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Magnetooptics of composite fermionsа Институт физики твердого тела имени Ю.А. Осипьяна РАН, ул. Академика Осипьяна 2, Черноголовка, Московская обл., 142432, Российская Федерация б 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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