Analytical Current Formula for Strongly Coupled Quantum Dot with Arbitrary Electron-Electron Interaction

TL;DR

This paper derives an analytical formula for current through a quantum dot with arbitrary electron-electron interaction strength, incorporating many-body correlations to match experimental observations.

Contribution

It introduces a diagrammatic method that accounts for strong coupling and electron correlations beyond mean-field theory in quantum dot transport.

Findings

Analytical current formula valid for any interaction strength

Inclusion of many-body effects improves agreement with experiments

Method extends understanding of strongly correlated quantum dot systems

Abstract

An analytical expression for the current through a single level quantum dot for arbitrary strength of the on-site electron-electron interaction is derived beyond standard mean-field theory. By describing the localised states in terms of many-body operators, the employed diagrammatic technique for strong coupling enables inclusion of electron correlation effects into the description of the local dynamics, which provides transport properties that are consistent with recent experimental data.