Effective mass staircase and the Fermi liquid parameters for the fractional quantum Hall composite fermions

Details Effective mass staircase and the Fermi liquid parameters for the fractional quantum Hall composite fermions Effective mass staircase and the Fermi liquid parameters for the fractional quantum Hall composite fermions

2001-06-20

arxiv.org/abs/cond-mat/0106398v1

Phys. Rev. B 64, 235315 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, REVTeX

Scientific paper

10.1103/PhysRevB.64.235315

Effective mass of the composite fermion in the fractional quantum Hall system, which is of purely interaction originated, is shown, from a numerical study, to exhibit a curious nonmonotonic behavior with a staircase correlated with the number (=2,4,...) of attached flux quanta. This is surprising since the usual composite-fermion picture predicts a smooth behavior. On top of that, significant interactions are shown to exist between composite fermions, where the excitation spectrum is accurately reproduced in terms of Landau's Fermi liquid picture with negative (i.e., Hund's type) orbital and spin exchange interactions.

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