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Abstract:
Besides of their well-known wide range of properties it was recently
shown that many of the heavy Heusler semiconductors with 1:1:1
composition and C1(b) structure exhibit a zero band gap behavior and are
topological insulators induced by their inverted band structure. In the
present study, the electronic structure of the Heusler compounds PtYSb
and PtLaBi was investigated by bulk sensitive hard x-ray photoelectron
spectroscopy. The measured valence band spectra are clearly resolved and
in well agreement to the first-principles calculations of the electronic
structure of the compounds. The experimental results give clear evidence
for the zero band gap state. (C) 2011 American Institute of Physics.
[doi: 10.1063/1.3592834]