The dynamical axion quasiparticle, which is directly analogous to the hypothetical fundamental axion particle, is observed in two-dimensional MnBi2Te4, and has implications for quantum chromodynamics, cosmology and string theory.
The dynamical axion quasiparticle, which is directly analogous to the hypothetical fundamental axion particle, is observed in two-dimensional MnBi2Te4, and has implications for quantum chromodynamics, cosmology and string theory.