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We describe the fine structure of Dirac states in HgTe/CdHgTe quantum wellsof critical and close-to-critical thickness and demonstrate the formation of ananticrossing gap between the tips of the Dirac cones driven by interfaceinversion asymmetry. By combining symmetry analysis, atomistic calculations,and k-p theory with interface terms, we obtain a quantitative description ofthe energy spectrum and extract the interface mixing coefficient. Thezero-magnetic-field splitting of Dirac cones can be experimentally revealed instudying magnetotransport phenomena, cyclotron resonance, Raman scattering, orTHz radiation absorption.

Split Dirac cones in HgTe/CdTe quantum wells due to symmetry-enforced level anticrossing at interfaces