Table 1. Dirac point binding energies and Fermi velocities at the surfaces of investigated heterostructures.

Sample	EB(DP) (meV)	vF (105 ms−1)
Pure Sb2Te3	−65	4.4
25 QL	−35	2.5
15 QL	+30	2.2
7 QL	+140	5.2
6 QL	+145	4.8

Binding energy position of the Dirac point is extracted from the superimposed calculations. Negative (positive) binding energy refers to the unoccupied (occupied) band structure above (below) the Fermi level. Third column shows the Fermi velocities derived from linear fits to the surface states close to the Fermi level.