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Exploring dynamical phase transitions and prethermalization with quantum noise of excitations

机译：利用激发的量子噪声探索动态相变和预热

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摘要

Dynamical phase transitions can occur in isolated quantum systems that are brought out of equilibrium by sudden parameter changes. We discuss the characterization of such dynamical phase transitions based on the statistics of produced excitations. We consider both the O(N) model in the large-N limit and a spin model with long-range interactions and show that the dynamical criticality of their prethermal steady states manifests most dramatically not in the average number of excitations but in their higher moments. We argue that the growth of defect fluctuations carries unique signatures of the dynamical criticality, irrespective of the precise details of the model. Our theoretical results should be relevant to quantum quench experiments with ultracold bosonic atoms in optical lattices.
机译：动态相变可能发生在孤立的量子系统中，这些量子系统由于突然的参数变化而失去了平衡。我们将基于产生的激励的统计数据讨论此类动态相变的表征。我们同时考虑了在大N极限下的O（N）模型和具有长距离相互作用的自旋模型，并表明它们的预热稳态的动态临界性不是在平均激发数上最显着地表现出来，而是在它们更高的时刻表现出来。 。我们认为，缺陷波动的增长带有动力学临界的独特特征，而与模型的精确细节无关。我们的理论结果应与光学晶格中超冷硼原子的量子猝灭实验有关。

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  • 来源
    《Physical review》 |2015年第20期|205136.1-205136.9|共9页
  • 作者

    Pietro Smacchia; Michael Knap; Eugene Demler; Alessandro Silva;

  • 作者单位

    SISSA, International School for Advanced Studies, via Bonomea 265, 34136 Trieste, Italy,Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA;

    Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA,ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA;

    Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA;

    SISSA, International School for Advanced Studies, via Bonomea 265, 34136 Trieste, Italy,Abdus Salam ICTP, Strada Costiera 11, 34100 Trieste, Italy;

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  • 正文语种 eng
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  • 关键词

    boson systems; dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow;

    机译：玻色子系统冷凝物的动态特性;集体和流体动力激励;超流;

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