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.
Original language | English |
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Article number | 021 |
Pages (from-to) | 127-130 |
Number of pages | 4 |
Journal | Semiconductor Science and Technology |
Volume | 8 |
Issue number | 1 |
DOIs | |
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