NMR study of a canted antiferromagnet in a bilayer quantum Hall system

Norio Kumada, Koji Muraki, Yoshiro Hirayama

研究成果: Article査読

抄録

We investigate static and dynamic properties of electron spins in the bilayer quantum Hall system at total Landau level filling factor ν = 2 by using current-pumped and resistively detected nuclear magnetic resonance (NMR). The measured Knight shift, KS, of 75As nuclei reveals continuous variation of the out-of-plane electronic spin polarization Pz between nearly full and zero as a function of density imbalance between the two layers. Nuclear spin relaxation rate 1 / T1 indicates that the in-plane spin order accompanied by a gapless low-frequency mode (i.e., the Goldstone mode) develops when Pz varies. These results provide direct information on the spin configuration and the low-energy collective excitations in the canted antiferromagnetic state.

本文言語English
ページ(範囲)937-941
ページ数5
ジャーナルPhysica E: Low-Dimensional Systems and Nanostructures
40
5
DOI
出版ステータスPublished - 2008 3月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 原子分子物理学および光学
  • 凝縮系物理学

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