Steady-State Solution for Dark States Using a Three-Level System in Coupled Quantum Dots

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.

Electromagnetically induced transparency of charge pumping in a triple-quantum-dots with Λ-type level structure

“…14 Through solving the steadystate solutions of the density matrix equations for a three-level double QD systems, one can obtain the condition for the appearance of a dark state. 15 The two-mode photon-assisted transport can then be examined in a three-level structure. 16,17 It was suggested recently that scalable quantum computation can be setup using the electrical population transfer in tunneling-coupled quantum wells 18 and in quantum dot systems 19 where electron transport is coherent.…”