Mapping the Chemical Potential Landscape of a Triple Quantum Dot

TL;DR

This paper explores the charge dynamics and tunnelling pathways in a triple quantum dot system, mapping these to chemical potentials and validating the model with experimental data.

Contribution

It introduces a real-time charge sensing method to map tunnelling pathways and uses a modified Hubbard Hamiltonian to accurately describe the system.

Findings

Identified non-trivial tunnelling paths in the quantum dot system.

Mapped charge states to chemical potentials across the system.

Validated the theoretical model with experimental results.

Abstract

We investigate the non-equilibrium charge dynamics of a triple quantum dot and demonstrate how electron transport through these systems can give rise to non-trivial tunnelling paths. Using a real-time charge sensing method we establish tunnelling pathways taken by particular electrons under well-defined electrostatic configurations. We show how these measurements map to the chemical potentials for different charge states across the system. We use a modified Hubbard Hamiltonian to describe the system dynamics and show that it reproduces all experimental observations.