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Picosecond x-ray strain rosette reveals direct laser excitation of coherent transverse acoustic phonons

Using a strain-rosette, we demonstrate the existence of transverse strain using time-resolved x-ray diffraction from multiple Bragg reflections in laser-excited bulk gallium arsenide. We find that anisotropic strain is responsible for a considerable fraction of the total lattice motion at early time...

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Autores principales: Lee, Sooheyong, Williams, G. Jackson, Campana, Maria I., Walko, Donald A., Landahl, Eric C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4707471/
https://www.ncbi.nlm.nih.gov/pubmed/26751616
http://dx.doi.org/10.1038/srep19140
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author Lee, Sooheyong
Williams, G. Jackson
Campana, Maria I.
Walko, Donald A.
Landahl, Eric C.
author_facet Lee, Sooheyong
Williams, G. Jackson
Campana, Maria I.
Walko, Donald A.
Landahl, Eric C.
author_sort Lee, Sooheyong
collection PubMed
description Using a strain-rosette, we demonstrate the existence of transverse strain using time-resolved x-ray diffraction from multiple Bragg reflections in laser-excited bulk gallium arsenide. We find that anisotropic strain is responsible for a considerable fraction of the total lattice motion at early times before thermal equilibrium is achieved. Our measurements are described by a new model where the Poisson ratio drives transverse motion, resulting in the creation of shear waves without the need for an indirect process such as mode conversion at an interface. Using the same excitation geometry with the narrow-gap semiconductor indium antimonide, we detected coherent transverse acoustic oscillations at frequencies of several GHz.
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spelling pubmed-47074712016-01-20 Picosecond x-ray strain rosette reveals direct laser excitation of coherent transverse acoustic phonons Lee, Sooheyong Williams, G. Jackson Campana, Maria I. Walko, Donald A. Landahl, Eric C. Sci Rep Article Using a strain-rosette, we demonstrate the existence of transverse strain using time-resolved x-ray diffraction from multiple Bragg reflections in laser-excited bulk gallium arsenide. We find that anisotropic strain is responsible for a considerable fraction of the total lattice motion at early times before thermal equilibrium is achieved. Our measurements are described by a new model where the Poisson ratio drives transverse motion, resulting in the creation of shear waves without the need for an indirect process such as mode conversion at an interface. Using the same excitation geometry with the narrow-gap semiconductor indium antimonide, we detected coherent transverse acoustic oscillations at frequencies of several GHz. Nature Publishing Group 2016-01-11 /pmc/articles/PMC4707471/ /pubmed/26751616 http://dx.doi.org/10.1038/srep19140 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Lee, Sooheyong
Williams, G. Jackson
Campana, Maria I.
Walko, Donald A.
Landahl, Eric C.
Picosecond x-ray strain rosette reveals direct laser excitation of coherent transverse acoustic phonons
title Picosecond x-ray strain rosette reveals direct laser excitation of coherent transverse acoustic phonons
title_full Picosecond x-ray strain rosette reveals direct laser excitation of coherent transverse acoustic phonons
title_fullStr Picosecond x-ray strain rosette reveals direct laser excitation of coherent transverse acoustic phonons
title_full_unstemmed Picosecond x-ray strain rosette reveals direct laser excitation of coherent transverse acoustic phonons
title_short Picosecond x-ray strain rosette reveals direct laser excitation of coherent transverse acoustic phonons
title_sort picosecond x-ray strain rosette reveals direct laser excitation of coherent transverse acoustic phonons
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4707471/
https://www.ncbi.nlm.nih.gov/pubmed/26751616
http://dx.doi.org/10.1038/srep19140
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