Quantum Quench of the One-Dimensional Kondo Lattice Model

The remarkable progress in the time-resolved experimental techniques has made it possible to probe ultrafast dynamics in strongly correlated electron materials and quantum quenches in interacting cold atoms. Motivated by recent pump-probe experiments on the ultrafast dynamics of colossal magnetoresistive (CMR) materials~[1,2], here we study the quench dynamics of one-dimensional (1D) ferromagnetic Kondo-lattice model which serves as a useful toy model for CMR transition metal oxides such as mangnites~[3]. The 1D Kondo-lattice model exhibits a rich phase diagram including a ferromagnetic phase, a phase separation regime, and a paramagnetic phase~[3]. Similar phases are believed to also appear in higher dimensional models. Using time-dependent density-matrix renormalization group method, we investigate the nonequilibrium dynamics of spin correlations in quenches from the ferromagnetic to the disordered phases and vice versa. We also present the real-time development of inhomogeneity as the system is quenched into the phase separation regime.

[1] R. D. Averitt, et al. Phys. Rev. Lett. 87, 017401 (2001).
[2] Y. H. Ren, et al. Phys. Rev. B 78, 014408 (2008).
[3] S. Yunoki, et al. Phys. Rev. Lett. 80, 845 (1998).