On the Collective Mode Spectrum for Composite Fermions at 1/3 Filling Factor

Details On the Collective Mode Spectrum for Composite Fermions at 1/3 Filling Factor On the Collective Mode Spectrum for Composite Fermions at 1/3 Filling Factor

1996-06-30

arxiv.org/abs/cond-mat/9606222v1

Physics

Condensed Matter

17 pages, one figure. Submitted to Int. Jour. Mod. Phys. B

Scientific paper

The collective mode spectrum of the composite fermion state 1/3 filling factor is evaluated. At zero momentum, the result coincides with the cyclotron energy at the external magnetic field value, and not at the effective magnetic field, in spite of the fact that only the former enters in the equations, thus, the Kohn theorem is satisfied. Unexpectedly, in place of a magneto roton minimum, the collective mode gets a treshold indicating the instability of the mean field composite fermion state under the formation of crystalline structures. However, the question about if if this outcome only appears within the mean field approximation should be further considered.

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