Improved constraints on exotic spin-dependent interactions are established at the micrometer scale by a magnetometer with ensembles of nitrogen-vacancy (NV) centers in diamond. A thin layer of NV electronic spin ensembles is utilized as the sensor, and a lead sphere is taken as the source of the nucleons. The exotic spin-dependent interactions are explored by detecting the possible effective magnetic fields by the sensor. Stringent bounds on an exotic parity-odd spin- and velocity-dependent interaction are set within the force range from 5 to 500 μm. The upper limit of the corresponding coupling constant, gAegVN, is improved by more than three orders of magnitude at 330 μm. Improved constraints of P,T-violating scalar-pseudoscalar nucleon-electron interactions, are established within the force range from 6 to 45 μm. The limit of the corresponding coupling constant, gSNgPe, is improved by more than one order of magnitude at 30 μm. Our result shows that a magnetometer with a NV ensemble can be a powerful platform for probing exotic spin-dependent interactions.
@article{arxiv.2201.04408,
title = {Experimental Constraints on Exotic Spin-Dependent Interactions by a Magnetometer with Ensembles of Nitrogen-Vacancy Centers in Diamond},
author = {Hang Liang and Man Jiao and Yue Huang and Pei Yu and Xiangyu Ye and Ya Wang and Yijin Xie and Yi-Fu Cai and Xing Rong and Jiangfeng Du},
journal= {arXiv preprint arXiv:2201.04408},
year = {2022}
}