• Ultrafast Dynamics in Condensed Matter

Welcome to the UDKM group website

We investigate coherent and incoherent non-equilibrium phenomena at the nanoscale initiated by various external stimuli, e.g. light and electromagnetic pulses. While incoherent processes transport heat and charges and may drive phase transitions and chemical reactions, coherent dynamics range from strain- and spin waves to strong coupling in exciton-plasmon systems.

Our focus is on a time-domain description of transporting and transforming energy among various excitations of matter. Transient strain and lattice dynamics in general are central observables in solids that are often connected and thus sensitive to other excitations such as hot electrons, lattice vibrations (phonons) and spin waves, electron-and phonon excitations, as well as  the latent heat of phase transitions. We aim at controlling strain waves in order to advance the field of nonlinear phononics and identify means of strain-assisted manipulation of magnetic and ferroelectric order. Polaritons, in particular plasmons, couple macroscopic light fields into the nanoworld, acting as an antenna for the chemical, electronic, magnetic or phononic excitations.

Typical research questions of the group involve ultrafast excitations, electron-phonon interaction, strain and heat as a driver of or sensor for ultrafast magnetism, ferroelectric switching and chemical reactions.

We attempt to create a special perspective on these phenomena by combining our experimental workhorses, which are ultrafast versions of x-ray diffraction, magneto-optics, transient absorption and reflection as well as time-resolved Raman scattering. We synthesize plasmonic nanostructures such as nanorods or nanostars embedded in soft condensed matter, e.g. nanolayered polyelectrolytes, whereas solid nanostructures are provided by our collaboration partners.

Recent publications

Sound vs Heat

In this joint publication Steffen clarifies whether elastic waves (sound) or heat generates the standing spin waves in a ferrimagnetic insulator.

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"To spin or not to spin"

This paper from Marwan Deb presents laser-based coherent control of high-frequency standing spin waves (SSW) in a ferrimagnetic iron garnet.

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Sketch of the energy transport by electrons and phonons in metallic heterostructures.

Phonons can rule over electrons

Our recent UXRD study reveals that phonons instead of electrons can dominate energy transport in very thin metallic films.

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Congratulations Aleks!!!

This year's Carl Ramsauer award for the most outstanding PhD theses in Brandenburg & Berlin is awarded to Aleks! He definitely deserves this honour! Congrats from all of us and thanks for your uncountable contributions to the group and its research!

Congratulations Steffen!!!

We are very happy to announce that Steffen successfully defended his PhD thesis! Thanks Steffen for advancing the group!