Figure 7.

Dependence of the electronic structure of ${\mathbf{MnBi}}_2{\mathbf{Te}}_4$ on structure alteration. (a) The gap in the Dirac state as function of the first van der Waals spacing expansion; (b) Electronic structure for the slab with the 1-st vdW spacing detached by 15.3%; Spatial charge distribution of the Dirac state at equilibrium structure (c) and for vdW spacing expanded by 15.3% (d); Surface electronic spectrum of ${\text{MnBi}}_2{\text{Te}}_4$ with modified interlayer distances in the outer SL only (e) and the outer SL and the 1-st vdW spacing (f) as taken from Ref. ⁴⁰.