Photoinduced anisotropic lattice dynamic response and domain formation in thermoelectric SnSe

Abstract Identifying and understanding the mechanisms behind strong phonon–phonon scattering in condensed matter systems is critical to maximizing the efficiency of thermoelectric devices. To date, the leading method to address this has been to meticulously survey the full phonon dispersion of the m...

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Autores principales:	Wei Wang, Lijun Wu, Junjie Li, Niraj Aryal, Xilian Jin, Yu Liu, Mikhail Fedurin, Marcus Babzien, Rotem Kupfer, Mark Palmer, Cedomir Petrovic, Weiguo Yin, Mark P. M. Dean, Ian K. Robinson, Jing Tao, Yimei Zhu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/2bcfcd7235d94d59b260ac6f2eb39833
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spelling	oai:doaj.org-article:2bcfcd7235d94d59b260ac6f2eb398332021-12-05T12:25:27ZPhotoinduced anisotropic lattice dynamic response and domain formation in thermoelectric SnSe10.1038/s41535-021-00400-y2397-4648https://doaj.org/article/2bcfcd7235d94d59b260ac6f2eb398332021-11-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00400-yhttps://doaj.org/toc/2397-4648Abstract Identifying and understanding the mechanisms behind strong phonon–phonon scattering in condensed matter systems is critical to maximizing the efficiency of thermoelectric devices. To date, the leading method to address this has been to meticulously survey the full phonon dispersion of the material in order to isolate modes with anomalously large linewidth and temperature-dependence. Here we combine quantitative MeV ultrafast electron diffraction (UED) analysis with Monte Carlo based dynamic diffraction simulation and first-principles calculations to directly unveil the soft, anharmonic lattice distortions of model thermoelectric material SnSe. A small single-crystal sample is photoexcited with ultrafast optical pulses and the soft, anharmonic lattice distortions are isolated using MeV-UED as those associated with long relaxation time and large displacements. We reveal that these modes have interlayer shear strain character, induced mainly by c-axis atomic displacements, resulting in domain formation in the transient state. These findings provide an innovative approach to identify mechanisms for ultralow and anisotropic thermal conductivity and a promising route to optimizing thermoelectric devices.Wei WangLijun WuJunjie LiNiraj AryalXilian JinYu LiuMikhail FedurinMarcus BabzienRotem KupferMark PalmerCedomir PetrovicWeiguo YinMark P. M. DeanIan K. RobinsonJing TaoYimei ZhuNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Wei Wang Lijun Wu Junjie Li Niraj Aryal Xilian Jin Yu Liu Mikhail Fedurin Marcus Babzien Rotem Kupfer Mark Palmer Cedomir Petrovic Weiguo Yin Mark P. M. Dean Ian K. Robinson Jing Tao Yimei Zhu Photoinduced anisotropic lattice dynamic response and domain formation in thermoelectric SnSe
description	Abstract Identifying and understanding the mechanisms behind strong phonon–phonon scattering in condensed matter systems is critical to maximizing the efficiency of thermoelectric devices. To date, the leading method to address this has been to meticulously survey the full phonon dispersion of the material in order to isolate modes with anomalously large linewidth and temperature-dependence. Here we combine quantitative MeV ultrafast electron diffraction (UED) analysis with Monte Carlo based dynamic diffraction simulation and first-principles calculations to directly unveil the soft, anharmonic lattice distortions of model thermoelectric material SnSe. A small single-crystal sample is photoexcited with ultrafast optical pulses and the soft, anharmonic lattice distortions are isolated using MeV-UED as those associated with long relaxation time and large displacements. We reveal that these modes have interlayer shear strain character, induced mainly by c-axis atomic displacements, resulting in domain formation in the transient state. These findings provide an innovative approach to identify mechanisms for ultralow and anisotropic thermal conductivity and a promising route to optimizing thermoelectric devices.
format	article
author	Wei Wang Lijun Wu Junjie Li Niraj Aryal Xilian Jin Yu Liu Mikhail Fedurin Marcus Babzien Rotem Kupfer Mark Palmer Cedomir Petrovic Weiguo Yin Mark P. M. Dean Ian K. Robinson Jing Tao Yimei Zhu
author_facet	Wei Wang Lijun Wu Junjie Li Niraj Aryal Xilian Jin Yu Liu Mikhail Fedurin Marcus Babzien Rotem Kupfer Mark Palmer Cedomir Petrovic Weiguo Yin Mark P. M. Dean Ian K. Robinson Jing Tao Yimei Zhu
author_sort	Wei Wang
title	Photoinduced anisotropic lattice dynamic response and domain formation in thermoelectric SnSe
title_short	Photoinduced anisotropic lattice dynamic response and domain formation in thermoelectric SnSe
title_full	Photoinduced anisotropic lattice dynamic response and domain formation in thermoelectric SnSe
title_fullStr	Photoinduced anisotropic lattice dynamic response and domain formation in thermoelectric SnSe
title_full_unstemmed	Photoinduced anisotropic lattice dynamic response and domain formation in thermoelectric SnSe
title_sort	photoinduced anisotropic lattice dynamic response and domain formation in thermoelectric snse
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/2bcfcd7235d94d59b260ac6f2eb39833
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Photoinduced anisotropic lattice dynamic response and domain formation in thermoelectric SnSe

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