Isotope dependence of the lowest direct energy gap in crystalline germanium

G. Davies, E. C. Lightowlers, T. S. Hui, V. Ozhogin, K. M. Itoh, W. L. Hansen, E. E. Haller

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Using optical absorption measurements we establish that the lowest direct energy gap changes with atomic mass number m at the rate dE/dm=0.49+or-0.03 meV at 2 K, decreasing to 0.11+or-0.03 meV at 300 K, in both isotopically pure and isotopically disordered germanium. These values are broadly consistent with a simple prediction from the measured temperature dependence of the gap and the known dependence of the lattice on the isotope. We confirm, from optical absorption data, that the lowest indirect energy gap of germanium increases at the rate dE/dm=0.36+or-0.01 meV, in agreement with recent photoluminescence data.

Original languageEnglish
Article number028
Pages (from-to)2201-2204
Number of pages4
JournalSemiconductor Science and Technology
Issue number12
Publication statusPublished - 1993
Externally publishedYes

ASJC Scopus subject areas

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


Dive into the research topics of 'Isotope dependence of the lowest direct energy gap in crystalline germanium'. Together they form a unique fingerprint.

Cite this