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- W2801491115 abstract "We study the equilibrium and dynamical properties of a ferromagnetic spinor atomic Bose-Einstein condensate. In the vicinity of the critical point for a continuous quantum phase transition, universal behaviors are observed both in the equilibrium state and in the dynamics when the quadratic Zeeman shift is swept linearly. Three distinct dynamical regions are identified for different sweeping time scales ($tau$), when compared to the time scale $tau_{rm KZ}sim N^{(1+nu z)/nu d}$ decided by external driving in a system with finite size $N$ ($nu,z$ are critical exponents and $d$ the dimensionality). They are manifested by the excitation probability $mathcal{P}$ and the excess heat density $mathcal{Q}$. The adiabatic region of $,mathcal{P}simmathcal{Q}simtau^{-2},$ follows from the adiabatic perturbation theory when $tau >tau_{rm KZ}$, while the non-adiabatic universal region of $,mathcal{P}simmathcal{Q}simtau^{-1},$ in the thermodynamic limit is described by the Kibble-Zurek mechanism when $tau_{rm KZ}>tau >$ the time scale given by initial gap. The Kibble-Zurek scaling hypothesis is augmented with finite-size scaling in the latter region and several experimentally falsifiable features for the finite system we consider are predicted. The region of the fastest sweeping is found to be non-universal and far-from-equilibrium with $mathcal{P}$ and $mathcal{Q}$ essentially being constants independent of $tau$." @default.
- W2801491115 created "2018-05-17" @default.
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- W2801491115 date "2018-07-17" @default.
- W2801491115 modified "2023-10-16" @default.
- W2801491115 title "Universal driven critical dynamics across a quantum phase transition in ferromagnetic spinor atomic Bose-Einstein condensates" @default.
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- W2801491115 doi "https://doi.org/10.1103/physreva.98.013619" @default.
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