3 years ago

Correlated Spin-Flip Tunneling in a Fermi Lattice Gas.

Brian DeMarco, Vito W. Scarola, Hoi-Yun Hui, William Morong, Wenchao Xu

We report the realization of correlated, density-dependent tunneling for fermionic 40K atoms trapped in an optical lattice. By appropriately tuning the frequency difference between a pair of Raman beams applied to a spin-polarized gas, simultaneous spin transitions and tunneling events are induced that depend on the relative occupations of neighboring lattice sites. Correlated spin-flip tunneling is spectroscopically resolved using gases prepared in opposite spin states, and the inferred Hubbard interaction energy is compared with a tight-binding prediction. We show that the laser-induced correlated tunneling process generates doublons via loss induced by light-assisted collisions. Furthermore, by controllably introducing vacancies to a spin-polarized gas, we demonstrate that correlated tunneling is suppressed when neighboring lattice sites are unoccupied.

Publisher URL: http://arxiv.org/abs/1711.02061

DOI: arXiv:1711.02061v1

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