Dr
Michael Porer
(PSI - Paul Scherrer Institut)
Ultrafast optical control of correlation-induced order parameters in complex materials is a key challenge en route to new functional materials. Here we employ above-bandgap femtosecond pulses with various wavelenghts to excite EuTiO$_3$ out of its low-temperature antiferrodistortive equilibrium phase. Monitoring the subsequent transient intensity of distortion-induced superlattice reflections via 80-fs hard x-ray pulses at LCLS, we observe a transient increase of their intensities in a sub-ps time window. This represents an optically induced ultrafast increase of the structural order parameter, which stands in strong contrast to the reduction of the distortion with thermal heating in equilibrium. Preliminary DFT calculations identify 4f-hole-doping as possible driving force.
Dr
Michael Porer
(PSI - Paul Scherrer Institut)
Dr
Sergii Parchenko
(Paul Scherrer Institut)
Mr
Martin Neugebauer
(ETHZ - ETH Zurich)
Dr
Martin Kubli
(Institute for Quantum Electronics, ETH Zürich)
Dr
Milan Radovic
(Paul Scherrer Institute)
Dr
Elisabeth Bothschafter
(Paul Scherrer Institut)
Dr
Laurenz Rettig
(Paul Scherrer Institut)
Dr
Sanghoon Song
(Linac Coherent Light Source, SLAC National Accelerator Laboratory)
Dr
Takahiro Sato
(Linac Coherent Light Source, SLAC National Accelerator Laboratory)
Dr
Awadesh Narayan
(Materials Theory, ETH Zürich)
Prof.
Nicola Spaldin
(Materials Theory, ETH Zürich)
Dr
Michael Fechner
(Max Planck Institute for the Structure and Dynamics of Matter, CFEL, Hamburg)
Prof.
Steve Johnson
(Institute for Quantum Electronics, ETH Zürich)
Dr
Urs Staub
(Paul-Scherrer Institute, Switzerland)
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