VorDIST · Quantum transport in a disordered two-dimensional ultracold Fermi gas

Disorder is omnipresent in nature and has a strong impact on quantum materials. The paradigmatic example is Anderson localization of a single particle but many more intriguing situations can arise for many-body systems depending on the interplay between interaction and disorder. The metal-insulator and superconductor-insulator transitions, which highlighted the importance of interaction, still remain enigmatic phenomena. Another profound effect of disorder in superconductors takes place in type-II superconductors, which involve quantum vortices. A quantum vortex in a superconductor is highly influenced by the presence of defects and its mobility is the key ingredient for superconductivity. Despite its importance, a clear understanding of disorder physics is still lacking because of unavoidable complexities in condensed matter systems. In this project, we explore disorder physics with ultracold atomic gas.The ultracold atomic gas system has been recognized as an excellent quantum simulator because it provides an unprecedentedly controllable and clean testbed. Quantum simulations with quantum gas have successfully addressed important, yet unsolved physical problems in many different fields. Here, we will carry out experimental studies of two-dimensional (2D) Fermionic quantum gas under disorder potential. Our first goal is the observation of 2D Anderson localization. Then we will further investigate the interplay between interaction and disorder. We aim to reveal the robustness of the order parameter of superfluid when the superfluid is transformed into an insulating phase. Next, we will obtain a phase diagram of a disordered 2D system. Lastly, we want to address the paradigmatic problems of vortex matter in a superconductor, both in a single and a bilayer system. Thus, we can unveil vortex dynamics in disordered superfluids.