Figure 1

(a) The top view of phosphorene, a = 2.22 Å (θ = 96.79°) is the in plane bond length (angel), a₁ (3.32 Å) and a₂ (4.38 Å) the primitive vectors, t_i (i = 1, 2, 3, 4, 5) the five hopping links for TB model. (b) The side view of phosphorene. (c) The first Brillouin zone of phosphorene. (d) The energy dispersions of phosphorene, the black solid and red dashed lines, represent the results obtained from the TB and low energy k·p models, respectively. The blue dash-dotted lines represent the results obtained from the decoupled Hamiltonian (12) and the green solid line illustrates the energy regime where three Hamiltonians agree well with each other.