Quantum-gas mixtures with extreme mass imbalance

在这个项目中，我们的目标是研究具有极端质量不平衡的原子玻色-费米量子气体混合物的热化动力学和输运。这种不平衡自然导致多体系统中时间尺度的非常明显的异质性。据预测，这种情况将表现出非常缓慢的动力学，特殊的流体力学行为和准局域化。我们将研究最初脱离平衡的轻费米子的弛豫动力学，这些费米子浸泡在重玻色子的浴中。首先，我们将在谐波阱中实现类似Fröhlich极化子场景的准均匀设置。然后，我们将继续在光学晶格中加载原子，以研究由于实际不动玻色子实现的动态约束而产生的准局域化。我们将与研究单位的几个理论伙伴密切合作，对两种情况下观察到的时间尺度进行建模和解释，并了解动力学约束在系统中的作用。

In this project we aim to study thermalization dynamics and transport in an atomic Bose-Fermi quantum gas mixture with extreme mass imbalance. The imbalance naturally leads to a very pronounced heterogeneity of timescales in the many-body system. Such a scenario has been predicted to show very slow dynamics, peculiar hydrodynamic behavior and quasi-localization. We will study the relaxation dynamics of light fermions initially brought out of equilibrium, which are immersed in a bath of heavy bosons. First, we will realize a quasi-homogeneous setting in a harmonic trap resembling the Fröhlich polaron scenario for a certain set of parameters. We will then move forward and load the atoms in an optical lattice to study quasi-localization due to dynamic constraints realized by the practically immobile bosons. We will work in close collaboration with several theory partners of the research unit to model and interpret the observed timescales in both settings and to understand the role of kinetic constraints in the system.