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Strain driven onset of non-trivial topological insulating states in Zintl Sr₂X compounds (X=Pb, Sn)

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arxiv 1105.5841 v1 pith:AYCT254T submitted 2011-05-30 cond-mat.mtrl-sci

Strain driven onset of non-trivial topological insulating states in Zintl Sr₂X compounds (X=Pb, Sn)

classification cond-mat.mtrl-sci
keywords topologicalcompoundsinsulatingnon-trivialstatesstrainzintlalkaline
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We explore the topological behavior of the binary Zintl phase of the alkaline earth metals based compounds Sr$_2$Pb and Sr$_2$Sn using both standard and hybrid density functional theory. It is found that Sr$_2$Pb lies on the verge of a topological instability which can be suitably tuned through the application of a small uniaxial expansion strain ($>$ 3%). The resulting non-trivial topologically insulating state display well-defined metallic states in the Sr$_{2}$Pb(010) surface, whose evolution is studied as a function of the film thickness.

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