Magnetically induced chessboard pattern in the conductance of a Kondo quantum dot

TL;DR

This paper models and explains the magnetically induced conductance pattern in a Kondo quantum dot using a double quantum dot framework and spin density functional calculations, aligning well with experimental data.

Contribution

It introduces a comprehensive model combining a double quantum dot analogy with 3D spin density functional calculations to explain the chessboard conductance pattern.

Findings

The chessboard pattern persists at very low magnetic fields.

The model accurately reproduces experimental conductance modulations.

Effective Kondo coupling parameter enables quantitative predictions.

Abstract

We quantitatively describe the main features of the magnetically induced conductance modulation of a Kondo quantum dot -- or chessboard pattern -- in terms of a constant-interaction double quantum dot model. We show that the analogy with a double dot holds down to remarkably low magnetic fields. The analysis is extended by full 3D spin density functional calculations. Introducing an effective Kondo coupling parameter, the chessboard pattern is self-consistently computed as a function of magnetic field and electron number, which enables us to quantitatively explain our experimental data.