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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

机译：减速的晶格激发和表面不存在体声子模：fs-激光激发时Bi（111）表面的超快速电子衍射

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摘要

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.

机译：飞秒激光脉冲照射后，采用超快反射高能电子衍射跟踪Bi（111）表面的晶格激发。原子的热运动通过Debye-Waller效应进行分析。当Bi本体以2到4 ps的时间尺度加热时，我们观察到表面原子的振动运动的激发发生得慢得多，时间常数为12 ps。这种瞬态不平衡的情况归因于体声子模式与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。由于瞬态衍射强度中没有快速成分，因此可以得出结论，在表面上不存在截短的体声子模。

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期刊名称 Structural Dynamics
作者
V. Tinnemann; C. Streubühr; B. Hafke; T. Witte; A. Kalus; A. Hanisch-Blicharski; M. Ligges; P. Zhou; D. von der Linde; U. Bovensiepen; M. Horn-von Hoegen;
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年(卷),期 2019(6),6
年度 2019
页码 -1
总页数 5
原文格式 PDF
正文语种
中图分类生物物理学;
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1. Decelerated lattice excitation and absence of bulk phonon modes at surfaces: Ultra-fast electron diffraction from Bi(111) surface upon fs-laser excitation [J] . V. Tinnemann, C. Streubühr, B. Hafke, Structural Dynamics . 2019,第6期

机译：在表面上减速的晶格激发和散装声子模式的缺失：FS激光激发的Bi（111）表面上的超快速电子衍射
2. Ultrafast electron diffraction from a Bi(111) surface: Impulsive lattice excitation and Debye–Waller analysis at large momentum transfer [J] . V. Tinnemann, C. Streubühr, B. Hafke, Structural Dynamics . 2019,第3期

机译：来自Bi（111）表面的超快速电子衍射：大动量传递下的脉冲晶格激发和Debye-Waller分析
3. Electron excitation in the interaction of slow ions and electrons with metals and monolayer graphite on Ni(111) surfaces [J] . Cupolillo A, Pisarra M, Sindona A, Vacuum: Technology Applications & Ion Physics: The International Journal & Abstracting Service for Vacuum Science & Technology . 2010,第8期

机译：Ni（111）表面上慢速离子和电子与金属和单层石墨相互作用中的电子激发
4. Transient Cooling of Ultrathin Epitaxial Bi(111)-Films on Si(111) Upon Femtosecond Laser Excitation Studied by Ultrafast Reflection High Energy Electron Diffraction [C] . Anja Hanisch-Blicharski, Boris Krenzer, Simone Mollenbeck Materials Research Society Symposium . 2009

机译：超薄外延Bi（111）-Films在Si（111）上的瞬态冷却（111），通过超秒反射高能电子衍射研究的飞秒激光激发
5. Molecular beams scattering from metal surfaces: Observation of vibrational excitation in hydrogen chloride collisions with gold(111). [D] . Matsiev, Daniel. 2007

机译：从金属表面散射的分子束：观察氯化氢与金（111）碰撞时的振动激发。
6. Ultrafast electron diffraction from a Bi(111) surface: Impulsive lattice excitation and Debye–Waller analysis at large momentum transfer [O] . V. Tinnemann, C. Streubühr, B. Hafke, 2019

机译：来自Bi（111）表面的超快速电子衍射：大动量传递下的脉冲晶格激发和Debye-Waller分析
7. Ultra-Fast Time-Resolved Electron Diffraction at Adsorbate Systems on Silicon Surfaces: Vibrational Excitation in Monolayers and Dynamics of Phase Transitions [O] . Möllenbeck Simone 2011

机译：硅表面吸附系统的超快速时间分辨电子衍射：单分子层中的振动激发和相变动力学
8. Distinguishing Bulk and Surface Electron-Phonon Coupling in the Topological Insulator Bi2Se3 Using Time-Resolved Photoemission Spectroscopy. [R] . Sobota, J. A., Yang, S. L., Leuenberger, D., 2014

机译：利用时间分辨光电子能谱区分拓扑绝缘体Bi2se3中的体积和表面电子 - 声子耦合。

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

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