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Decelerated lattice excitation and absence of bulk phonon modes at surfaces: Ultra-fast electron diffraction from Bi(111) surface upon fs-laser excitation

Ultrafast reflection high-energy electron diffraction is employed to follow the lattice excitation of a Bi(111) surface upon irradiation with a femtosecond laser pulse. The thermal motion of the atoms is analyzed through the Debye–Waller effect. While the Bi bulk is heated on time scales of 2 to 4 p...

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Autores principales: Tinnemann, V., Streubühr, C., Hafke, B., Witte, T., Kalus, A., Hanisch-Blicharski, A., Ligges, M., Zhou, P., von der Linde, D., Bovensiepen, U., Horn-von Hoegen, M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Crystallographic Association 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6831505/
https://www.ncbi.nlm.nih.gov/pubmed/31700944
http://dx.doi.org/10.1063/1.5128275
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author Tinnemann, V.
Streubühr, C.
Hafke, B.
Witte, T.
Kalus, A.
Hanisch-Blicharski, A.
Ligges, M.
Zhou, P.
von der Linde, D.
Bovensiepen, U.
Horn-von Hoegen, M.
author_facet Tinnemann, V.
Streubühr, C.
Hafke, B.
Witte, T.
Kalus, A.
Hanisch-Blicharski, A.
Ligges, M.
Zhou, P.
von der Linde, D.
Bovensiepen, U.
Horn-von Hoegen, M.
author_sort Tinnemann, V.
collection PubMed
description Ultrafast reflection high-energy electron diffraction is employed to follow the lattice excitation of a Bi(111) surface upon irradiation with a femtosecond laser pulse. The thermal motion of the atoms is analyzed through the Debye–Waller effect. While the Bi bulk is heated on time scales of 2 to 4 ps, we observe that the excitation of vibrational motion of the surface atoms occurs much slower with a time constant of 12 ps. This transient nonequilibrium situation is attributed to the weak coupling between bulk and surface phonon modes which hampers the energy flow between the two subsystems. From the absence of a fast component in the transient diffraction intensity, it is in addition concluded that truncated bulk phonon modes are absent at the surface.
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spelling pubmed-68315052019-11-07 Decelerated lattice excitation and absence of bulk phonon modes at surfaces: Ultra-fast electron diffraction from Bi(111) surface upon fs-laser excitation Tinnemann, V. Streubühr, C. Hafke, B. Witte, T. Kalus, A. Hanisch-Blicharski, A. Ligges, M. Zhou, P. von der Linde, D. Bovensiepen, U. Horn-von Hoegen, M. Struct Dyn ARTICLES Ultrafast reflection high-energy electron diffraction is employed to follow the lattice excitation of a Bi(111) surface upon irradiation with a femtosecond laser pulse. The thermal motion of the atoms is analyzed through the Debye–Waller effect. While the Bi bulk is heated on time scales of 2 to 4 ps, we observe that the excitation of vibrational motion of the surface atoms occurs much slower with a time constant of 12 ps. This transient nonequilibrium situation is attributed to the weak coupling between bulk and surface phonon modes which hampers the energy flow between the two subsystems. From the absence of a fast component in the transient diffraction intensity, it is in addition concluded that truncated bulk phonon modes are absent at the surface. American Crystallographic Association 2019-11-05 /pmc/articles/PMC6831505/ /pubmed/31700944 http://dx.doi.org/10.1063/1.5128275 Text en © 2019 Author(s). 2329-7778/2019/6(6)/065101/5 All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle ARTICLES
Tinnemann, V.
Streubühr, C.
Hafke, B.
Witte, T.
Kalus, A.
Hanisch-Blicharski, A.
Ligges, M.
Zhou, P.
von der Linde, D.
Bovensiepen, U.
Horn-von Hoegen, M.
Decelerated lattice excitation and absence of bulk phonon modes at surfaces: Ultra-fast electron diffraction from Bi(111) surface upon fs-laser excitation
title Decelerated lattice excitation and absence of bulk phonon modes at surfaces: Ultra-fast electron diffraction from Bi(111) surface upon fs-laser excitation
title_full Decelerated lattice excitation and absence of bulk phonon modes at surfaces: Ultra-fast electron diffraction from Bi(111) surface upon fs-laser excitation
title_fullStr Decelerated lattice excitation and absence of bulk phonon modes at surfaces: Ultra-fast electron diffraction from Bi(111) surface upon fs-laser excitation
title_full_unstemmed Decelerated lattice excitation and absence of bulk phonon modes at surfaces: Ultra-fast electron diffraction from Bi(111) surface upon fs-laser excitation
title_short Decelerated lattice excitation and absence of bulk phonon modes at surfaces: Ultra-fast electron diffraction from Bi(111) surface upon fs-laser excitation
title_sort decelerated lattice excitation and absence of bulk phonon modes at surfaces: ultra-fast electron diffraction from bi(111) surface upon fs-laser excitation
topic ARTICLES
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6831505/
https://www.ncbi.nlm.nih.gov/pubmed/31700944
http://dx.doi.org/10.1063/1.5128275
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