Dirac states from px,y orbitals in the buckled honeycomb structures: A tight-binding model and first-principles combined study<xref rid="cpb_27_8_087101fn1" ref-type="fn">*</xref><fn id="cpb_27_8_087101fn1"><label>*</label>Project supported by the National Key Research and Development Projects of China (Grant No. 2016YFA0202300), the National Natural Science Foundation of China (Grant No. 61390501), the Science Fund from the Chinese Academy of Sciences (Grant No. XDPB0601), and the US Army Research Office.</fn>

Dirac states from p_x,y orbitals in the buckled honeycomb structures: A tight-binding model and first-principles combined study**

Project supported by the National Key Research and Development Projects of China (Grant No. 2016YFA0202300), the National Natural Science Foundation of China (Grant No. 61390501), the Science Fund from the Chinese Academy of Sciences (Grant No. XDPB0601), and the US Army Research Office.

Song Shi-Ru^{1, 2}, Yang Ji-Hui^{3, †}, Du Shi-Xuan^{1, 2, ‡}, Gao Hong-Jun^{1, 2}, Yakobson Boris I³

(color online) Band structures of p_x,y-orbital Dirac states for the unbuckled case with different choices of hopping integrals of V_ppπ and V_ppσ: (a) V_ppπ = 0.33 eV and V_ppσ = −0.97 eV; (b) V_ppπ = 1.30 eV and V_ppσ = 0.00 eV; (c) V_ppπ = 0.00 eV and V_ppσ = −1.30 eV. Note that, the flat bands appear when V_ppπ = 0 or V_ppσ = 0.