title: Low-magnetic-field divergence of the electronic g factor obtained from the cyclotron spin-flip mode of the nu=1 quantum Hall ferromagnet.
abstract: We report an inelastic light scattering study of the cyclotron spin-flip mode in the two-dimensional electron system at filling nu=1. The energy of this mode can serve as a probe of the many-body exchange interaction on short length scales. Its magnetic field dependence is compared with predictions based on Hartree-Fock theory. They agree well when including the nonzero width of the electron system. From the measured energies, the exchange enhanced g factor is extracted. It diverges at small fields and differs largely from g factors obtained via transport activation studies.
authors.affiliation: Institute for Solid State Physics, Russian Academy of Sciences, Chernogolovka 142432, Russia.
authors.forename: A B
authors.initials: AB
authors.lastname: Van'kov
authors.forename: L V
authors.initials: LV
authors.lastname: Kulik
authors.forename: I V
authors.initials: IV
authors.lastname: Kukushkin
authors.forename: V E
authors.initials: VE
authors.lastname: Kirpichev
authors.forename: S
authors.initials: S
authors.lastname: Dickmann
authors.forename: V M
authors.initials: VM
authors.lastname: Zhilin
authors.forename: J H
authors.initials: JH
authors.lastname: Smet
authors.forename: K
authors.initials: K
authors.lastname: von Klitzing
authors.forename: W
authors.initials: W
authors.lastname: Wegscheider