A (Sn,Pb,In)Te thin film shows quantum Hall effect with spin- and valley-degeneracy lifting, reported as evidence for a ferroelectricity-induced topological insulator.
Murakami, Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase
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Emergence of ferroelectric topological insulator as verified by quantum Hall effect of surface states in (Sn,Pb,In)Te films
A (Sn,Pb,In)Te thin film shows quantum Hall effect with spin- and valley-degeneracy lifting, reported as evidence for a ferroelectricity-induced topological insulator.