Abstract
Absorption line shapes associated with the stretch mode of bond-center hydrogen (HBC (+)) at 1794 cm-1 and the twofold degenerate mode of hydrogen near the tetrahedral site (H(-)) at 745 cm-1 in germanium are measured with infrared-absorption spectroscopy. The HBC (+) 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 7.8±0.2 ps observed for the same defect in silicon [M. Budde et al, Phys. Rev. Lett. 85, 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 745-cm-1 lines as a function of temperature. These measurements are analyzed using a recently formulated exchange model for vibrational dephasing. The temperature dependence of the 1794-cm-1 line shape is attributed to thermal fluctuations in the occupation number of a pseudolocalized mode at 75±2 cm-1.
| Original language | English |
|---|---|
| Article number | 035214 |
| Pages (from-to) | 352141-352149 |
| Number of pages | 9 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 65 |
| Issue number | 3 |
| Publication status | Published - Jan 15 2002 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Vibrational dynamics of isolated hydrogen in germanium. / Tolk, N. H.; Parks Cheney, C.; Budde, M.; Lüpke, G.; Feldman, Leonard C.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 65, No. 3, 035214, 15.01.2002, p. 352141-352149.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Vibrational dynamics of isolated hydrogen in germanium
AU - Tolk, N. H.
AU - Parks Cheney, C.
AU - Budde, M.
AU - Lüpke, G.
AU - Feldman, Leonard C
PY - 2002/1/15
Y1 - 2002/1/15
N2 - Absorption line shapes associated with the stretch mode of bond-center hydrogen (HBC (+)) at 1794 cm-1 and the twofold degenerate mode of hydrogen near the tetrahedral site (H(-)) at 745 cm-1 in germanium are measured with infrared-absorption spectroscopy. The HBC (+) 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 7.8±0.2 ps observed for the same defect in silicon [M. Budde et al, Phys. Rev. Lett. 85, 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 745-cm-1 lines as a function of temperature. These measurements are analyzed using a recently formulated exchange model for vibrational dephasing. The temperature dependence of the 1794-cm-1 line shape is attributed to thermal fluctuations in the occupation number of a pseudolocalized mode at 75±2 cm-1.
AB - Absorption line shapes associated with the stretch mode of bond-center hydrogen (HBC (+)) at 1794 cm-1 and the twofold degenerate mode of hydrogen near the tetrahedral site (H(-)) at 745 cm-1 in germanium are measured with infrared-absorption spectroscopy. The HBC (+) 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 7.8±0.2 ps observed for the same defect in silicon [M. Budde et al, Phys. Rev. Lett. 85, 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 745-cm-1 lines as a function of temperature. These measurements are analyzed using a recently formulated exchange model for vibrational dephasing. The temperature dependence of the 1794-cm-1 line shape is attributed to thermal fluctuations in the occupation number of a pseudolocalized mode at 75±2 cm-1.
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M3 - Article
VL - 65
SP - 352141
EP - 352149
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 3
M1 - 035214
ER -