Effective masses of holes and electrons of the VBM and CBM along different directions for the different β-NX materials, using the HSE06 method.

Material	Carrier type	m*(me)		Carrier type	m*(me)
		A–Y	A–Γ		X–S	X–Γ
AgS	Electrons	0.33	0.32	Holes	−3.44	−1.09
AgSe		0.28	0.25		−2.63	−1.38
AgTe		0.25	0.21		−5.34	−1.48
AuS		0.43	0.38		−9.95	−0.60
AuTe		0.26	0.23		−4.99	−0.67