Slow Quenches in the Band Insulator Described by the Su–Schrieffer–Heeger Model

Marinček, Sara Pia; Mravlje, Jernej; Rejec, T.

doi:10.1002/pssb.201900425

Cited by 2 publications

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References 35 publications

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“…An important observation of interest to this paper was made in Refs. [35,38,[44][45][46] which showed that the number of excitations after a slow quench follows the Kibble-Zurek (KZ) scaling.…”

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Kibble-Zurek behavior in disordered Chern insulators

Ulčakar,

Mravlje,

Rejec

2020

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Even though no local order parameter in the sense of the Landau theory exists for topological quantum phase transitions in Chern insulators, the highly non-local Berry curvature exhibits critical behavior near a quantum critical point. We investigate the critical properties of its real space analog, the local Chern marker, in weakly disordered Chern insulators. Due to disorder, inhomogeneities appear in the spatial distribution of the local Chern marker. Their size exhibits power-law scaling with the critical exponent matching the one extracted from the Berry curvature of a clean system. We drive the system slowly through such a quantum phase transition. The characteristic size of inhomogeneities in the non-equilibrium post-quench state obeys the Kibble-Zurek scaling. In this setting, the local Chern marker thus does behave in a similar way as a local order parameter for a symmetry breaking second order phase transition. The Kibble-Zurek scaling also holds for the inhomogeneities in the spatial distribution of excitations and of the orbital polarization.

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confidence: 99%