Vibrational dynamics of isolated hydrogen in germanium

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

Research output: Contribution to journalArticle

Abstract

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
Volume65
Issue number3
DOIs
Publication statusPublished - Jan 1 2002

Fingerprint

Germanium
Hydrogen
germanium
hydrogen
Infrared absorption
Silicon
line shape
Absorption spectroscopy
Infrared spectroscopy
Temperature
Defects
life (durability)
frequency distribution
occupation
infrared absorption
absorption spectroscopy
infrared spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Vibrational dynamics of isolated hydrogen in germanium. / Parks Cheney, C.; Budde, M.; Lüpke, G.; Feldman, Leonard C; Tolk, N. H.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 65, No. 3, 01.01.2002, p. 1-9.

Research output: Contribution to journalArticle

Parks Cheney, C. ; Budde, M. ; Lüpke, G. ; Feldman, Leonard C ; Tolk, N. H. / Vibrational dynamics of isolated hydrogen in germanium. In: Physical Review B - Condensed Matter and Materials Physics. 2002 ; Vol. 65, No. 3. pp. 1-9.
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