Two-Particle Dark State in the Transport through a Triple Quantum Dot

TL;DR

This paper investigates the formation of a two-electron dark state in a triple quantum dot system, revealing how such states influence transport properties like conductance and shot noise.

Contribution

It introduces the concept of a two-electron dark state in a triple quantum dot and analyzes the conditions and signatures of its formation in transport measurements.

Findings

Identification of conditions for two-electron dark state formation

Distinct signatures in differential conductance

Impact on shot noise characteristics

Abstract

We study transport through a triple quantum dot in a triangular geometry with applied bias such that both singly- and doubly- charged states participate. We describe the formation of electronic dark states -- coherent superpositions that block current flow -- in the system, and focus on the formation of a two-electron dark state. We discuss the conditions under which such a state forms and describe the signatures that it leaves in transport properties such as the differential conductance and shotnoise.