Title: Enhanced antiferromagnetism driven by superexchange interaction in a three-component Fermi-Hubbard model
Author：Ren Liao1, Jingxin Sun1, Pengju Zhao2, Shifeng Yang1, Hui Li1, Xinyi Huang1, Wei Xiong1, Xiaoji Zhou1, Dingping Li2, Xiongjun Liu2 and Xuzong Chen1
1. School of Electronics, Peking University, Beijing 100871, China;
2. School of Physics, Peking University, Beijing 100871, China;
Abstract: The low-energy effective XXZ model of a three-component Fermi-Hubbard model is analyzed at a Mott-insulator regime where each lattice site is filled with either a single atom or an atom pair. We find the nearest-neighbor spin-exchange interaction can be strongly reduced with atoms paired, while the diagonal antiferromagnetic interaction remains unaffected. Therefore, the antiferromagnetism of such a three-component Fermi-Hubbard model can be stronger than that of a typical two-component Fermi-Hubbard model at the half-filling regime. And we discussed the possible realization with 6-Li atoms under a proper external magnetic field where the three-body loss rate is small. Our results may be useful for experimental observation of the long-range antiferromagnetic order of ultracold neutral fermions at low temperature.
Key words: Antiferromagnetism; Fermi Hubbard model;
|Presenter name||Ren Liao|
|How will you attend ICAP-27?||I am planning on virtual registration for online attendance|