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EnglishWe 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.
| Titolo: | Adiabatic dynamics in a spin-1 chain with uniaxial single-spin anisotropy |
| Autori: | |
| Data di pubblicazione: | 2009 |
| Rivista: | |
| 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. |
| Handle: | http://hdl.handle.net/11384/10455 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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