Ultralow Lattice Thermal Conductivity of the Random Multilayer Structure with Lattice Imperfections

Abstract Randomizing the layer thickness of superlattices (SL) can lead to localization of coherent phonons and thereby reduces the lattice thermal conductivity κ l . In this work, we propose strategies that can suppress incoherent phonon transport in the above random multilayer (RML) structure to f...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Pranay Chakraborty, Lei Cao, Yan Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5af6146a0b29471fb65532c7e3282c94
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:5af6146a0b29471fb65532c7e3282c94
record_format	dspace
spelling	oai:doaj.org-article:5af6146a0b29471fb65532c7e3282c942021-12-02T12:32:56ZUltralow Lattice Thermal Conductivity of the Random Multilayer Structure with Lattice Imperfections10.1038/s41598-017-08359-22045-2322https://doaj.org/article/5af6146a0b29471fb65532c7e3282c942017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08359-2https://doaj.org/toc/2045-2322Abstract Randomizing the layer thickness of superlattices (SL) can lead to localization of coherent phonons and thereby reduces the lattice thermal conductivity κ l . In this work, we propose strategies that can suppress incoherent phonon transport in the above random multilayer (RML) structure to further reduce κ l . Molecular dynamics simulations are conducted to investigate phonon heat conduction in SLs and RMLs with lattice imperfections. We found that interfacial species mixing enhances thermal transport across single interfaces and few-period SLs through the phonon “bridge” mechanism, while it substantially reduces the κ l of many-period SLs by breaking the phonon coherence. This is a clear manifestation of the transition from incoherent-phonon-dominated to coherent-phonon-dominated heat conduction in SLs when the number of interface increases. In contrast, interfacial species mixing always increases the κ l of RMLs owing to the dominance of incoherent phonons. Moreover, we found that doping a binary RML with impurities can reduce κ l significantly, especially when the impurity atom has an atomic mass lower or higher than both of the two base elements. This work reveals the critical effect of lattice imperfections on thermal transport in SLs and RMLs, and provides a unique strategy to hierachically suppress coherent and incoherent phonon transport concurrently.Pranay ChakrabortyLei CaoYan WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Pranay Chakraborty Lei Cao Yan Wang Ultralow Lattice Thermal Conductivity of the Random Multilayer Structure with Lattice Imperfections
description	Abstract Randomizing the layer thickness of superlattices (SL) can lead to localization of coherent phonons and thereby reduces the lattice thermal conductivity κ l . In this work, we propose strategies that can suppress incoherent phonon transport in the above random multilayer (RML) structure to further reduce κ l . Molecular dynamics simulations are conducted to investigate phonon heat conduction in SLs and RMLs with lattice imperfections. We found that interfacial species mixing enhances thermal transport across single interfaces and few-period SLs through the phonon “bridge” mechanism, while it substantially reduces the κ l of many-period SLs by breaking the phonon coherence. This is a clear manifestation of the transition from incoherent-phonon-dominated to coherent-phonon-dominated heat conduction in SLs when the number of interface increases. In contrast, interfacial species mixing always increases the κ l of RMLs owing to the dominance of incoherent phonons. Moreover, we found that doping a binary RML with impurities can reduce κ l significantly, especially when the impurity atom has an atomic mass lower or higher than both of the two base elements. This work reveals the critical effect of lattice imperfections on thermal transport in SLs and RMLs, and provides a unique strategy to hierachically suppress coherent and incoherent phonon transport concurrently.
format	article
author	Pranay Chakraborty Lei Cao Yan Wang
author_facet	Pranay Chakraborty Lei Cao Yan Wang
author_sort	Pranay Chakraborty
title	Ultralow Lattice Thermal Conductivity of the Random Multilayer Structure with Lattice Imperfections
title_short	Ultralow Lattice Thermal Conductivity of the Random Multilayer Structure with Lattice Imperfections
title_full	Ultralow Lattice Thermal Conductivity of the Random Multilayer Structure with Lattice Imperfections
title_fullStr	Ultralow Lattice Thermal Conductivity of the Random Multilayer Structure with Lattice Imperfections
title_full_unstemmed	Ultralow Lattice Thermal Conductivity of the Random Multilayer Structure with Lattice Imperfections
title_sort	ultralow lattice thermal conductivity of the random multilayer structure with lattice imperfections
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/5af6146a0b29471fb65532c7e3282c94
work_keys_str_mv	AT pranaychakraborty ultralowlatticethermalconductivityoftherandommultilayerstructurewithlatticeimperfections AT leicao ultralowlatticethermalconductivityoftherandommultilayerstructurewithlatticeimperfections AT yanwang ultralowlatticethermalconductivityoftherandommultilayerstructurewithlatticeimperfections
_version_	1718393920921010176

Ultralow Lattice Thermal Conductivity of the Random Multilayer Structure with Lattice Imperfections

Ejemplares similares