Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 59: Posters Magnetism III

MA 59.29: Poster

Friday, March 20, 2020, 09:00–12:00, P2/EG

Real-time dynamics of classical spins coupled to the boundary of a Kane-Mele model — •Robin Quade and Michael Potthoff — I. Institute of Theoretical Physics, Department of Physics, Universität Hamburg

The real-time dynamics of the two-dimensional Kane-Mele model with a single or several classical impurity spins coupled to the boundary of the electronic system is investigated numerically. To this end, we employ a high-order Runge-Kutta technique to solve the coupled system of equations of motion, i.e., the canonical equations of motion for the classical spin dynamics and the Liouville-type equation for the one-particle reduced density matrix of the electronic system.

At each instant of time, the classical impurity spins act as local magnetic fields and thus, via the Kondo-like exchange coupling, locally break time-reversal symmetry (TRS). We consider the topologically nontrivial phase of the Kane-Mele model and study the impact of the bulk-boundary correspondence and the spin-momentum locking of the TRS-protected surface states on the real-time dynamics of the impurity spins.