A synthetic monopole source of Kalb-Ramond field in diamond

@article{Chen2022ASM,
  title={A synthetic monopole source of Kalb-Ramond field in diamond},
  author={Mo Chen and Changhao Li and Giandomenico Palumbo and Yan-Qing Zhu and Nathan Goldman and Paola Cappellaro},
  journal={Science},
  year={2022},
  volume={375},
  pages={1017 - 1020}
}
Magnetic monopoles play a central role in areas of physics that range from electromagnetism to topological matter. String theory promotes conventional vector gauge fields of electrodynamics to tensor gauge fields and predicts the existence of more exotic tensor monopoles. Here, we report the synthesis of a tensor monopole in a four-dimensional parameter space defined by the spin degrees of freedom of a single solid-state defect in diamond. Using two complementary methods, we characterized the… 
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