Abstract
From the degree of circular polarization of the time-resolved radiative recombination of 2D-electrons with photo-excited holes bound to acceptors we have measured the magnetic field dependence of the electron spin polarization for various fractional and Composite Fermions (CF) states. The Fermi energies of these CF states are measured for the first time and the corresponding value of the CF density of states mass at v = 1/2 is found to be about 4 times heavier than the previously reported values of the “activation” mass. We demonstrate that the Zeeman splitting of CFs is enhanced by a factor of 2.5due to the interaction between CFs. The latter is very sensitive to the finite width of the 2D-channel. The spin polarization at v = 1/3 and v = 2/3 displays an activated behavior and the derived spin-wave gaps are compared with simultaneously measured transport values.
The existence of the microwave (12–40 GHz) cyclotron resonance of Composite Fermions has been demonstrated in a 2D-electron system with an artificial density modulation using a sensitive optical detection scheme. This allows one to measure the cyclotron mass of Composite Fermions. This cyclotron mass increases from 0.68 m 0 to 1.21 m 0 when the electron density varies between 0.6 × 1011 cm−2 and 1.5 × 1011 cm−2.
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Kukushkin, I.V. (2002). Magneto-optics of Composite Fermions. In: Berthier, C., Lévy, L.P., Martinez, G. (eds) High Magnetic Fields. Lecture Notes in Physics, vol 595. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45649-X_3
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DOI: https://doi.org/10.1007/3-540-45649-X_3
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