Fig. 1: Structural characterization and zero-field band structure calculation.

a Epistructure of sample 1445. b Cross-sectional TEM image and c EDS image of the SL structure of 1445. d The calculated in-plane band structure of 1445 near Γ point. e The calculated energy dispersion along the growth direction (z direction) of both the normal (1445) and inverted (1446) samples.