Seminarium Optyczne

Abstract: I will give an overview on the experiments in my group with ultracold, quantum degenerate atoms confined to one-dimensional (1D) geometry, with focus on two different model systems. We have realized 1D Hubbard chains and have studied correlated tunneling dynamics when the many-body system is suddenly exposed to a strong force. This has allowed us to observe how interacting quantum particles prepared in the Mott-insulating phase tunnel through multiple wells of the lattice potential in a situation where a single particle cannot move at all [1]. Our studies further comprise the coherent evolution of an interacting superfluid that exhibits Bloch-oscillations modulated by interaction-driven collapse and revival dynamics [2]. In a certain parameter regime, the transition to quantum chaotic behavior can be observed. The second system of interest constitutes a uniform Luttinger liquid with highly tunable interactions. We have probed the dynamics of a strongly coupled impurity atom injected into the liquid and have found an intriguing Bloch-oscillation type motion induced in the correlated system in the absence of an imprinted lattice structure [3].[1] F. Meinert et al., Science 344, 1259 (2014).[2] F. Meinert et al., Phys. Rev. Lett. 112, 193003 (2014).[3] F. Meinert et al., Science 356, 945 (2017).