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A synthetic monopole source of Kalb-Ramond field in diamond.

Mo ChenChanghao LiGiandomenico PalumboYan-Qing ZhuNathan GoldmanPaola Cappellaro
Published in: Science (New York, N.Y.) (2022)
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 tensor monopole by measuring its quantized topological charge and its emanating Kalb-Ramond field. By introducing a fictitious external field that breaks chiral symmetry, we further observed an intriguing spectral transition, characterized by spectral rings protected by mirror symmetries. Our work demonstrates the possibility of emulating exotic topological structures inspired by string theory.
Keyphrases
  • solid state
  • optical coherence tomography
  • ultrasound guided
  • computed tomography
  • magnetic resonance imaging
  • magnetic resonance
  • room temperature
  • density functional theory
  • ionic liquid