Spin Polarization Phenomena and Pseudospin Quantum Hall Ferromagnetism in the HgTe Quantum Well

TL;DR

This paper investigates spin polarization phenomena and pseudospin quantum Hall ferromagnetism in HgTe quantum wells, revealing how spin polarization and magnetic level anticrossings depend on magnetic fields through magnetoresistance measurements.

Contribution

It provides new experimental insights into spin polarization and quantum Hall ferromagnetism in HgTe quantum wells using multiple measurement methods.

Findings

Full spin polarization achieved in zero and quasi-classical fields

Magnetic level anticrossings depend nonmonotonously on Bper

Spin polarization observed through magnetoresistance measurements

Abstract

The parallel field of a full spin polarization of the electron gas in a \Gamma8 conduction band of the HgTe quantum well was obtained from the magnetoresistance by three different ways in a zero and quasi-classical range of perpendicular field component Bper. In the quantum Hall range of Bper the spin polarization manifests in anticrossings of magnetic levels, which were found to strongly nonmonotonously depend on Bper.