Journal
SCIENCE
Volume 345, Issue 6193, Pages 200-204Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1250658
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Funding
- Deutsche Forschungsgemeinschaft [DFG-ZuK 45/1, DFG-SFB 1073]
- German National Academic Foundation
- Alexander von Humboldt Foundation
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Two-dimensional systems such as surfaces and molecular monolayers exhibit a multitude of intriguing phases and complex transitions. Ultrafast structural probing of such systems offers direct time-domain information on internal interactions and couplings to a substrate or bulk support. We have developed ultrafast low-energy electron diffraction and investigate in transmission the structural relaxation in a polymer/graphene bilayer system excited out of equilibrium. The laser-pump/electron-probe scheme resolves the ultrafast melting of a polymer superstructure consisting of folded-chain crystals registered to a free-standing graphene substrate. We extract the time scales of energy transfer across the bilayer interface, the loss of superstructure order, and the appearance of an amorphous phase with short-range correlations. The high surface sensitivity makes this experimental approach suitable for numerous problems in ultrafast surface science.
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