Vanishing Zeeman energy in a two-dimensional hole gas

Journal article (2020)

Authors

P. Del Vecchio Polytechnique Montreal
M. Lodari QuTech Advanced Research Centre, QCD/Scappucci Lab - QuTech Advanced Research Centre , Kavli institute of nanoscience Delft
A. Sammak TNO, Business Development
G. Scappucci QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, QCD/Scappucci Lab - QuTech Advanced Research Centre
Oussama Moutanabbir Polytechnique Montreal
Research Group
QCD/Scappucci Lab (QuTech Advanced Research Centre) (TU Delft)
Copyright: © 2020 P. Del Vecchio, M. Lodari, A. Sammak, G. Scappucci, O. Moutanabbir
DOI: https://doi.org/10.1103/PhysRevB.102.115304
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Published Date

2020

Language

English

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Faculty

QuTech Advanced Research Centre

Department

Quantum Computing Division

Research Group

QCD/Scappucci Lab

Abstract

A clear signature of Zeeman split states crossing is observed in a Landau fan diagram of strained germanium two-dimensional hole gas. The underlying mechanisms are discussed based on a perturbative model yielding a closed formula for the critical magnetic fields. These fields depend strongly on the energy difference between the topmost and neighboring valence bands and are sensitive to the quantum well thickness, strain, and spin-orbit interaction. The latter is a necessary feature for the crossing to occur. This framework enables a straightforward quantification of the hole-state parameters from simple measurements, thus paving the way for its use in design and modeling of hole-based quantum devices.