Electronic band structure of isotopically pure germanium: Modulated transmission and reflectivity study

C. Parks, A. K. Ramdas, S. Rodriguez, K. M. Itoh, E. E. Haller

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

The piezomodulated and photomodulated reflectivity spectra of monoisotopic Ge (70Ge, Ge73, Ge74, Ge76) and natural Ge measured at T=6 K show clear signatures of the E0 and the E00 transitions; their energies increase with increasing isotopic mass. From a comparison of the phonon-assisted indirect transition energies obtained from electromodulated and wavelength-modulated transmission and photoluminescence, the isotopic mass dependence of both the indirect gap and the relevant zone-boundary phonons are deduced. The isotopic-mass dependence of the energy gaps is interpreted in the context of the electron-phonon interaction and the volume expansion of the crystal lattice.

Original languageEnglish
Pages (from-to)14244-14250
Number of pages7
JournalPhysical Review B
Volume49
Issue number20
DOIs
Publication statusPublished - 1994 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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