(color online) The SdH oscillations in a single crystal. (a) The SdH oscillations amplitude as a function of 1/B at different temperatures after subtracting the smooth background. (b) The plot of LL index n versus 1/B. The intercept is −0.618 by taking the maximum and minimum of as the integer and half integer, respectively, indicating the Dirac phase. (c) The temperature dependence of of different LLs, giving the . (d) The Dingle plots giving the quantum lifetime of and Dingle temperature of 2.06 K.