We explore the topological behavior of the binary Zintl phase of the alkaline-earth-metal-based compounds Sr2Pb and Sr2Sn using both standard and hybrid density functional theory. It is found that Sr2Pb 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 nontrivial topologically insulating state displays well-defined metallic states in the Sr2Pb(010) surface, whose evolution is studied as a function of the film thickness.
Strain-driven onset of nontrivial topological insulating states in Zintl Sr2X compounds (X = Pb, Sn) / Sun Y; Chen XQ; FRANCHINI, CESARE; Li DZ; Yunoki S; Li YY; Fang Z.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 84:16(2011), pp. 1-5. [10.1103/PhysRevB.84.165127]
Strain-driven onset of nontrivial topological insulating states in Zintl Sr2X compounds (X = Pb, Sn)
FRANCHINI, CESAREMembro del Collaboration Group
;
2011
Abstract
We explore the topological behavior of the binary Zintl phase of the alkaline-earth-metal-based compounds Sr2Pb and Sr2Sn using both standard and hybrid density functional theory. It is found that Sr2Pb 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 nontrivial topologically insulating state displays well-defined metallic states in the Sr2Pb(010) surface, whose evolution is studied as a function of the film thickness.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
