Topological pumping of a 1D dipolar gas into strongly correlated prethermal states
Topological pumping of a 1D dipolar gas into strongly correlated prethermal states
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DOI：
10.1126/science.abb4928
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发表时间：
2021-01
期刊：
影响因子：
56.9
通讯作者：
Wil Kao;Kuan-Yu Li;K. Lin;S. Gopalakrishnan;B. Lev
中科院分区：
文献类型：
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作者：
Wil Kao;Kuan-Yu Li;K. Lin;S. Gopalakrishnan;B. Lev
大多数非平衡的多粒子系统最终会达到热态。然而，一些一维量子系统不会热化，尽管它们可能会进入长期平衡状态。Kao等人研究了这样一个系统，该系统由限制在光学势中的偶极镝原子组成，该光学势的形状像一个二维的细长管阵列。作者以规定的方式循环原子之间的接触相互作用，创造出越来越多的激发非热量子多体态。循环偶极镝原子之间的接触相互作用产生一系列激发的非热量子态。相互作用量子系统的长寿命激发态保持量子关联并避免热化是非常重要的。我们通过稳定超Tonks-Girardeau气体以防止长程偶极相互作用的坍缩和热化，在镝的玻色子一维（1D）量子气体中创建非热态。刚度和能量每粒子的测量表明，该系统是动态稳定的，无论接触相互作用的强度。这使我们能够循环接触相互作用，从弱到强排斥，然后是强吸引，最后是弱吸引。我们表明，这个周期是一个能量空间拓扑泵（量子holonomy造成的）。迭代这个循环提供了一个未探索的拓扑泵浦方法，以创建一个层次的日益兴奋的预热状态。
Making a quantum pump Most nonequilibrium, many-particle systems eventually reach a thermal state. However, some one-dimensional quantum systems do not thermalize, although they may settle into a long-term equilibrium state. Kao et al. studied such a system consisting of dipolar dysprosium atoms confined in an optical potential shaped like a two-dimensional array of elongated tubes. The authors cycled the contact interaction between the atoms in a prescribed way, creating increasingly excited nonthermal quantum many-body states. Science, this issue p. 296 Cycling the contact interaction between dipolar dysprosium atoms creates a series of excited nonthermal quantum states. Long-lived excited states of interacting quantum systems that retain quantum correlations and evade thermalization are of great fundamental interest. We create nonthermal states in a bosonic one-dimensional (1D) quantum gas of dysprosium by stabilizing a super-Tonks-Girardeau gas against collapse and thermalization with repulsive long-range dipolar interactions. Stiffness and energy-per-particle measurements show that the system is dynamically stable regardless of contact interaction strength. This enables us to cycle contact interactions from weakly to strongly repulsive, then strongly attractive, and finally weakly attractive. We show that this cycle is an energy-space topological pump (caused by a quantum holonomy). Iterating this cycle offers an unexplored topological pumping method to create a hierarchy of increasingly excited prethermal states.