We have investigated band structures of a series of 28 ternary half-Heusler compounds M M′ X of MgAgAs type, where M= (Lu,La,Sc,Y) and M′ X= (PtBi,AuPb,PdBi,PtSb,AuSn,NiBi,PdSb). Our results show that the Z2 topological order is due to a single band inversion at the Γ point. In native states, these half-Heusler compounds are identified as being topologically nontrivial semimetals, or nontrivial metals, or trivial insulators, which can be turned into insulating thin films on suitable substrates. Our analysis reveals a straightforward relationship which connects the band inversion strength (extent of deviation from the critical point) to the atomic charge of constituents and the lattice parameter. Our findings suggest a general method for identifying Z2 topological insulators in nonmagnetic ternary compounds.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Sep 24 2010|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics