Activation studies of pseudospin quantum Hall ferromagnets in double quantum wells

Koji Muraki, Tadashi Saku, Yoshiro Hirayama

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)

Abstract

We study pseudospin quantum Hall ferromagnets realized in a strongly coupled double-quantum-well structure. The pseudospin dependence of the Coulomb interactions leads to magnetic anisotropy. Activation energies measured as a function of the single-particle gap, i.e. the pseudospin Zeeman energy, reveal a striking difference between the easy-axis and easy-plane ferromagnets. In the limit of zero single-particle gap, we observe a novel low-energy excitation, reminiscent of Skyrmions, for the ν = 4 easy-axis ferromagnet. We discuss the reduced gap in terms of topological charge excitations in the domain walls.

Original languageEnglish
Pages (from-to)8-11
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume12
Issue number1-4
DOIs
Publication statusPublished - 2002 Jan
Externally publishedYes
Event14th International Conference on the - Prague, Czech Republic
Duration: 2001 Jul 302001 Aug 3

Keywords

  • Bilayer electron system
  • Domain wall
  • Ising spin
  • Quantum Hall effect
  • Quantum Hall ferromagnet
  • Skyrmion

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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