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DTSTART;VALUE=DATE:20190220T171500
DTEND;VALUE=DATE:20190220T181500
UID:4730@agenda.unifr.ch
DESCRIPTION:A single spin exchange coupled to a large conduction-electron system, i.e., the Kondo model, is one of the central paradigms of many-body theory. Here, we study the real-time dynamics of this system by suddenly switching the direction of a magnetic field coupling to the spin. The field polarizes the spin and suppresses Kondo screening. The resulting spin dynamics, precession and damping, is traditionally described by the Landau-Lifschitz-Gilbert equation. Here, we point out some novel and unconventional topological and correlation effects showing up in the dynamics, such as ill-defined Gilbert damping, incomplete spin relaxation and the presence of a geometrical spin torque. It is argued that these effects are important ingredients for a realistic theory of, e.g., nano spintronics devices.
SUMMARY:Effects of topology and correlations in real-time spin dynamics
CATEGORIES:Colloque / Congrès / Forum
LOCATION:PER 08\, 0.51, bâtiment de Physique\, Chemin du Musée 3\, 1700 Fribourg
URL;VALUE=URI:https://agenda.unifr.ch/e/fr/4730
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