Observation of the Axion quasiparticle in 2D MnBi${}_2$Te${}_4$

Jian-Xiang Qiu, Barun Ghosh, Jan Schütte-Engel +32

In 1978, Wilczek and Weinberg theoretically discovered a new boson-the Axion-which is the coherent oscillation of the $\theta$ field in QCD. Its existence can solve multiple fundamental…