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Atomistic Engineering of Phonons in Functional Oxide Heterostructures

Engineering of phonons, that is, collective lattice vibrations in crystals, is essential for manipulating physical properties of materials such as thermal transport, electron‐phonon interaction, confinement of lattice vibration, and optical polarization. Most approaches to phonon‐engineering have be...

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Autores principales: Jeong, Seung Gyo, Seo, Ambrose, Choi, Woo Seok
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8895146/
https://www.ncbi.nlm.nih.gov/pubmed/35038232
http://dx.doi.org/10.1002/advs.202103403
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author Jeong, Seung Gyo
Seo, Ambrose
Choi, Woo Seok
author_facet Jeong, Seung Gyo
Seo, Ambrose
Choi, Woo Seok
author_sort Jeong, Seung Gyo
collection PubMed
description Engineering of phonons, that is, collective lattice vibrations in crystals, is essential for manipulating physical properties of materials such as thermal transport, electron‐phonon interaction, confinement of lattice vibration, and optical polarization. Most approaches to phonon‐engineering have been largely limited to the high‐quality heterostructures of III–V compound semiconductors. Yet, artificial engineering of phonons in a variety of materials with functional properties, such as complex oxides, will yield unprecedented applications of coherent tunable phonons in future quantum acoustic devices. In this study, artificial engineering of phonons in the atomic‐scale SrRuO(3)/SrTiO(3) superlattices is demonstrated, wherein tunable phonon modes are observed via confocal Raman spectroscopy. In particular, the coherent superlattices led to the backfolding of acoustic phonon dispersion, resulting in zone‐folded acoustic phonons in the THz frequency domain. The frequencies can be largely tuned from 1 to 2 THz via atomic‐scale precision thickness control. In addition, a polar optical phonon originating from the local inversion symmetry breaking in the artificial oxide superlattices is observed, exhibiting emergent functionality. The approach of atomic‐scale heterostructuring of complex oxides will vastly expand material systems for quantum acoustic devices, especially with the viability of functionality integration.
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spelling pubmed-88951462022-03-10 Atomistic Engineering of Phonons in Functional Oxide Heterostructures Jeong, Seung Gyo Seo, Ambrose Choi, Woo Seok Adv Sci (Weinh) Research Articles Engineering of phonons, that is, collective lattice vibrations in crystals, is essential for manipulating physical properties of materials such as thermal transport, electron‐phonon interaction, confinement of lattice vibration, and optical polarization. Most approaches to phonon‐engineering have been largely limited to the high‐quality heterostructures of III–V compound semiconductors. Yet, artificial engineering of phonons in a variety of materials with functional properties, such as complex oxides, will yield unprecedented applications of coherent tunable phonons in future quantum acoustic devices. In this study, artificial engineering of phonons in the atomic‐scale SrRuO(3)/SrTiO(3) superlattices is demonstrated, wherein tunable phonon modes are observed via confocal Raman spectroscopy. In particular, the coherent superlattices led to the backfolding of acoustic phonon dispersion, resulting in zone‐folded acoustic phonons in the THz frequency domain. The frequencies can be largely tuned from 1 to 2 THz via atomic‐scale precision thickness control. In addition, a polar optical phonon originating from the local inversion symmetry breaking in the artificial oxide superlattices is observed, exhibiting emergent functionality. The approach of atomic‐scale heterostructuring of complex oxides will vastly expand material systems for quantum acoustic devices, especially with the viability of functionality integration. John Wiley and Sons Inc. 2022-01-17 /pmc/articles/PMC8895146/ /pubmed/35038232 http://dx.doi.org/10.1002/advs.202103403 Text en © 2022 The Authors. Advanced Science published by Wiley‐VCH GmbH https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Jeong, Seung Gyo
Seo, Ambrose
Choi, Woo Seok
Atomistic Engineering of Phonons in Functional Oxide Heterostructures
title Atomistic Engineering of Phonons in Functional Oxide Heterostructures
title_full Atomistic Engineering of Phonons in Functional Oxide Heterostructures
title_fullStr Atomistic Engineering of Phonons in Functional Oxide Heterostructures
title_full_unstemmed Atomistic Engineering of Phonons in Functional Oxide Heterostructures
title_short Atomistic Engineering of Phonons in Functional Oxide Heterostructures
title_sort atomistic engineering of phonons in functional oxide heterostructures
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8895146/
https://www.ncbi.nlm.nih.gov/pubmed/35038232
http://dx.doi.org/10.1002/advs.202103403
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