Low-magnetic-field divergence of the electronic g factor obtained from the cyclotron spin-flip mode of the nu=1 quantum Hall ferromagnet |
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Authors: | Van'kov A B Kulik L V Kukushkin I V Kirpichev V E Dickmann S Zhilin V M Smet J H von Klitzing K Wegscheider W |
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Affiliation: | Institute for Solid State Physics, Russian Academy of Sciences, Chernogolovka 142432, Russia. |
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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. |
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