Vankov, A. B. and Kulik, L. V. and Kukushkin, I. V. and Kirpichev, V. E. and Dickmann, S. and Zhilin, V. M. and Smet, J. H. and Klitzing, Klaus von and Wegscheider, Werner
Low-Magnetic-Field Divergence of the Electronic g Factor Obtained from the Cyclotron Spin-Flip Mode of the ν=1 Quantum Hall Ferromagnet.
Physical Review Letters 97 (24), p. 246801.
We report an inelastic light scattering study of the cyclotron spin-flip mode in the two-dimensional electron system at filling ν=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.