Magnetic field dependence of hole levels in self-assembled InAs quantum dots

TL;DR

This paper investigates how magnetic fields influence hole energy levels in self-assembled InAs quantum dots using advanced modeling, revealing the significant role of heavy hole-light hole interactions without requiring incomplete shell filling assumptions.

Contribution

It introduces a multi-band kp Hamiltonian approach that explicitly considers heavy hole-light hole interactions, providing a new explanation for experimental observations without incomplete shell filling.

Findings

Heavy hole-light hole interaction significantly affects magnetic field dependence.

Coulomb interactions alone do not cause incomplete hole shell filling.

The model aligns well with recent magneto-transport experiments.

Abstract

Recent magneto-transport experiments of holes in InGaAs quantum dots [D. Reuter, P. Kailuweit, A.D. Wieck, U. Zeitler, O. Wibbelhoff, C. Meier, A. Lorke, and J.C. Maan, Phys. Rev. Lett. 94, 026808 (2005)] are interpreted by employing a multi-band kp Hamiltonian, which considers the interaction between heavy hole and light hole subbands explicitely. No need of invoking an incomplete energy shell filling is required within this model. The crucial role we ascribe to the heavy hole-light hole interaction is further supported by one-band local-spin-density functional calculations, which show that Coulomb interactions do not induce any incomplete hole shell filling and therefore cannot account for the experimental magnetic field dispersion.