论文标题
统一玻色气的累积理论：prethermal和efimovian动力学
Cumulant theory of the unitary Bose gas: Prethermal and Efimovian dynamics
论文作者
论文摘要
我们研究退化的超电压气体对单位状态的淬火，在量子力学中，相互作用与量子一样强。我们奠定了累积理论的基础，能够同时捕获三体efimov效应和千古化进化。最初的量子耗竭时期后，建立了以动力学温度和出现的Bogoliubov分散性质的特征，而微观自由度则保持远距离平衡。然后，在多体哈密顿人中的高阶相互作用项破坏了整合性，从而导致动力依赖于权力定律的动量偏离，而在很大程度上却在占领数量的指数行为上衰减。我们还发现了Efimov效应在多体动力学中的特征，并在观察到的跳动现象与Efimov Trimer的结合能之间进行了精确的识别。在整个工作中，我们对均匀气体的预测与均匀电位中淬火的单位体气气体的实验结果相比进行了定量的预测。
We study the quench of a degenerate ultracold Bose gas to the unitary regime, where interactions are as strong as allowed by quantum mechanics. We lay the foundations of a cumulant theory able to capture simultaneously the three-body Efimov effect and ergodic evolution. After an initial period of rapid quantum depletion, a universal prethermal stage is established characterized by a kinetic temperature and an emergent Bogoliubov dispersion law while the microscopic degrees of freedom remain far-from-equilibrium. Integrability is then broken by higher-order interaction terms in the many-body Hamiltonian, leading to a momentum-dependent departure from power law to decaying exponential behavior of the occupation numbers at large momentum. We find also signatures of the Efimov effect in the many-body dynamics and make a precise identification between the observed beating phenomenon and the binding energy of an Efimov trimer. Throughout the work, our predictions for a uniform gas are quantitatively compared with experimental results for quenched unitary Bose gases in uniform potentials.
