Far-infrared spectroscopy of nanoscopic InAs rings

TL;DR

This study uses time-dependent local-spin density theory to analyze the far-infrared spectra of nanoscopic InAs rings, confirming experimental observations and evaluating the theoretical approach's effectiveness for small nanostructures.

Contribution

It provides a theoretical analysis that confirms experimental spectral features of InAs nanorings and assesses the method's suitability for describing such nanostructures.

Findings

Good agreement between theory and experiment confirms spectral peak origins.

Theoretical method effectively describes small nanostructures.

Addition energies match capacitance spectra for one- and two-electron rings.

Abstract

We have employed time-dependent local-spin density theory to analyze the far-infrared transmission spectrum of InAs self-assembled nano-rings recently reported [A. Lorke et al, cond-mat/9908263 (1999)]. The overall agreement between theory and experiment is good, which on the one hand confirms that the experimental peaks indeed reflect the ring-like structure of the sample, and on the other hand, asseses the suitability of the theoretical method to describe such small nanostructures. The addition energies of one- and two-electron rings are also reported and compared with the corresponding capacitance spectra.