Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 50: Ultra-cold atoms, ions, and BEC VI (joint session A/Q)
Q 50.4: Talk
Thursday, March 12, 2020, 15:00–15:15, f303
Bilayer Fermi - Hubbard physics with a quantum gas microscope — •Sarah Hirthe1, Joannis Koepsell1, Dominik Bourgund1, Jayadev Vijayan1, Pimonpan Sompet1, Guillaume Salomon1, Immanuel Bloch1,2, and Christian Gross1,3 — 1Max-Planck-Institute of Quantum Optics — 2Ludwig-Maximilians Universität München — 3Eberhard Karls Universität Tübingen
The bilayer Fermi-Hubbard model is of special interest for quantum simulation, as bilayered structures are prominent in materials such as the high-Tc superconducting cuprates. We have recently upgraded our Fermi gas microscope with a highly stable vertical superlattice, which now allows us full control over a strongly interacting fermionic bilayer system. We investigate the bilayer phase diagram by probing the Mott insulator to band insulator as well as the metal to band insulator transition. We confirm the expected transition point at an interlayer coupling of four times the intralayer coupling. Furthermore, making use of the full control over the lattice potential, we demonstrate a new technique based on topological charge pumping to reach single-site resolution of each layer. We benchmark the power of this technique by applying it to fully spin resolve a two-dimensional system. We find a strongly correlated system at temperatures consistent with the coldest temperatures reported in cold atoms.