Slow quenches in Chern insulator ribbons

Abstract

We investigate slow quenches in Chern insulators in ribbon geometry. We consider the Qi-Wu-Zhang model and slowly ramp the parameters (large time of the quench $\tau$) from a non-topological (Chern number = 0) to a topological regime (Chern number $\ne$ 0). In contrast to the Haldane model considered in [L. Privitera and G. E. Santoro, Phys. Rev. B 93, 241406(R) (2016)] earlier, the in-gap state degeneracy point is pinned to an inversion symmetric momentum, which changes the behavior drastically. The density of excitations in the in-gap states scales with the quench time as ${\tau }^{-1/2}$ as the ramp becomes slow, and the Kibble-Zurek mechanism applies. Despite the slower scaling of the density of in-gap excitations with $\tau$, the Hall conductance after the quench deviates from that of the ground state of the final Hamiltonian by an amount that drops as ${\tau }^{-1}$.

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Cited by in corpus (7)

• Kibble-Zurek behavior in disordered Chern insulators
• Kibble-Zurek scaling immune to anti-Kibble-Zurek behavior in driven open systems at the limit of loss difference
• Universal Landau-Zener regimes in dynamical topological phase transitions
• Kibble-Zurek behavior in a topological phase transition with a quadratic band crossing
• Quantum anomalous Hall domains in a Quenched Topological Mott Insulator
• Anomalous Dynamical Scaling at Topological Quantum Criticality
• Finite-rate quench in disordered Chern and $Z_2$ topological insulators