Anomalous Monopole In an Interacting Boson System

TL;DR

This paper discovers an anomalous monopole in a two-mode interacting boson system, revealing quantum effects that challenge classical and semiclassical theories, with implications for fundamental physics principles.

Contribution

It introduces the existence of an anomalous monopole in a boson system and explains its quantum origin and significance in semiclassical theory.

Findings

Existence of a disk-shaped anomalous monopole in the system

Quantum origin linked to Berry curvature line collapsing

Challenges to the von Neumann-Wigner theorem and correspondence principle

Abstract

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.