We study the adiabatic quantum dynamics of an anisotropic spin-1 XY chain across a second-order quantum phase transition. The system is driven out of equilibrium by performing a quench on the uniaxial single-spin anisotropy, that is supposed to vary linearly in time. We show that, for sufficiently large system sizes, the excess energy after the quench admits a non-trivial scaling behavior that is not predictable by standard Kibble–Zurek arguments for isolated critical points or extended critical regions. This emerges from a competing effect of many accessible low-lying excited states, inside the whole continuous line of critical points.

Adiabatic dynamics in a spin-1 chain with uniaxial single-spin anisotropy

ROSSINI, DAVIDE;FAZIO, ROSARIO;
2009

Abstract

We study the adiabatic quantum dynamics of an anisotropic spin-1 XY chain across a second-order quantum phase transition. The system is driven out of equilibrium by performing a quench on the uniaxial single-spin anisotropy, that is supposed to vary linearly in time. We show that, for sufficiently large system sizes, the excess energy after the quench admits a non-trivial scaling behavior that is not predictable by standard Kibble–Zurek arguments for isolated critical points or extended critical regions. This emerges from a competing effect of many accessible low-lying excited states, inside the whole continuous line of critical points.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/1432
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