SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: Mini-Symposium: Ultrafast surface dynamics at the space-time limit II
O 15.1: Hauptvortrag
Montag, 1. März 2021, 13:30–14:00, R1
The ultrafast Einstein-de Haas effect triggered by ultrafast demagnetization — •Steven L. Johnson1,4, Christian Dornes1, Yves Acremann2, Matteo Savoini1, Martin Kubli1, Martin J. Neugebauer1, Elsa Abreu1, Lucas Huber1, Gabriel Lantz1, Carlos A. F. Vaz3, Henrik Lemke4, Elizabeth M. Bothschafter3, Michael Porer3, Vincent Esposito3, Laurenz Rettig3,5, Michael Buzzi3,6, Aurora Alberca3, Yoav W. Windsor3,5, Paul Beaud4, Urs Staub3, Diling Zhu7, Sanghoon Song7, and James M. Glownia7 — 1Institute for Quantum Electronics, Physics Department, ETH Zurich, Zurich, Switzerland — 2Laboratory for Solid State Physics, Physics Department, ETH Zurich, Zurich, Switzerland — 3Swiss Light Source, Paul Scherrer Institute, Villigen, Switzerland — 4SwissFEL, Paul Scherrer Institute, Villigen, Switzerland — 5Fritz Haber Institute of the Max Planck Society, Berlin, Germany — 6Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany — 7Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, CA, USA
The Einstein-de Haas effect is a historically important experiment that demonstrated clearly the equivalence between spin angular momentum and mechanical angular momentum. Here I discuss an experiment where ultrafast demagnetization driven by laser excitation of a thin film of iron drives transverse atomic displacement waves from the interfaces of the film, a direct consequence of sub-picosecond angular momentum transfer from electronic spins to the lattice.