The realization of homogeneous quantum gases in optical box traps has not only brought quantitative advantages to experimental studies of quantum many-body problems but has also revealed surprising results in unexpected areas. Optical boxes have proven to be particularly valuable for exploring stability issues in quantum systems. In this talk, I will primarily focus on the recombination physics of multi-component fermions: (I) the universal recombination law for three particles, involving two identical fermions, which establishes constraints on the stability of repulsive Fermi gases with contact interactions; and (II) the stability of three-component fermions [3]. This latter study has uncovered qualitatively surprising dynamics and presents an open puzzle regarding the three-body recombination of three-component fermions [3]. If time permits, I will also provide a brief overview of some of our other work on strongly driven polarons and the emergence of sound in a tunable Fermi gas.
[1] N. Navon, R.P. Smith, Z. Hadzibabic, Nature Phys. 17, 1334 (2021)
[2] Y. Ji et al., Phys. Lev. Lett 129, 203402 (2022)
[3] G.L. Schumacher et al., arXiv:2301.02237
10 Minute Talk Information:
“Measuring d-wave superconductivity and beyond: efficient global control on optical lattices” by Daniel K. Mark, MIT and Hong-Ye Hu, Harvard
Understanding high-temperature superconductivity by exploring strongly correlated fermionic Hubbard models is a major focus of analog quantum simulation. However, probing and verifying superconducting properties in such systems remains experimentally challenging. In this talk, we introduce a protocol for measuring a broad class of observables in fermionic quantum gas microscopes, including long-range superconducting pairing correlations (after a repulsive-to-attractive mapping). Our protocol only requires global control and the ability to partition the lattice into dimers of two sites and has low sample requirements. We further optimize our pulses for robustness to experimental imperfections such as inhomegeneity of the lattice potential. Our work introduces general tools for manipulating quantum states in analog quantum simulators using limited controls, enhancing their ability to tackle problems such as that of high-temperature superconductivity.
Based on upcoming work with Joyce Kwan, Christian Kokail, Soonwon Choi and Susanne Yelin.