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Terahertz time-domain spectroscopy of zone-folded acoustic phonons in 4H and 6H silicon carbide

Tarekegne, Abebe T.; Zhou, Binbin; Kaltenecker, Korbinian; Iwaszczuk, Krzysztof; Clark, Stewart; Jepsen, Peter Uhd

Terahertz time-domain spectroscopy of zone-folded acoustic phonons in 4H and 6H silicon carbide Thumbnail


Authors

Abebe T. Tarekegne

Binbin Zhou

Korbinian Kaltenecker

Krzysztof Iwaszczuk

Peter Uhd Jepsen



Abstract

We investigate the dielectric properties of the 4H and 6H polytypes of silicon carbide in the 0.1-19 THz range, below the fundamental transverse-optical phonons. Folding of the Brillouin zone due to the specific superlattice structure of the two polytypes leads to activation of acoustic phonon modes. We use a combination of ultrabroadband terahertz time-domain spectroscopy and simulations based on density-functional perturbation theory to observe and characterize these modes, including band splitting due to the dissimilar carbon and silicon sublattices of the structures, and an indirect measurement of the anisotropic sound velocities in the two polytypes.

Citation

Tarekegne, A. T., Zhou, B., Kaltenecker, K., Iwaszczuk, K., Clark, S., & Jepsen, P. U. (2019). Terahertz time-domain spectroscopy of zone-folded acoustic phonons in 4H and 6H silicon carbide. Optics Express, 27(3), 3618-3628. https://doi.org/10.1364/oe.27.003618

Journal Article Type Article
Acceptance Date Jan 23, 2019
Online Publication Date Jan 31, 2019
Publication Date Feb 4, 2019
Deposit Date Feb 1, 2019
Publicly Available Date Feb 5, 2019
Journal Optics Express
Publisher Optica
Peer Reviewed Peer Reviewed
Volume 27
Issue 3
Pages 3618-3628
DOI https://doi.org/10.1364/oe.27.003618
Public URL https://durham-repository.worktribe.com/output/1338438

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Copyright Statement
Published under the terms of the OSA Open Access Publishing Agreement © 2019 Optical Society of America.





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