γ-Bi4X4 (X=Br, I) is predicted as a stable 3D topological ferroelectric insulator with spin Chern number 2 and switchable z-polarization.
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Exciton condensation stabilizes sliding ferroelectricity in WTe2 bilayer through band renormalizations induced by electron-hole interactions.
citing papers explorer
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Three-dimensional topological ferroelectrics
γ-Bi4X4 (X=Br, I) is predicted as a stable 3D topological ferroelectric insulator with spin Chern number 2 and switchable z-polarization.
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Stabilization of sliding ferroelectricity through exciton condensation
Exciton condensation stabilizes sliding ferroelectricity in WTe2 bilayer through band renormalizations induced by electron-hole interactions.