Spin Reversal of a Quantum Hall Ferromagnet at a Landau Level Crossing
OPEN ACCESS
Loading...
Author / Producer
Date
2020-08-07
Publication Type
Journal Article
ETH Bibliography
yes
Citations
Altmetric
OPEN ACCESS
Data
Rights / License
Abstract
When Landau levels (LLs) become degenerate near the Fermi energy in the quantum Hall regime, interaction effects can drastically modify the electronic ground state. We study the quantum Hall ferromagnet formed in a two-dimensional hole gas around the LL filling factor ν = 1 in the vicinity of a LL crossing in the heave-hole valence band. Cavity spectroscopy in the strong-coupling regime allows us to optically extract the spin polarization of the two-dimensional hole gas. By analyzing this polarization as a function of hole density and magnetic field, we observe a spin flip of the ferromagnet. Furthermore, the depolarization away from v=1 accelerates close to the LL crossing. This is indicative of an increase in the size of skyrmion excitations as the effective Zeeman energy vanishes at the LL crossing.
Permanent link
Publication status
published
Editor
Book title
Journal / series
Volume
125 (6)
Pages / Article No.
67404
Publisher
American Physical Society
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Organisational unit
03636 - Imamoglu, Atac / Imamoglu, Atac
03833 - Wegscheider, Werner / Wegscheider, Werner
Notes
Grant: NCCR QSIT
Funding
Related publications and datasets
Is supplemented by: