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

Journal Article · Sun May 15 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.14244· OSTI ID:7207426

Parks, C; Ramdas, A K; Rodriguez, S ^[1]; Itoh, K M; Haller, E E ^[2]

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1. Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States)
2. Lawrence Berkeley Laboratory and University of California at Berkeley, Berkeley, California 94720 (United States)

The piezomodulated and photomodulated reflectivity spectra of monoisotopic Ge ([sup 70]Ge, [sup 73]Ge, [sup 74]Ge, [sup 76]Ge) and natural Ge measured at [ital T]=6 K show clear signatures of the [ital E][sub 0] and the [ital E][sub 0]+[Delta][sub 0] 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.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7207426
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:20; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
COUPLING
ELECTRON-PHONON COUPLING
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPANSION
GERMANIUM
GERMANIUM 70
GERMANIUM 73
GERMANIUM 74
GERMANIUM 76
GERMANIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE EFFECTS
ISOTOPES
LATTICE PARAMETERS
LUMINESCENCE
METALS
MILLISEC LIVING RADIOISOTOPES
NUCLEI
OPTICAL PROPERTIES
PHOTOLUMINESCENCE
PHYSICAL PROPERTIES
RADIOISOTOPES
REFLECTIVITY
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
THERMAL EXPANSION