Quantum Quench and Nonequilibrium Dynamics in Lattice-Confined Spinor Condensates
Quantum Quench and Nonequilibrium Dynamics in Lattice-Confined Spinor Condensates
复制标题
晶格限制旋量凝聚中的量子淬灭和非平衡动力学
DOI：
10.1103/physrevlett.123.113002
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发表时间：
2019
影响因子：
8.6
通讯作者：
Liu, Y.
中科院分区：
文献类型：
--
作者：
Chen, Z.;Tang, T.;Austin, J.;Shaw, Z.;Zhao, L.;Liu, Y.
本文研究了立方晶格中旋量凝聚体在超流到Mott绝缘体相变中猝灭后的非平衡动力学。复杂的动力学组成的自旋混合振荡在多个频率观察到的时间演化的旋量凝聚体定位在深晶格量子淬火后。类似的自旋动力学也出现在MI相中的旋量气体通过淬灭磁场突然远离它们的基态之后。我们确认这些观察到的自旋混合动力学的光谱可以用来揭示一个非均匀系统的原子数分布，并研究从两体到多体动力学的转变。我们的数据还表明，非平衡动力学弱依赖于淬火速度，但强烈的晶格势。这使得能够精确测量自旋相关的相互作用，这是决定旋量物理的关键参数。
We present an experimental study on nonequilibrium dynamics of a spinor condensate after it is quenched across a superfluid to Mott insulator (MI) phase transition in cubic lattices. Intricate dynamics consisting of spin-mixing oscillations at multiple frequencies are observed in time evolutions of the spinor condensate localized in deep lattices after the quantum quench. Similar spin dynamics also appear after spinor gases in the MI phase are suddenly moved away from their ground states via quenching magnetic fields. We confirm these observed spectra of spin-mixing dynamics can be utilized to reveal atom number distributions of an inhomogeneous system, and to study transitions from two-body to many-body dynamics. Our data also imply the nonequilibrium dynamics depend weakly on the quench speed but strongly on the lattice potential. This enables precise measurements of the spin-dependent interaction, a key parameter determining the spinor physics.