Low-magnetic-field divergence of the electronic g factor obtained from the cyclotron spin-flip mode of the nu=1 quantum Hall ferromagnet

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...

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Bibliographic Details
Published in:Physical review letters 2006-12, Vol.97 (24), p.246801-246801, Article 246801
Main 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
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.97.246801