### 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 language | English |
---|---|

Pages (from-to) | 1-9 |

Number of pages | 9 |

Journal | Physical Review B - Condensed Matter and Materials Physics |

Volume | 65 |

Issue number | 3 |

DOIs | |

Publication status | Published - Jan 1 2002 |

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### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics

### Cite this

*Physical Review B - Condensed Matter and Materials Physics*,

*65*(3), 1-9. https://doi.org/10.1103/PhysRevB.65.035214

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

Research output: Contribution to journal › Article

*Physical Review B - Condensed Matter and Materials Physics*, vol. 65, no. 3, pp. 1-9. https://doi.org/10.1103/PhysRevB.65.035214

}

TY - JOUR

T1 - Vibrational dynamics of isolated hydrogen in germanium

AU - Parks Cheney, C.

AU - Budde, M.

AU - Lüpke, G.

AU - Feldman, Leonard C

AU - Tolk, N. H.

PY - 2002/1/1

Y1 - 2002/1/1

N2 - 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).

AB - 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).

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U2 - 10.1103/PhysRevB.65.035214

DO - 10.1103/PhysRevB.65.035214

M3 - Article

AN - SCOPUS:85038312003

VL - 65

SP - 1

EP - 9

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 3

ER -