Infrared Absorption in Mg2Ge

Date
1966
Authors
Lott, L.
Lynch, David
Lynch, David
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Physics and Astronomy
Organizational Unit
Journal Issue
Series
Department
Physics and Astronomy
Abstract

Optical-absorption measurements on n- and p-type Mg2Ge single crystals were made at wavelengths between 1.5 and 25 μ at temperatures between 4.2 and 300°K. The absorption edge in p-type crystals arises from allowed indirect transitions. The energy gap is 0.570 eV at 0°K and the phonon involved has an energy of 0.025 eV. At higher temperatures the temperature dependence of the energy gap is -1.8×10−4 eV/deg. At longer wavelengths p-type crystals exhibit absorption bands interpreted as being caused by transitions between three valence bands at the center of the Brillouin zone as in germanium. The spin-orbit splitting of these bands is 0.20 eV and the ratio of heavy-hole mass to light-hole mass is 6±1. The n-type samples have an absorption band at 0.58 eV (0°K) of uncertain origin, and λ2.5 free-carrier absorption, indicating optical-mode scattering.

Comments

This article is from Physical Review 141 (1966): 681, doi:10.1103/PhysRev.141.681. Posted with permission.

Description
Keywords
Citation
DOI
Collections