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Effect of hydrostatic pressure on the HgTe optical phonon

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
54
Issue
5
Identifiers
DOI: 10.1016/0038-1098(85)90943-3

Abstract

Abstract We have measured the reflectivity from 20–240cm −1 of HgTe samples at 80 K and below as a function of hydrostatic pressure to 8 kbars. The transverse optical phonon frequency was determined from a Kramers-Kronig analysis of the data. For three samples of different doping levels we find dω TO / dp = 0.34 cm −1 kbar −1. The Gruneissen's parameter, γ = 1.2, is typical of values for zincblende crystals indicating that the phonon is not influenced by the narrow gap and inverted band structure. The defect oscillator at 107 cm −1 is observed to be independent of pressure. This appears inconsistent with its identification as a phonon difference mode.

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