Table 2. Band Gaps of Monolayer of VA Elements.

Element		N	P	As	Sb	Bi
Without SOC	Band gap/eV	3.70	1.97	1.59	1.26	0.55
	Gap type	Indirect	Indirect	Indirect	Indirect	Direct
	VBM	Not Γ	Not Γ	Γ	Γ	Γ
	CBM	Not Γ	Not Γ	Not Γ	Not Γ	Γ
With SOC	Band gap/eV	3.70	1.97	1.81	1.00	0.43
	Gap type	Indirect	Indirect	Indirect	Indirect	Indirect
	VBM	Not Γ	Not Γ	Γ	Γ	Not Γ
	CBM	Not Γ	Not Γ	Not Γ	Not Γ	Γ
Change of band gap due to SOC/eV		0.00	0.01	0.21	−0.26	−0.12