Ajit C. Balram, Arkadiusz Wójs, Jainendra K. Jain
Exact diagonalization studies demonstrate that the model of nearly free composite fermions does not adequately capture the physics of the excitations of the fractional quantum Hall state. We show that the excitations can be understood by imposing an additional strong hard-core interaction that eliminates certain excitons. This, however, does not cause a significant correction, at low temperatures, to the thermodynamics of the fractional quantum Hall effect and the composite-fermion Fermi sea, thus providing a microscopic explanation for why the model of nearly free composite fermions has proved successful in the analysis of experimental observations.
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http://arxiv.org/abs/1307.1291
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