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Weak Topological Insulators in PbTe/SnTe Superlattices | | Gang Yang
; Junwei Liu
; Wenhui Duan
; Chaoxing Liu
; | | Date: |
30 Sep 2013 | | Abstract: | It is desirable to realize topological phases in artificial structures by
engineering electronic band structures. In this paper, we investigate
$(PbTe)_m(SnTe)_{2n-m}$ superlattices along [001] direction and find a robust
weak topological insulator phase for a large variety of layer numbers m and
2n-m. We confirm this topologically non-trivial phase by calculating Z2
topological invariants and topological surface states based on the
first-principles calculations. We show that the folding of Brillouin zone due
to the superlattice structure plays an essential role in inducing topologically
non-trivial phases in this system. This mechanism can be generalized to other
systems in which band inversion occurs at multiple momenta, and gives us a
brand-new way to engineer topological materials in artificial structures. | | Source: | arXiv, 1309.7932 | | Services: | Forum | Review | PDF | Favorites | |
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