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Quench dynamics near a quantum critical point

机译:量子临界点附近的猝灭动力学

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摘要

We study the dynamical response of a system to a sudden change of the tuning parameter X starting (or ending) at the quantum critical point. In particular, we analyze the scaling of the excitation probability, number of excited quasiparticles, heat and entropy with the quench amplitude, and the system size. We extend the analysis to quenches with arbitrary power law dependence on time of the tuning parameter, showing a close connection between the scaling behavior of these quantities with the singularities of the adiabatic susceptibilities of order m at the quantum critical point, where m is related to the power of the quench. Precisely for sudden quenches, the relevant susceptibility of the second order coincides with the fidelity susceptibility. We discuss the generalization of the scaling laws to the finite-temperature quenches and show that the statistics of the low-energy excitations becomes important. We illustrate the relevance of those results for cold-atom experiments.
机译:我们研究了系统对在量子临界点处开始(或结束)调谐参数X突然变化的动力响应。特别地,我们分析了激发概率,激发的准粒子的数量,具有淬灭幅度的热和熵以及系统大小的标度。我们将分析扩展到具有依赖于调整参数时间的任意幂定律的淬灭,表明这些量的缩放行为与在量子临界点处的量级为m的绝热磁化率的奇异性紧密相关,其中m与淬灭的力量。精确地针对突然淬火,二阶的相关磁化率与保真度磁化率一致。我们讨论了将定标律推广到有限温度淬火的方法,并表明低能激发的统计数据很重要。我们说明了这些结果与冷原子实验的相关性。

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  • 来源
    《Physical review》 |2010年第1期|012303.1-012303.4|共4页
  • 作者单位

    Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA;

    Department of Physics, University of Fribourg, Chemin du Musee 3, 1700 Fribourg, Switzerland;

    Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA;

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