Title: Search for New Physics with Atomic Magnetometers

Speaker: Wei Ji（季伟），Helmholtz Institute Mainz

Time: 2:00 pm, Mar 9 (Thursday) 2023

Location: 理科楼C109

Abstract: Tabletop precision measurements provide powerful tools to search for new physics beyond the standard model, such as dark matter and exotic spin-dependent interactions (5th force). The exotic spin-dependent interaction may be mediated by new ultralight bosons, such as axion or Z', which are also proposed as dark matter candidates. In this talk, I will introduce ultra-high sensitivity alkali-noble gas atomic magnetometers [2,5] and their application in searching for exotic spin-dependent force [1-5]. Our recent experiments set stringent limits on different terms of exotic forces between electron-electron [4], neutron-neutron [3,5], or electron-proton [1]. These experimental results represent orders of magnitude improvement by other lab-based experiments. For the Z' boson-mediated term, our result can surpass the limits set by astrophysical methods [3].