Comments on ``Evidence of Landau Levels and Interactions in Low-Lying Excitations of Composite Fermions ..." by Dujovne, Pinczuk, Kang, Dennis, Pfeiffer and West, cond-mat/0211022

TL;DR

This paper critiques a previous interpretation of composite fermion spectra, arguing that the CF model is spin-independent and that earlier conclusions about interactions and effective fields are incorrect, based on a fundamental theoretical inconsistency.

Contribution

It provides a theoretical refutation of the spin-dependent interpretation of composite fermion spectra, emphasizing the spin independence of the CF model.

Findings

The CF effective field formula is incorrect.

The CF model is independent of spin.

Experimental quasiparticle mass is much smaller than CF mass.

Abstract

Dujavne et al suggest that the observed spectra are a result of spin-split Landau levels and spin-flip energies reveal composite fermion interactions. We find that the CF effective field formula is incorrect. In fact, CF model is independent of spin so that the interpretations of data by Dujovne et al in terms of CF model are incorrect. It may be pointed out that the experimental mass of the quasiparticles is several orders of magnitude smaller than the CF mass.