Quantum Hall ferromagnet at high filling factors: A magnetic-field-induced Stoner transition

B. A. Piot, D. K. Maude, M. Henini, Z. R. Wasilewski, K. J. Friedland, R. Hey, K. H. Ploog, A. I. Toropov, R. Airey, and G. Hill
Phys. Rev. B 72, 245325 – Published 20 December 2005

Abstract

Spin splitting in the integer quantum Hall effect is investigated for a series of AlxGa1xAsGaAs heterojunctions and quantum wells. Magnetoresistance measurements are performed at mK temperature to characterize the electronic density of states and estimate the strength of many body interactions. A simple model with no free parameters correctly predicts the magnetic field required to observe spin splitting, confirming that the appearance of spin splitting, is a result of a competition between the disorder induced energy cost of flipping spins and the exchange energy gain associated with the polarized state. In this model, the single particle Zeeman energy plays no role, so that the appearance of this quantum Hall ferromagnet in the highest occupied Landau level can also be thought of as a magnetic field induced Stoner transition.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
3 More
  • Received 13 September 2005

DOI:https://doi.org/10.1103/PhysRevB.72.245325

©2005 American Physical Society

Authors & Affiliations

B. A. Piot and D. K. Maude

  • Grenoble High Magnetic Field Laboratory, Centre National de la Recherche Scientifique, Boite Postale 166, F-38042 Grenoble Cedex 9, France

M. Henini

  • School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom

Z. R. Wasilewski

  • Institute for Microstructural Sciences, National Research Council, Ottawa, Canada K1A 0R6

K. J. Friedland, R. Hey, and K. H. Ploog

  • Paul Drude Institut für Festkörperelektronik, Hausvogteiplatz 5-7, D-10117 Berlin, Germany

A. I. Toropov

  • Institute of Semiconductor Physics, Prosp. Lavrentyeva 13, 630090 Novosibirsk, Russia

R. Airey and G. Hill

  • Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 4DU, United Kingdom

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 72, Iss. 24 — 15 December 2005

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×