Ultra-fast Time-Resolved Electron Diffraction of Strongly Driven Phase Transitions on Silicon Surfaces
作者： Simone Möllenbeck , Anja Hanisch-Blicharski , Paul Schneider , Manuel Ligges , Ping Zhou
DOI: 10.1557/PROC-1230-MM03-09
关键词: Electron diffraction 、 Phase transition 、 Condensed matter physics 、 Excited state 、 Molecular physics 、 Picosecond 、 Materials science 、 Gas electron diffraction 、 Excitation 、 Monolayer 、 Reflection high-energy electron diffraction
摘要: The dynamics of strongly driven phase transitions at surfaces are studied by ultra-fast time-resolved reflection high energy electron diffraction. excited an intense fs-laser pulse (pump) and probed ultra-short with variable time delay. order-disorder transition from a c(4×2) to (2×1) the bare Si(001) surface shows transient decrease intensity spots which recovers on scale few hundred picoseconds indicating excitation transition. On Si(111) monolayer Indium induces (4×1) reconstruction undergoes Peierls like (8ד2”) below 100 K. Upon laser temperature 40 K was driven. (8ד2”)-diffraction instantaneously disappears, while (4×1)-spots increases. This increase spot excludes explanation Debye-Waller-Effect is evidence for true structural surface.
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