Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.64: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Real-time dynamics in the two-dimensional Kondo-lattice model with classical spins — •Lena-Marie Gebauer — I. Institut für Theoretische Physik, Universität Hamburg

The two-dimensional ferromagnetic Kondo lattice with localized spins coupled to a system of non-interacting conduction electrons is the prototypical model for layered manganites and can be simulated using ultracold fermions trapped in optical lattices. Here, we present a quantum-classical hybrid theory for the thermodynamics and the real-time dynamics of the model where the spins are treated as classical degrees of freedom.

The equilibrium phase diagram is derived and found to agree well with previous classical Monte-Carlo data [2]. It comprises different phases, an antiferromagnet at half-filling as well as ferromagnetic, incommensurate and phase-separated states. We study the exact real-time dynamics initiated by different parameter quenches.

[1] M. Sayad, M. Potthoff, New J. Phys. 17 (2015) 113058

[2] S. Yunoki et al., Phys. Rev. Lett. 80, 845 (1998)