Quantum Hall effects at Landau level crossings

Yoshiro Hirayama, Koji Muraki, Katsushi Hashimoto, Kei Takashina, Tadashi Saku

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)

Abstract

Interesting ferromagnetic characteristics are found in quantum Hall effects when Landau levels (LLs) cross and carrier interaction effects become important at the crossing points. Such LL crossings are studied in bilayer AlGaAs/GaAs systems and silicon quantum wells having a novel valley splitting. Detailed measurements of bilayer ferromagnetism at the LL crossings reveal easy-plane or axis characteristics depending on spin and pseudospin of the crossing states. In the fractional QH regime, interactions between electron and nuclear spins are observed at the crossings of composite-fermion LLs.

Original languageEnglish
Pages (from-to)133-142
Number of pages10
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume20
Issue number1-2
DOIs
Publication statusPublished - 2003 Dec 1
Externally publishedYes
EventProceedings of the International Symposium at Quantum Hall Effect - Stuttgart, Germany
Duration: 2003 Jul 22003 Jul 5

Keywords

  • Composite fermion
  • Electron spin
  • Landau level
  • Nuclear spin
  • Quantum Hall effect

ASJC Scopus subject areas

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

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