Magneto-capacitance probing of the many-particle states in InAs dots

TL;DR

This paper employs frequency-dependent capacitance-voltage spectroscopy with magnetic fields to investigate the quantum states of electrons in InAs quantum dots, revealing wave function characteristics and effects of confinement and correlations.

Contribution

It introduces a method to probe many-particle states in quantum dots using magneto-capacitance spectroscopy, providing detailed insights into wave functions and electron interactions.

Findings

Wave functions for 1-2 electrons match harmonic oscillator models.

High energy orbitals show anisotropic confinement signatures.

Correlation effects influence the electronic states in InAs dots.

Abstract

We use frequency-dependent capacitance-voltage spectroscopy to measure the tunneling probability into self-assembled InAs quantum dots. Using an in-plane magnetic field of variable strength and orientation, we are able to obtain information on the quasi-particle wave functions in momentum space for 1 to 6 electrons per dot. For the lowest two energy states, we find a good agreement with Gaussian functions for a harmonic potential. The high energy orbitals exhibit signatures of anisotropic confinement and correlation effects.