Observation of an unidentified phonon peak in SiGe alloys and superlattices using molecular dynamics simulation

S. Y.Y. Chung, M. Tomita, R. Yokogawa, A. Ogura, T. Watanabe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Molecular dynamics was applied to a variety of SiGe alloys and superlattice structures in order to investigate the production of an unidentified phonon mode. The mode in question, observed in the resulting phonon dispersion relations, was produced around 2.5 - 5 THz. The corresponding spectral energy density data for the SiGe alloys produced varying intensities around this region, with a higher intensity tending towards lower thermal conductivity values. The unidentified mode was produced by the alloy and the non-periodic superlattice structures, whereas in the case of the periodic superlattices, the mode is less conspicuous. Regarding the SiGe compound, the mode was not produced. It is concluded that the atomic disorder within the alloys and non-periodic superlattices induce a stronger intensity of the unidentified mode.

Original languageEnglish
Title of host publicationPRiME 2020
Subtitle of host publicationSiGe, Ge, and Related Compounds: Materials, Processing, and Devices 9
EditorsQ. Liu, J. M. Hartmann, J. R. Holt, X. Gong, V. Jain, G. Niu, G. Masini, A. Ogura, S. Miyazaki, M. Ostling, W. Bi, A. Schulze, A. Mai
PublisherIOP Publishing Ltd.
Pages533-546
Number of pages14
Edition5
ISBN (Electronic)9781607689003
DOIs
Publication statusPublished - 2020
EventPacific Rim Meeting on Electrochemical and Solid State Science 2020, PRiME 200 - Honolulu, United States
Duration: 2020 Oct 42020 Oct 9

Publication series

NameECS Transactions
Number5
Volume98
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

ConferencePacific Rim Meeting on Electrochemical and Solid State Science 2020, PRiME 200
Country/TerritoryUnited States
CityHonolulu
Period20/10/420/10/9

ASJC Scopus subject areas

  • Engineering(all)

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