Atomic mass dependency of a localized phonon mode in SiGe alloys

Using molecular dynamics, the effect of an atomic mass difference on a localized phonon mode in SiGe alloys was investigated. Phonon dispersion relations revealed that a change in atomic mass causes the optical and acoustic modes to shift frequency. The results indicate that the local mode is sensit...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Sylvia Yuk Yee Chung, Motohiro Tomita, Ryo Yokogawa, Atsushi Ogura, Takanobu Watanabe
Formato:	article
Lenguaje:	EN
Publicado:	AIP Publishing LLC 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/a8366e761b2d4418838e2340d6880597
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:a8366e761b2d4418838e2340d6880597
record_format	dspace
spelling	oai:doaj.org-article:a8366e761b2d4418838e2340d68805972021-12-01T18:52:06ZAtomic mass dependency of a localized phonon mode in SiGe alloys2158-322610.1063/5.0071699https://doaj.org/article/a8366e761b2d4418838e2340d68805972021-11-01T00:00:00Zhttp://dx.doi.org/10.1063/5.0071699https://doaj.org/toc/2158-3226Using molecular dynamics, the effect of an atomic mass difference on a localized phonon mode in SiGe alloys was investigated. Phonon dispersion relations revealed that a change in atomic mass causes the optical and acoustic modes to shift frequency. The results indicate that the local mode is sensitive to both Si and Ge atomic mass changes; reducing the Si atomic mass shifts the local mode to higher frequencies, and increasing the Ge atomic mass shifts the local mode to lower frequencies. Furthermore, the results suggest that the local mode originates from the Si–Ge bond vibration. Although the Si–Si, Si–Ge, and Ge–Ge optical mode frequencies are well approximated by the two-body harmonic oscillator model, a much heavier effective mass than that of the Si–Ge pair must be assumed to reproduce the local mode frequency. A plausible interpretation of the local mode is a collective vibration of Ge clusters embedded within the Si lattice.Sylvia Yuk Yee ChungMotohiro TomitaRyo YokogawaAtsushi OguraTakanobu WatanabeAIP Publishing LLCarticlePhysicsQC1-999ENAIP Advances, Vol 11, Iss 11, Pp 115225-115225-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Sylvia Yuk Yee Chung Motohiro Tomita Ryo Yokogawa Atsushi Ogura Takanobu Watanabe Atomic mass dependency of a localized phonon mode in SiGe alloys
description	Using molecular dynamics, the effect of an atomic mass difference on a localized phonon mode in SiGe alloys was investigated. Phonon dispersion relations revealed that a change in atomic mass causes the optical and acoustic modes to shift frequency. The results indicate that the local mode is sensitive to both Si and Ge atomic mass changes; reducing the Si atomic mass shifts the local mode to higher frequencies, and increasing the Ge atomic mass shifts the local mode to lower frequencies. Furthermore, the results suggest that the local mode originates from the Si–Ge bond vibration. Although the Si–Si, Si–Ge, and Ge–Ge optical mode frequencies are well approximated by the two-body harmonic oscillator model, a much heavier effective mass than that of the Si–Ge pair must be assumed to reproduce the local mode frequency. A plausible interpretation of the local mode is a collective vibration of Ge clusters embedded within the Si lattice.
format	article
author	Sylvia Yuk Yee Chung Motohiro Tomita Ryo Yokogawa Atsushi Ogura Takanobu Watanabe
author_facet	Sylvia Yuk Yee Chung Motohiro Tomita Ryo Yokogawa Atsushi Ogura Takanobu Watanabe
author_sort	Sylvia Yuk Yee Chung
title	Atomic mass dependency of a localized phonon mode in SiGe alloys
title_short	Atomic mass dependency of a localized phonon mode in SiGe alloys
title_full	Atomic mass dependency of a localized phonon mode in SiGe alloys
title_fullStr	Atomic mass dependency of a localized phonon mode in SiGe alloys
title_full_unstemmed	Atomic mass dependency of a localized phonon mode in SiGe alloys
title_sort	atomic mass dependency of a localized phonon mode in sige alloys
publisher	AIP Publishing LLC
publishDate	2021
url	https://doaj.org/article/a8366e761b2d4418838e2340d6880597
work_keys_str_mv	AT sylviayukyeechung atomicmassdependencyofalocalizedphononmodeinsigealloys AT motohirotomita atomicmassdependencyofalocalizedphononmodeinsigealloys AT ryoyokogawa atomicmassdependencyofalocalizedphononmodeinsigealloys AT atsushiogura atomicmassdependencyofalocalizedphononmodeinsigealloys AT takanobuwatanabe atomicmassdependencyofalocalizedphononmodeinsigealloys
_version_	1718404711864860672

Atomic mass dependency of a localized phonon mode in SiGe alloys

Ejemplares similares