Search for topological defect of axionlike model with cesium atomic comagnetometer  

作　　者：Yucheng Yang Teng Wu Jianwei Zhang Hong Guo 杨雨成;吴腾;张建玮;郭弘(State Key Laboratory of Advanced Optical Communication Systems and Networks,Department of Electronics,and Center for Quantum Information Technology,Peking University,Beijing 100871,China;School of Physics,Peking University,Beijing 100871,China)

机构地区：[1]State Key Laboratory of Advanced Optical Communication Systems and Networks,Department of Electronics,and Center for Quantum Information Technology,Peking University,Beijing 100871,China [2]School of Physics,Peking University,Beijing 100871,China

出　　处：《Chinese Physics B》2021年第5期157-164,共8页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.62071012);the National Science Fund for Distinguished Young Scholars of China(Grant No.61225003);National Hi-Tech Research and Development Program of China.

摘　　要：Many terrestrial experiments have been designed to detect domain walls composed of axions or axionlike particles(ALPs), which are promising candidates of dark matter. When the domain wall crosses over the Earth, the pseudoscalar field of ALPs could couple to the atomic spins. Such exotic spin-dependent couplings can be searched for by monitoring the transient-in-time change of the atomic spin precession frequency in the presence of a magnetic field. We propose here a single-species cesium atomic comagnetometer, which measures the spin precession frequencies of atoms in different ground-state hyperfine levels, to eliminate the common-mode magnetic-field variations and search for the exotic nonmagnetic couplings solely between protons and ALPs. With the single-species atomic comagnetometer, we experimentally rule out the possibility that the decay constant of the linear pseudoscalar couplings of ALPs to protons is fp■ 3.71 ×107 Ge V. The advanced system has the potential to constrain the constant to be fp■ 10.7 × 109 Ge V, promising to improve astrophysical constraint level by at least one order of magnitude. Our system could provide a sensitive detection method for the global network of optical magnetometers to search for exotic physics.

关 键 词：atomic comagnetometer atomic magnetometer domain wall axions and axionlike particles 

分 类 号：TH763.1[机械工程—仪器科学与技术]