# Density oscillation in highly flattened quantum elliptic rings and tunable strong dipole radiation

## TL;DR

This paper investigates how magnetic fields influence electron behavior in highly flattened elliptic quantum rings, revealing tunable dipole radiation and a novel Aharonov-Bohm oscillation caused by symmetry breaking.

## Contribution

It introduces a new type of Aharonov-Bohm oscillation linked to shape-induced symmetry breaking in elliptic quantum rings and explores tunable strong dipole emission.

## Key findings

- Strong dipole photon emission can be achieved and tuned by magnetic field and shape.
- Electron density oscillates between patterns with changing magnetic field.
- A new symmetry-breaking Aharonov-Bohm oscillation is identified.

## Abstract

A narrow elliptic ring containing an electron threaded by a magnetic field B is studied. When the ring is highly flattened, the increase of B would lead to a big energy gap between the ground and excited states, and therefore lead to a strong emission of dipole photons. The photon frequency can be tuned in a wide range by changing B and/or the shape of the ellipse. The particle density is found to oscillate from a pattern of distribution to another pattern back and forth against $B$. This is a new kind of Aharonov-Bohm oscillation originating from symmetry breaking and is different from the usual oscillation of persistent current.