VorDIST · Quantum transport in a disordered two-dimensional ultracold Fermi gas
Horizon 2020 — Marie Skłodowska-Curie Actions
- Duration
- 2019-09-01 → 2021-08-31
- EU contribution
- €183,473
- Participants
- 1
- Scheme
- MSCA-IF-EF-ST
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Results in brief
Quantum transport in a disordered two-dimensional ultracold Fermi gas
The field of ultracold atoms has undergone rapidly diversifying research subjects during the last decade, flourishing across quantum optics, quantum information, condensed matter physics, quantum chemistry, etc. Meanwhile, thanks to the recent technological advancements such as high-resolution microscope systems and digital micromirror devices, arbitrary manipulation and engineering of optical potentials at short-length scales in atomic systems have become more available. These developments indeed allow for more systematic experimental studies that have been practically challenging. In this project, the main objectives are to resolve compelling questions on quantum transport phenomena in strongly correlated superfluids by maximally utilizing the controllability and tunability of atomic quantum gases. First, we have addressed the problems of measuring condensate fraction in strongly interacting superfluids with dc Josephson supercurrent. Second, We have revealed the details of quantum vortex decay by building a programmable vortex collider in a homogeneous, planar superfluid. Our experimental work constitutes a clear step beyond the state of the art, which could deepen our understanding of quantum transport.
Data: CORDIS, © European Union
Project objective
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.
Original text from CORDIS.
Participants
- CONSIGLIO NAZIONALE DELLE RICERCHE · RomaCoordinatorItaly
Links
Data: CORDIS, © European Union