Coherent atomic motions in a nanostructure studied by femtosecond x-ray diffraction

被引:227
|
作者
Bargheer, M
Zhavoronkov, N
Gritsai, Y
Woo, JC
Kim, DS
Woerner, M [1 ]
Elsaesser, T
机构
[1] Max Born Inst Nuchtlineare Opt & Kurzzeitspektros, D-12489 Berlin, Germany
[2] Seoul Natl Univ, Sch Phys, Seoul 151742, South Korea
关键词
D O I
10.1126/science.1104739
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Reversible structural changes of a nanostructure were measured non-destructively with subpicometer spatial and subpicosecond temporal resolution via x-ray diffraction (XRD). The spatially periodic femtosecond excitation of a gallium arsenide/aluminum gallium arsenide superlattice results in coherent lattice motions with a 3.5-picosecond period, which was directly monitored by femtosecond x-ray pulses at a 1-kilohertz repetition rate. Small changes (DeltaR/R=0.01) of weak Bragg reflexes (R=0.005) were detected. The phase and amplitude of the oscillatory XRD signal around a new equilibrium demonstrate that displacive excitation of the zone-folded acoustic phonons is the dominant mechanism for strong excitation.
引用
收藏
页码:1771 / 1773
页数:3
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