Coulomb-interaction induced incomplete shell filling in the hole system of InAs quantum dots

TL;DR

This study investigates how Coulomb interactions cause incomplete shell filling in InAs quantum dots, revealing that the p-shell is only half filled due to strong electron-electron interactions, affecting the quantum dot's ground state.

Contribution

It demonstrates the significant role of Coulomb interactions in incomplete shell filling in InAs quantum dots, providing new insights into their electronic structure.

Findings

The s-like ground state is fully filled with two holes.

The p-shell is only half filled with two holes.

The six-hole ground state is highly polarized.

Abstract

We have studied the hole charging spectra of self-assembled InAs quantum dots in perpendicular magnetic fields by capacitance-voltage spectroscopy. From the magnetic field dependence of the individual peaks we conclude that the s-like ground state is completely filled with two holes but that the fourfold degenerate p-shell is only half filled with two holes before the filling of the d-shell starts. The resulting six-hole ground state is highly polarized. This incomplete shell filling can be explained by the large influence of the Coulomb interaction in this system.