Steady-state solution for dark states using a three-level system in coupled quantum dots

TL;DR

This paper theoretically analyzes the steady-state conditions for dark states in a three-level coupled quantum dot system, revealing how coherence leads to dark states and demonstrating their emergence through numerical current simulations.

Contribution

It provides the first detailed steady-state analytical solution for dark states in a three-level quantum dot system and explores the conditions for their appearance.

Findings

Dark states occur due to coherence between electromagnetic fields and energy levels.

Steady-state solutions reveal specific conditions for dark state formation.

Numerical simulations confirm the presence of dark states in current characteristics.

Abstract

Quantum dots (QDs) are one of the promising candidates of interconnection between electromagnetic field and electrons in solid-state devices. Dark states appear as a result of coherence between the electromagnetic fields and the discrete energy levels of the system. Here, we theoretically solve the steady-state solutions of the density matrix equations for a thee-level double QD system and investigate the condition of the appearance of a dark state. We also numerically show the appearance of the dark state by time-dependent current characteristics.