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We have extended our new materials class search for the experimentalrealization of Z2 topological insulators from binary [Bi2Se3-class, Xia et.al.,Nature Phys. 5, 398 (2009)] and the ternary [Half-Heusler class, Lin et.al.,arXiv:1003.0155v1 (2010); arXiv:1003.2615v1 (2010)] series to non-HeuslerLi-based ternary intermetallic series Li2M'X ($M'$=Cu, Ag, and Au, $X$=Sb andBi) with CuHg2Ti-type structure. We discovered that the distorted-Li2AgSb is alightweight compound harboring a 3D topological insulator state with Z2=-1although the groundstate lies near a critical point, whereas the relatedLi2CuSb-type compounds are topologically trivial. Non-Heusler ternary Li2M'Xseries (with a number of variant compounds) we identified here is a newplatform for deriving novel stoichiometric compounds, artificialquantum-well/heterostructures, nano-wires, nano-ribbons and nanocrystals. Wehave grown some of these bulk materials (experimental results will be reportedseparately).

Single-Dirac-cone Z2 topological insulator phases in distorted Li2AgSb-class and related quantum critical Li-based spin-orbit compounds