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Topological crystal insulator (TCI) and topological Dirac semimetals have topologically nontrivial surface and bulk state, respectively. The parent compound of Pb0.5Sn0.5Te exhibiting TCI band inversion has particle-hole symmetry owing to the gapless Dirac band implying a strong electron–hole bipolar compensation in Seebeck coefficient. We recently reported that weak perturbation of TCI state can...
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