Observation of half-integer quantum Hall effect in single-layer graphene   using pulse magnet
  We report magnetotransport measurements on a single-layer graphene in pulsed magnetic fields up to $B$ = 53 T. With either electron- or hole-type charge carriers, the Hall resistance $R_{H}$ is quantized into $R_{H}$ = $(h/e^2)\nu ^{-1}$ with $\nu$ = $\pm$2, $\pm$6, and $\pm$10, which demonstrates the observation of half-integer quantum Hall effect (QHE). At $B$ = 50 T, the half-integer QHE is even observed at room temperature in spite of a conventional carrier mobility $\mu$ = 4000 cm$^2$/Vs. 
Satoru Masubuchi, Ken-ichi Suga, Masashi Ono, Koichi Kindo, Shojiro   Takeyama, and Tomoki Machida