Correlated few-particle states in artificial bipolar molecule

TL;DR

This paper explores the complex behavior of electron-hole pairs in a coupled quantum dot system, revealing how their ground states and energy levels change with coupling strength using exact diagonalization.

Contribution

It introduces a detailed analysis of correlated few-particle states in an artificial bipolar molecule with novel insights into angular momentum switching.

Findings

Ground-state angular momentum exhibits switching behavior.

Rearrangement of single-particle energy levels occurs with varying coupling.

Exact diagonalization effectively captures the system's complex states.

Abstract

We investigate the ground and excited states of a bipolar artificial molecule composed of two vertically coupled quantum dots containing different type of carriers -- electrons and holes -- in equilibrium. The approach based on exact diagonalization is used and reveals an intricate pattern of ground-state angular momentum switching and a rearrangement of approximate single-particle levels as a function of the inter-dot coupling strength.