Symmetry dependent electron localization and optical absorption of polygonal quantum rings

TL;DR

This paper investigates how the shape of polygonal quantum rings influences their electronic and optical properties, revealing geometry-dependent localization and tunable optical transitions.

Contribution

It demonstrates the impact of sample geometry on electron localization and optical absorption, and shows how contacts can switch behavior between square and diamond shapes.

Findings

Diamond rings have delocalized low energy states between opposite corners.

Sample geometry significantly affects optical transition patterns.

Contacts enable continuous tuning between different geometrical behaviors.

Abstract

We compare energy spectra, electron localization and optical absorption of square and diamond quantum rings and analyze how sample geometry affects those features. We show that low energy levels of diamond rings form two groups delocalized between opposite corners which results in increased number of optical transitions. We also show that contacts applied to corner areas allow for continuous change between square- and diamond-like behavior of the same sample, irrespective of its shape.