Effects of isotope disorder on phonons in germanium determined from bound exciton luminescence

G. Davies; J. Hartung; V. Ozhogin; K. Itoh; W. L. Hansen; E. E. Haller

doi:10.1088/0268-1242/8/1/021

Effects of isotope disorder on phonons in germanium determined from bound exciton luminescence

G. Davies, J. Hartung, V. Ozhogin, K. Itoh, W. L. Hansen, E. E. Haller

Research output: Contribution to journal › Article

13 Citations (Scopus)

Abstract

The effects of isotope disorder on the energies of the transverse acoustic (TA^L), longitudinal acoustic (LA^L) and transverse optical (TO^L) phonons at the L point have been investigated using the luminescence of excitons bound to copper acceptors. In a sample with approximately equal ⁷⁰Ge and ⁷⁸Ge the TO^L phonon is 0.14+or-0.03 meV higher in energy than expected for a crystal of the same mean atomic mass, while the LA^L phonon is 0.07+or-0.03 meV lower in energy; the TO^L phonon is also broadened by 0.4 meV. In this disordered sample the Cu no-phonon line is 0.05+or-0.02 meV higher than expected.

Original language	English
Article number	021
Pages (from-to)	127-130
Number of pages	4
Journal	Semiconductor Science and Technology
Volume	8
Issue number	1
DOIs	https://doi.org/10.1088/0268-1242/8/1/021
Publication status	Published - 1993 Dec 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering
Materials Chemistry

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abstract = "The effects of isotope disorder on the energies of the transverse acoustic (TAL), longitudinal acoustic (LAL) and transverse optical (TOL) phonons at the L point have been investigated using the luminescence of excitons bound to copper acceptors. In a sample with approximately equal 70Ge and 78Ge the TOL phonon is 0.14+or-0.03 meV higher in energy than expected for a crystal of the same mean atomic mass, while the LAL phonon is 0.07+or-0.03 meV lower in energy; the TOL phonon is also broadened by 0.4 meV. In this disordered sample the Cu no-phonon line is 0.05+or-0.02 meV higher than expected.",

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T1 - Effects of isotope disorder on phonons in germanium determined from bound exciton luminescence

AU - Davies, G.

AU - Hartung, J.

AU - Ozhogin, V.

AU - Itoh, K.

AU - Hansen, W. L.

AU - Haller, E. E.

PY - 1993/12/1

Y1 - 1993/12/1

N2 - The effects of isotope disorder on the energies of the transverse acoustic (TAL), longitudinal acoustic (LAL) and transverse optical (TOL) phonons at the L point have been investigated using the luminescence of excitons bound to copper acceptors. In a sample with approximately equal 70Ge and 78Ge the TOL phonon is 0.14+or-0.03 meV higher in energy than expected for a crystal of the same mean atomic mass, while the LAL phonon is 0.07+or-0.03 meV lower in energy; the TOL phonon is also broadened by 0.4 meV. In this disordered sample the Cu no-phonon line is 0.05+or-0.02 meV higher than expected.

AB - The effects of isotope disorder on the energies of the transverse acoustic (TAL), longitudinal acoustic (LAL) and transverse optical (TOL) phonons at the L point have been investigated using the luminescence of excitons bound to copper acceptors. In a sample with approximately equal 70Ge and 78Ge the TOL phonon is 0.14+or-0.03 meV higher in energy than expected for a crystal of the same mean atomic mass, while the LAL phonon is 0.07+or-0.03 meV lower in energy; the TOL phonon is also broadened by 0.4 meV. In this disordered sample the Cu no-phonon line is 0.05+or-0.02 meV higher than expected.

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