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表面晶格激发减速及体声子模式缺失：飞秒激光激发下Bi(111)表面的超快电子衍射

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

作者信息

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

机构信息

Department of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany.

出版信息

Struct Dyn. 2019 Nov 5;6(6):065101. doi: 10.1063/1.5128275. eCollection 2019 Nov.

DOI:10.1063/1.5128275
PMID:31700944
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6831505/
Abstract

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.

摘要

采用超快反射高能电子衍射来跟踪飞秒激光脉冲照射下Bi(111)表面的晶格激发。通过德拜-瓦勒效应分析原子的热运动。虽然Bi块体在2到4皮秒的时间尺度上被加热，但我们观察到表面原子振动运动的激发要慢得多，时间常数为12皮秒。这种瞬态非平衡情况归因于体声子模式和表面声子模式之间的弱耦合，这阻碍了两个子系统之间的能量流动。此外，从瞬态衍射强度中没有快速成分可以得出结论，表面不存在截断的体声子模式。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24ee/6831505/c90c675f4621/SDTYAE-000006-065101_1-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24ee/6831505/29a0635930eb/SDTYAE-000006-065101_1-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24ee/6831505/966a895704c9/SDTYAE-000006-065101_1-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24ee/6831505/0f2039e578cd/SDTYAE-000006-065101_1-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24ee/6831505/c90c675f4621/SDTYAE-000006-065101_1-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24ee/6831505/29a0635930eb/SDTYAE-000006-065101_1-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24ee/6831505/966a895704c9/SDTYAE-000006-065101_1-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24ee/6831505/0f2039e578cd/SDTYAE-000006-065101_1-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24ee/6831505/c90c675f4621/SDTYAE-000006-065101_1-g004.jpg

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Phys Rev Lett. 2014 Dec 5;113(23):235502. doi: 10.1103/PhysRevLett.113.235502. Epub 2014 Dec 1.
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