Correlated Spin-Flip Tunneling in a Fermi Lattice Gas
Abstract
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.
Keywords
Cite
@article{arxiv.1711.02061,
title = {Correlated Spin-Flip Tunneling in a Fermi Lattice Gas},
author = {Wenchao Xu and William Morong and Hoi-Yun Hui and Vito W. Scarola and Brian DeMarco},
journal= {arXiv preprint arXiv:1711.02061},
year = {2018}
}