10.1103/PhysRevB.99.064428
Mentink, Johann H
Johann H
Mentink
Katsnelson, Mikhail
Mikhail
Katsnelson
Lemeshko, Mikhail
Mikhail
Lemeshko
Quantum many-body dynamics of the Einstein-de Haas effect
APS
2019
2019-03-10T22:59:20Z
2020-01-21T13:21:14Z
journal_article
https://research-explorer.app.ist.ac.at/record/6092
https://research-explorer.app.ist.ac.at/record/6092.json
1802.01638
In 1915, Einstein and de Haas and Barnett demonstrated that changing the magnetization of a magnetic material results in mechanical rotation and vice versa. At the microscopic level, this effect governs the transfer between electron spin and orbital angular momentum, and lattice degrees of freedom, understanding which is key for molecular magnets, nano-magneto-mechanics, spintronics, and ultrafast magnetism. Until now, the timescales of electron-to-lattice angular momentum transfer remain unclear, since modeling this process on a microscopic level requires the addition of an infinite amount of quantum angular momenta. We show that this problem can be solved by reformulating it in terms of the recently discovered angulon quasiparticles, which results in a rotationally invariant quantum many-body theory. In particular, we demonstrate that nonperturbative effects take place even if the electron-phonon coupling is weak and give rise to angular momentum transfer on femtosecond timescales.