Itinerant ferromagnetism entrenched by the anisotropy of spin-orbit coupling in a dipolar Fermi gas  

作　　者：Xue-Jing Feng Jin-Xin Li Lu Qin Ying-Ying Zhang ShiQiang Xia Lu Zhou ChunJie Yang ZunLue Zhu Wu-Ming Liu Xing-Dong Zhao 

机构地区：[1]School of Physics,Henan Normal University,Xinxiang 453000,China [2]Department of Physics,School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China [3]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Frontiers of physics》2023年第5期227-235,共9页物理学前沿(英文版)

基　　金：supported by the National Key R&D Program of China(Grant Nos.2021YFA1400900,2021YFA0718300,and 2021YFA1400243);the Key Scientific Research Project of colleges and Universities in Henan Province(Nos.20A140018 and 23A140001);the National Natural Science Foundatiion of China(Grant Nos.12074105,12074106,12074120,12247146,12104135,and 61835013);the Natural Science Foundation of Shanghai(Grant No.20ZR1418500).

摘　　要：We investigate the itinerant ferromagnetism in a dipolar Fermi atomic system with the anisotropic spin–orbit coupling(SOC),which is traditionally explored with isotropic contact interaction.We first study the ferromagnetism transition boundaries and the properties of the ground states through the density and spin-flip distribution in momentum space,and we find that both the anisotropy and the magnitude of the SOC play an important role in this process.We propose a helpful scheme and a quantum control method which can be applied to conquering the difficulties of previous experimental observation of itinerant ferromagnetism.Our further study reveals that exotic Fermi surfaces and an abnormal phase region can exist in this system by controlling the anisotropy of SOC,which can provide constructive suggestions for the research and the application of a dipolar Fermi gas.Furthermore,we also calculate the ferromagnetism transition temperature and novel distributions in momentum space at finite temperature beyond the ground states from the perspective of experiment.

关 键 词：itinerant ferromagnetism spin-orbit coupling cold atom quantum simulation dipolar Fermi gas dipole-dipole interaction 

分 类 号：O469[理学—凝聚态物理]