Comment on ``Effective Mass and g-Factor of Four Flux Quanta Composite Fermions"

Details Comment on ``Effective Mass and g-Factor of Four Flux Quanta Composite Fermions" Comment on ``Effective Mass and g-Factor of Four Flux Quanta Composite Fermions"

1998-11-19

arxiv.org/abs/cond-mat/9811279v2

Phys. Rev. Lett. 83 (1999) 886

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

2 pages, RevTeX. Minor change

Scientific paper

10.1103/PhysRevLett.83.886

In a recent Letter, Yeh et al.[Phys. Rev. Lett. 82, 592 (1999)] have shown beautiful experimental results which indicate that the composite fermions with four flux quanta ($^4$CF) behave as fermions with mass and spin just like those with two flux quanta. They observed the collapse of the fractional quantum Hall gaps when the following condition is satisfied with some integer $j$, $g^*\mu_{\rm B}B_{\rm tot} = j \hbar \omega_{\rm c}^*$, where $g^*$ and $\omega_{\rm c}^*$ are the g-factor and the cyclotron frequency of the $^4$CF, respectively. However, in their picture the gap at the Fermi energy remains always finite even if the above condition is satisfied, thus the reason of the collapse was left as a mystery. In this comment it is shown that part of the mystery is resolved by considering the electron-hole symmetry properly.

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