Comparison of coherent and incoherent LO phonons in isotopic 70Ge/74Ge superlattices

M. Nakajima; K. Mizoguchi; K. Morita; K. Itoh; H. Harima; S. Nakashima

doi:10.1016/S0022-2313(99)00481-0

Comparison of coherent and incoherent LO phonons in isotopic ⁷⁰Ge/⁷⁴Ge superlattices

M. Nakajima, K. Mizoguchi, K. Morita, K. Itoh, H. Harima, S. Nakashima

Department of Applied Physics and Physico-Informatics

Research output: Contribution to journal › Conference article › peer-review

Abstract

Coherent LO phonon oscillations excited by 20-fs ultrashort laser pulses have been observed in isotopic ⁷⁰Ge/⁷⁴Ge superlattices by a pump-probe technique. Fourier-transformed spectra of the time-domain signal were compared with incoherent LO phonon spectra measured by Raman spectroscopy. The spectra of coherent phonons are quite different from the Raman spectra with common excitation wavelength. This comparison indicates that the pump-probe experiment detects the region which is different from where Raman experiment probes.

Original language	English
Pages (from-to)	942-944
Number of pages	3
Journal	Journal of Luminescence
Volume	87
DOIs	https://doi.org/10.1016/S0022-2313(99)00481-0
Publication status	Published - 2000 May
Event	International Conference on Luminescence and Optical Spectroscopy of Condensed Matter (ICL'99) - Osaka, Jpn Duration: 1999 Aug 23 → 1999 Aug 27

ASJC Scopus subject areas

Biophysics
Biochemistry
Chemistry(all)
Atomic and Molecular Physics, and Optics
Condensed Matter Physics

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title = "Comparison of coherent and incoherent LO phonons in isotopic 70Ge/74Ge superlattices",

abstract = "Coherent LO phonon oscillations excited by 20-fs ultrashort laser pulses have been observed in isotopic 70Ge/74Ge superlattices by a pump-probe technique. Fourier-transformed spectra of the time-domain signal were compared with incoherent LO phonon spectra measured by Raman spectroscopy. The spectra of coherent phonons are quite different from the Raman spectra with common excitation wavelength. This comparison indicates that the pump-probe experiment detects the region which is different from where Raman experiment probes.",

author = "M. Nakajima and K. Mizoguchi and K. Morita and K. Itoh and H. Harima and S. Nakashima",

note = "Copyright: Copyright 2017 Elsevier B.V., All rights reserved.; International Conference on Luminescence and Optical Spectroscopy of Condensed Matter (ICL'99) ; Conference date: 23-08-1999 Through 27-08-1999",

year = "2000",

month = may,

doi = "10.1016/S0022-2313(99)00481-0",

language = "English",

volume = "87",

pages = "942--944",

journal = "Journal of Luminescence",

issn = "0022-2313",

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T1 - Comparison of coherent and incoherent LO phonons in isotopic 70Ge/74Ge superlattices

AU - Nakajima, M.

AU - Mizoguchi, K.

AU - Morita, K.

AU - Itoh, K.

AU - Harima, H.

AU - Nakashima, S.

PY - 2000/5

Y1 - 2000/5

N2 - Coherent LO phonon oscillations excited by 20-fs ultrashort laser pulses have been observed in isotopic 70Ge/74Ge superlattices by a pump-probe technique. Fourier-transformed spectra of the time-domain signal were compared with incoherent LO phonon spectra measured by Raman spectroscopy. The spectra of coherent phonons are quite different from the Raman spectra with common excitation wavelength. This comparison indicates that the pump-probe experiment detects the region which is different from where Raman experiment probes.

AB - Coherent LO phonon oscillations excited by 20-fs ultrashort laser pulses have been observed in isotopic 70Ge/74Ge superlattices by a pump-probe technique. Fourier-transformed spectra of the time-domain signal were compared with incoherent LO phonon spectra measured by Raman spectroscopy. The spectra of coherent phonons are quite different from the Raman spectra with common excitation wavelength. This comparison indicates that the pump-probe experiment detects the region which is different from where Raman experiment probes.

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U2 - 10.1016/S0022-2313(99)00481-0

DO - 10.1016/S0022-2313(99)00481-0

M3 - Conference article

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SP - 942

EP - 944

JO - Journal of Luminescence

JF - Journal of Luminescence

SN - 0022-2313

T2 - International Conference on Luminescence and Optical Spectroscopy of Condensed Matter (ICL'99)

Y2 - 23 August 1999 through 27 August 1999