TY - JOUR
T1 - NMR study of a canted antiferromagnet in a bilayer quantum Hall system
AU - Kumada, Norio
AU - Muraki, Koji
AU - Hirayama, Yoshiro
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/3
Y1 - 2008/3
N2 - 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.
AB - 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.
KW - Bilayer quantum Hall system
KW - Canted antiferromagnetic state
KW - Goldstone mode
KW - NMR
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U2 - 10.1016/j.physe.2007.08.063
DO - 10.1016/j.physe.2007.08.063
M3 - Article
AN - SCOPUS:39649121038
VL - 40
SP - 937
EP - 941
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
SN - 1386-9477
IS - 5
ER -