11-02/03 :: February / March 2011

nanotimes News in Brief

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Two still frames recorded from the newly developed imaging method. The time interval between the two frames is only 0.00000000000007 seconds. Recording: Rohwer et al., © CAU, Germany

The Kiel University has proven international expertise as a North German research university in the field of nanosciences and surface science, for example, in the German Research Foundation’s Collaborative Research Centre 855 “Magnetoelectric Composites – Future Biomagnetic Interfaces”. Furthermore, the CAU is applying for the current round of the Excel- lence Initiative with the excellence cluster “Materials for Life”.

When, for example, molecules react with one another or when the switching states in electronic components change, processes at the atomic length scale are involved which take place on time scales of femtoseconds. Ultra short laser pulses in the so- called „soft x-ray spectral region“ – i.e. light with very short wavelengths – enables one to make snapshots

of the electronic states which are transiently formed during a switching process, for example. The shots are combined in series to deliver a film depicting such switching processes with a level of detail and a temporal resolution which could previously not be achieved.

Timm Rohwer, Stefan Hellmann, Martin Wiesenmayer, Christian Sohrt, Ankatrin Stange, Bartosz Slomski, Adra Carr, Yanwei Liu, Luis Miaja Avila, Matthias Kalläne, Stefan Mathias, Lutz Kipp, Kai Rossnagel & Michael Bauer: Col- lapse of long-range charge order tracked by time-resolved photoemission at high momenta, In: Nature AOP, March 09, 2011, DOI:10.1038/nature09829: http://dx.doi.org/10.1038/nature09829