2008/02/19 by Biao Wu, Qi Zhang, Jie Liu · 1 citation
Physics and Astronomy · #cond-mat.other
paper · pdf · doi:10.1016/j.physleta.2010.12.030
published as Phys. Lett. A375:545, 2011 · 4 pages, 3 figures
arxiv created 2008/02/19 · arxiv updated 2015/05/12
Anomalous monopole of disk shape is found to exist in the semiclassical theory of a two-mode interacting boson system. The quantum origin of this anomaly is the collapsing or bundling of field lines of Berry curvature caused by the interaction between bosons in the semiclassical limit. The significance of this anomalous monopole is twofold: (1) it signals the failure of the von Neumann-Wigner theorem in the semiclassical limit; (2) it indicates a breakdown of the correspondence principle between quantum and classical dynamics.