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TT: Fachverband Tiefe Temperaturen
TT 10: Correlated Electrons: Other Theoretical Topics
TT 10.6: Vortrag
Montag, 9. März 2026, 12:15–12:30, HSZ/0103
Stabilization of sliding ferroelectricity through exciton condensation — •Matteo D'Alessio1,2, Daniele Varsano2, Elisa Molinari1,2, and Massimo Rontani2 — 1University of Modena and Reggio Emilia, Department of Physics, Informatics and Mathematics, Modena, Italy — 2CNR Nanoscience Institute, Modena, Italy
Sliding ferroelectricity is a phenomenon that arises from the insurgence of spontaneous electronic polarization perpendicular to the layers of two-dimensional (2D) systems upon the relative sliding of the atomic layer constituents. Because of the weak van der Waals (vdW) interactions between layers, sliding and the associated symmetry breaking can occur at low energy cost in materials such as transition-metal dichalcogenides. Here we discuss theoretically this phenomenon by focusing on a prototype structure, the WTe2 bilayer, where sliding ferroelectricity was first experimentally observed. We compute the significant energy band renormalizations of the ground state induced by excitonic effects and show that in the case of bilayer WTe2 - as long as exciton coherence survives - relevant modifications result in the energetics of the system that contribute to stabilize ferroelectricity upon sliding displacement of the layers. We thus show that electron-hole interaction effects can play an important role in sliding ferroelectricity, where they have been neglected up to now.
Keywords: Sliding ferroelectricity; Excitons; Exciton condensation