Vibrational dynamics of isolated hydrogen in germanium

C. Parks Cheney, M. Budde, G. Lüpke, L. C. Feldman, N. H. Tolk

Research output: Contribution to journalArticlepeer-review


Absorption line shapes associated with the stretch mode of bond-center hydrogen (formula presented) at (formula presented) and the twofold degenerate mode of hydrogen near the tetrahedral site (formula presented) at (formula presented) in germanium are measured with infrared-absorption spectroscopy. The (formula presented) line shape measured at 10 K for the case of low hydrogen concentrations gives a lifetime between 15 and 23 ps. Similar in magnitude to the (formula presented) observed for the same defect in silicon [M. Budde et al, Phys. Rev. Lett. (formula presented) 1452 (2000)], this observation indicates that the lifetime of the bond-centered mode is largely insensitive to the phonon frequency distributions of the host material. Pure dephasing dynamics of hydrogen in germanium are studied by measuring the shape of the 1794- and (formula presented) lines as a function of temperature. These measurements are analyzed using a recently formulated exchange model for vibrational dephasing. The temperature dependence of the (formula presented) line shape is attributed to thermal fluctuations in the occupation number of a pseudolocalized mode at (formula presented).

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number3
Publication statusPublished - 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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