Browsing by Subject "Harmonic confinement"

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    Nonequilibrium fractional Hall response after a topological quench
    (American Physical Society, 2016) Ünal, F. N.; Mueller, E. J.; Oktel, M. O.
    We theoretically study the Hall response of a lattice system following a quench where the topology of a filled band is suddenly changed. In the limit where the physics is dominated by a single Dirac cone, we find that the change in the Hall conductivity is two-thirds of the quantum of conductivity. We explore this universal behavior in the Haldane model and discuss cold-atom experiments for its observation. Beyond the linear response, the Hall effect crosses over from fractional to integer values. We investigate finite-size effects and the role of harmonic confinement.