Many-body dynamical delocalization in a kicked one-dimensional ultracold gas
Many-body dynamical delocalization in a kicked one-dimensional ultracold gas
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DOI：
10.1038/s41567-022-01721-w
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发表时间：
2022-09
期刊：
影响因子：
19.6
通讯作者：
Jun Hui See Toh;K. McCormick;Xinxin Tang;Ying Su;Xiwang Luo;Chuanwei Zhang;Subhadeep Gupta
中科院分区：
文献类型：
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作者：
Jun Hui See Toh;K. McCormick;Xinxin Tang;Ying Su;Xiwang Luo;Chuanwei Zhang;Subhadeep Gupta
与表现出混沌行为和扩散能量增长的受驱动经典系统相反，被踢量子系统可以表现出动态局域的出现，这限制了能量的吸收，并导致了遍历性的崩溃。在多体相互作用存在的情况下，动力学局域态的演化长期以来一直是一个悬而未决的问题。在这里，我们实验研究了脉冲光学晶格周期性激发的一维相互作用超冷气体，观察到了相互作用驱动的动力学离域和多体量子混沌的出现。观察到的动力学特征是在一个很大的相互作用和踢力参数范围内亚扩散能量增长。这些结果揭示了量子多体系统中相互作用驱动的输运现象，在这个系统中，理论方法极具挑战性，并提供了相互矛盾的预测。
Contrary to a driven classical system that exhibits chaotic behaviour and diffusive energy growth, a kicked quantum system can exhibit the emergence of dynamical localization, which limits energy absorption and leads to the breakdown of ergodicity, , –. The evolution of dynamically localized states in the presence of many-body interactions has long remained an open question, –. Here we experimentally study an interacting one-dimensional ultracold gas periodically kicked by a pulsed optical lattice and observe the interaction-driven emergence of dynamical delocalization and many-body quantum chaos. The observed dynamics feature sub-diffusive energy growth over a broad parameter range of interaction and kick strengths. These results shed light on interaction-driven transport phenomena in quantum many-body systems, in a regime where theoretical approaches are extremely challenging and provide conflicting predictions.