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

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

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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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.

Original languageEnglish
JournalOptics Express
Volume27
Issue number3
Pages (from-to)3618-3628
Number of pages11
ISSN1094-4087
DOIs
Publication statusPublished - 2019

Cite this

@article{c771e84dfb714203a6160ed84fde5b14,
title = "Terahertz time-domain spectroscopy of zone-folded acoustic phonons in 4H and 6H silicon carbide",
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.",
author = "Tarekegne, {Abebe T.} and Binbin Zhou and Korbinian Kaltenecker and Krzysztof Iwaszczuk and Stewart Clark and Jepsen, {Peter Uhd}",
year = "2019",
doi = "10.1364/OE.27.003618",
language = "English",
volume = "27",
pages = "3618--3628",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
number = "3",

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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.

In: Optics Express, Vol. 27, No. 3, 2019, p. 3618-3628.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Terahertz time-domain spectroscopy of zone-folded acoustic phonons in 4H and 6H silicon carbide

AU - Tarekegne, Abebe T.

AU - Zhou, Binbin

AU - Kaltenecker, Korbinian

AU - Iwaszczuk, Krzysztof

AU - Clark, Stewart

AU - Jepsen, Peter Uhd

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

U2 - 10.1364/OE.27.003618

DO - 10.1364/OE.27.003618

M3 - Journal article

VL - 27

SP - 3618

EP - 3628

JO - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 3

ER -