1. Real-time observation of non-equilibrium phonon-electron energy and angular momentum flow in laser-heated nickel
- Author
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Shokeen, Vishal, Heber, Michael, Kutnyakhov, Dmytro, Wang, Xiaocui, Yaroslavtsev, Alexander, Maldonado, Pablo, Berritta, Marco, Wind, Nils, Wenthaus, Lukas, Pressacco, Federico, Min, Chul-Hee, Nissen, Matz, Mahatha, Sanjoy K., Dziarzhytski, Siarhei, Oppeneer, Peter M., Rossnagel, Kai, Elmers, Hans-Joachim, Schönhense, Gerd, Dürr, Hermann, Shokeen, Vishal, Heber, Michael, Kutnyakhov, Dmytro, Wang, Xiaocui, Yaroslavtsev, Alexander, Maldonado, Pablo, Berritta, Marco, Wind, Nils, Wenthaus, Lukas, Pressacco, Federico, Min, Chul-Hee, Nissen, Matz, Mahatha, Sanjoy K., Dziarzhytski, Siarhei, Oppeneer, Peter M., Rossnagel, Kai, Elmers, Hans-Joachim, Schönhense, Gerd, and Dürr, Hermann
- Abstract
Identifying the microscopic nature of non-equilibrium energy transfer mechanisms among electronic, spin, and lattice degrees of freedom is central to understanding ultrafast phenomena such as manipulating magnetism on the femtosecond timescale. Here, we use time- and angle-resolved photoemission spectroscopy to go beyond the often-used ensemble-averaged view of non-equilibrium dynamics in terms of quasiparticle temperature evolutions. We show for ferromagnetic Ni that the non-equilibrium electron and spin dynamics display pronounced variations with electron momentum, whereas the magnetic exchange interaction remains isotropic. This highlights the influence of lattice-mediated scattering processes and opens a pathway toward unraveling the still elusive microscopic mechanism of spin-lattice angular momentum transfer.
- Published
- 2024
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