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The geometric phase and the dynamics of quantum phase transition induced by a linear quench

机译:量子相变的几何相位和动力学诱导   通过线性淬火

摘要

We have analysed here the role of the geometric phase in dynamical mechanismof quantum phase transition in the transverse Ising model. We have investigatedthe system when it is driven at a fixed rate characterized by a quench time$\tau_q$ across the critical point from a paramagnetic to ferromagnetic phase.Our argument is based on the fact that the spin fluctuation occurring duringthe critical slowing down causes random fluctuation in the ground stategeometric phase at the critical regime. The correlation function of the randomgeometric phase determines the excitation probability of the quasiparticles,which are excited during the transition from the inital paramagnetic to theferromagnetic phase. This helps us to evaluate the number density of the kinksformed during the transition, which is found to scale as$\tau_q^{-\frac{1}{2}}$. In addition, we have also estimated the spin-spincorrelation at criticality.
机译:我们在这里分析了横向伊辛模型中几何相位在量子相变动力学机制中的作用。我们研究了系统以固定速率驱动时的特征,该速率的特征是从顺磁到铁磁相跨越临界点的淬灭时间$ \ tau_q $。我们的论据基于以下事实:在临界减速期间发生的自旋波动会导致随机临界状态下基态几何相位的波动。随机几何相位的相关函数确定了准粒子的激发概率,这些准粒子在从初始顺磁性相到铁磁性相的过渡过程中被激发。这有助于我们评估过渡期间形成的纽结的数量密度,发现其缩放比例为$ \ tau_q ^ {-\ frac {1} {2}} $。此外,我们还估计了临界时的自旋-自旋相关性。

著录项

  • 作者

    Basu, B.; Bandyopadhyay, P.;

  • 作者单位
  • 年度 2010
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  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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