Berlin 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 38: Ultrafast Magnetization Effects III
MA 38.5: Vortrag
Donnerstag, 21. März 2024, 12:15–12:30, EB 202
Coherent control of nuclear excitons in FeRh — •Sakshath Sadashivaiah1,2, Kai Schlage3, Anjali Panchwanee3, Christina Bömer3, Dietrich Krebs3, Berit Marx-Glowna1,2, Robert Lötzsch4, Lars Bocklage3, Olaf Leupold3, Ilya Sergueev3, and Ralf Röhlsberger1,2,3,4 — 1Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany — 3Deutsches Elektronen Synchrotron, Notkestraße 85, 22607 Hamburg, Germany — 4Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany
The narrow linewidth of Mössbauer resonances (4.5 neV in 57Fe) enables the preparation of well-defined nuclear quantum states, whose energies are addressed by accelerator-driven light sources [1,2]. Laser-induced phase transitions can modify these nuclear excitonic states via the hyperfine interactions [3]. In 57FeRh thin films femtosecond laser pulses cause an isostructural antiferromagnet (AFM) - ferromagnet (FM) phase transition. Simultaneously, the coherence of the nuclear resonant forward scattered photons is changed within 500 ps. By characterizing the (002) diffraction peak of 57FeRh, we demonstrate that the laser pulses can coherently steer the resonant photons from along the AFM phase to the direction corresponding to the FM phase. Thus, we strive to open new pathways for the coherent control of nuclear excitonic states. [1] R. Röhlsberger et al., Science 328, (2010) 1248. [2] K. P. Heeg et al., Nature 590, (2021) 401. [3] S. Sadashivaiah et al., J. Phys. Chem. Lett. 12, (2021) 3240.
Keywords: Mössbauer effect; Nuclear forward scattering; Nuclear quantum states; ultrafast phenomena; coherent control