title: NMR evidence for spin canting in a bilayer nu=2 quantum hall system.
abstract: We investigate the electron spin states in the bilayer quantum Hall system at total Landau level filling factor nu=2 exploiting current-pumped and resistively detected NMR. The measured Knight shift, K(S), of 75As nuclei reveals continuous variation of the out-of-plane electronic spin polarization between nearly full and zero as a function of density imbalance. Nuclear spin relaxation measurements indicate a concurrent development of an in-plane spin component. These results provide direct information on the spin configuration in this system and comprise strong evidence for the spin canting suggested by previous experiments.
authors.affiliation: NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Kumada
authors.forename: K
authors.initials: K
authors.lastname: Muraki
authors.forename: Y
authors.initials: Y
authors.lastname: Hirayama