Measurements of the Composite Fermion masses from the spin polarization of 2-D electrons in the region $1<ν<2$

Details Measurements of the Composite Fermion masses from the spin polarization of 2-D electrons in the region $1<ν<2$ Measurements of the Composite Fermion masses from the spin polarization of 2-D electrons in the region $1<ν<2$

2001-11-26

arxiv.org/abs/cond-mat/0111492v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figs

Scientific paper

10.1103/PhysRevB.65.161305

Measurements of the reflectivity of a 2-D electron gas are used to deduce the polarization of the Composite Fermion hole system formed for Landau level occupancies in the regime 1<\nu<2. The measurements are consistent with the formation of a mixed spin CF system and allow the density of states or `polarization' effective mass of the CF holes to be determined. The mass values at \nu=3/2 are found to be ~1.9m_{e} for electron densities of 4.4 x 10^{11} cm^{-2}, which is significantly larger than those found from measurements of the energy gaps at finite values of effective magnetic field.

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