  A recent experimental study [Pan et al., arXiv: 1902.10262] has shown that
fractional quantum Hall effect gaps are essentially consistent with
particle-hole symmetry in the lowest Landau level. Motivated by this result, we
consider a clean two dimensional electron system (2DES) from the viewpoint of
composite fermion mean-field theory. In this short note, we show that while the
experiment is manifestly consistent with a Dirac composite fermion theory
proposed recently by Son, it can equally well be explained within the framework
of non-relativistic composite fermions, first put forward by Halperin, Lee, and
Read.
