Controlled energy-selected electron capture and release in double quantum dots

TL;DR

This paper demonstrates that energy transfer and electron capture in double quantum dots can be precisely controlled through long-range electron correlation, enabling efficient energy transfer and electron removal with narrow energy distribution.

Contribution

It introduces a method to control energy transfer in double quantum dots using resonance states, enhancing efficiency and selectivity compared to natural atomic systems.

Findings

Energy transfer is efficient at large inter-dot distances.

Preparation of resonance states enhances process efficiency.

Electron removal energy distribution is narrowly confined.

Abstract

Highly accurate quantum electron dynamics calculations demonstrate that energy can be efficiently transferred between quantum dots. Specifically, in a double quantum dot an incoming electron is captured by one dot and the excess energy is transferred to the neighboring dot and used to remove an electron from this dot. This process is due to long-range electron correlation and shown to be operative at rather large distances between the dots. The efficiency of the process is greatly enhanced by preparing the double quantum dot such that the incoming electron is initially captured by a two-electron resonance state of the system. In contrast to atoms and molecules in nature, double quantum dots can be manipulated to achieve this enhancement. This mechanism leads to a surprisingly narrow distribution of the energy of the electron removed in the process which is explained by resonance theory. We argue that the process could be exploited in practice.