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Soft X-ray spectroscopy of clusters, surfaces and interfaces |
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Correlated Materials
The delicate interplay between spin, charge and lattice degrees of freedom in correlated materials yields rich phase diagrams as function for example of chemical composition and external fields. The proximity of various phases, especially near a quantum critical point, can originate electronically distinct domains into the material which experience temporal and spatial fluctuations over many time and length scales. We employ time resolved core level spectroscopies to study the evolution of such systems.
We have studied the TaS2 charge-density-wave metal insulator transition induced by optical excitation [1] and we are currently studying the ultrafast demagnetization of iron films induced by ultrashort optical laser pulses (800nm) (in collaboration with Yves Acremann, ETH Zurich). The aim is to obtain a microscopical picture for such ultrafast changes.
[1] Hellmann S. et al, Phys. Rev. Lett. 105, 187401 (2010)
