. Interestingly, the hypersonic velocities are consistently lower by ≅1-2 % than the ultrasonic ones, but they generally agree within the present experimental accuracy.|
|Source Title:||Physical Review B - Condensed Matter and Materials Physics|
|Appears in Collections:||Staff Publications|
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