Collision and capture dynamics in a quantum dot: The role of doubly excited states

TL;DR

This paper studies how doubly excited states affect collision outcomes in a quantum dot system, revealing increased reflection and trapping probabilities due to these states.

Contribution

It provides a detailed analysis of collision dynamics in quantum dots, highlighting the significant role of doubly excited states in electron trapping and reflection.

Findings

Reflection probability increases near doubly excited states

Doubly excited states enhance electron trapping within the dot

Collision dynamics are strongly influenced by these states

Abstract

We investigate collision dynamics involving two electrons and a quantum dot embedded in a quantum wire. One electron is initially at rest in the ground state of the dot, whereas the other electron is incident on the dot with a rather well defined velocity. Excitation, reflection and transmission probabilities are obtained by resolving the dynamics explicitly. Also, the probability of both electrons being unbound after collision is studied. It is found that the dynamics is strongly influenced by the presence of doubly excited states; reflection becomes considerably more probable in the energetic vicinity of such states. This, in turn, contributes to an increase in the probability of trapping also the second electron within the dot.