Table 2.

The bandgaps and carrier effective mass of monolayer β-CSe and β-P. Indirect bandgap is marked as In in parenthesis.

Material	PBE Gap (type) eV	HSE Gap (type) eV	m*h/me Zigzag Direction	m*h/me Armchair Direction	m*e/me Zigzag Direction	m*e/me Armchair Direction
β-CSe	1.54 (In)	2.37 (In)	0.718	0.795	0.23	1.027
β-P	1.94 (In)	2.7 (In)	0.588	0.486	0.353	0.794