On the response of composite fermions to weak electrostatic potentials

Details On the response of composite fermions to weak electrostatic potentials On the response of composite fermions to weak electrostatic potentials

1999-12-09

arxiv.org/abs/cond-mat/9912156v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 postscript figures included

Scientific paper

We establish that the response to static perturbations of two-dimensional electron systems (2DESs), exposed to magnetic field B, in states with the Landau-level filling fractions \nu close to one such as 1/2, is singularly different from that of 2DESs at small |B|. Thus in addition to demonstrating the sever inadequacy of the treatment of composite fermions as non-interacting particles, we show, in contradiction to a recent theoretical finding, that the physical origin of the observed behaviour of the dc longitudinal magneto-resistivity for \nu close to 1/2 in periodically modulated 2DESs remains to be determined.

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