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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...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Crystallographic Association
2019
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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. |
format | Online Article Text |
id | pubmed-6831505 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | American Crystallographic Association |
record_format | MEDLINE/PubMed |
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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