Raman spectra of Ge/Ge isotope heterostructures with argon 488 and 514.5 nm excitations
نویسندگان
چکیده
Raman spectra of Ge/Ge isotope bi-layer structures recorded with 488 and 514.5 nm Ar laser excitations are reported. The relative amplitudes of the Ge and Ge confined optical phonon peaks differ significantly for the two excitations at T 1⁄4 10K, while it is almost the same for the spectra recorded at 300K. Possible interpretations of our results are provided considering the laser penetration depths and the isotope effect on the electronic resonance Raman frequency. r 2002 Elsevier Science B.V. All rights reserved.
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