Patterning germanene into superlattices: An efficient method for tuning conducting properties

摘要: Abstract Using first-principles calculations, we have investigated electronic properties of germanene superlattices. Though bandgap can be obtained in all the superlattices by sublattice equivalence breaking, it could only opened some inversion symmetry preserved with Γ as four-fold degenerate Dirac point. The D 6h antidot, though does not harm symmetry, still open perturbing degeneracy. Furthermore, either breaking or degeneracy perturbation continuously narrowed through reducing defect density germanene. These results are interesting to call for further theoretical and experimental studies.