(color online) The surface local density of states (LDOS) with l = 5, corresponding to the points A (a) and C (b) in Fig. 1(a). (a) The trivial insulator state, where there is no edge state in the gap. (b) The QAH state, where one edge state exists in the gap. The parameters used in panels (a) and (b) are the same as those in Figs. 1(b) and 1(d), respectively.