论文标题
受破坏性多体干扰保护的可稳定顺序
Metastable order protected by destructive many-body interference
论文作者
论文摘要
亚能的现象可以在所有时间和空间尺度上塑造动态过程。在这里，我们通过将超电位骨气原子从光学晶格的最低带泵送到激发带，通过振动带的突然淬灭，从而诱导亚稳态动力学。最低带的随后的放松过程显示了一系列阶段，其中包括亚稳态阶段，在此期间，激发带的原子损失得到了强烈抑制。使用经典的场模拟和分析论证，我们为这种实验观察提供了一个解释，其中我们表明，激发带中原子的瞬态凝结状态是一个黑暗状态，即碰撞衰减和隧穿至低能量轨道。因此，由于凝结状态的手性相模式，亚稳态通过破坏性干扰稳定。我们的实验和理论研究提供了对多体松弛动力学范式示例的不同阶段的详细理解。
The phenomenon of metastability can shape dynamical processes on all temporal and spatial scales. Here, we induce metastable dynamics by pumping ultracold bosonic atoms from the lowest band of an optical lattice to an excitation band, via a sudden quench of the unit cell. The subsequent relaxation process to the lowest band displays a sequence of stages, which include a metastable stage, during which the atom loss from the excitation band is strongly suppressed. Using classical-field simulations and analytical arguments, we provide an explanation for this experimental observation, in which we show that the transient condensed state of the atoms in the excitation band is a dark state with regard to collisional decay and tunneling to a low-energy orbital. Therefore the metastable state is stabilized by destructive interference due to the chiral phase pattern of the condensed state. Our experimental and theoretical study provides a detailed understanding of the different stages of a paradigmatic example of many-body relaxation dynamics.
