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Magnetooptics of composite fermionsa Osipyan Institute of Solid State Physics, Russian Academy of Sciences, Akademika Osip'yana str. 2, Chernogolovka, Moscow Region, 142432, Russian Federation b Max-Planck Institut für Festkörperforschung, Stuttgart, Germany The Fermi energy and the Zeeman splitting of composite fermions are measured from the temperature dependence of the electron spin polarization at ν=1/2. We demonstrate that the Zeeman splitting of composite fermions is enhanced by a factor of 2.5 due to the interaction between CFs. The latter is very sensitive on the finite width of the 2D channel. The spin polarization at ν=1/3 and ν=2/3 displays an activated behavior and the derived spin-wave gaps are compared with simultaneously measured transport values.
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