Fig. 4: Ferroelectric polarization switching by PFM for multilayer (10 L and 3 L) ReSe2.
From: Emergence of sliding ferroelectricity in naturally parallel-stacked multilayer ReSe2 semiconductor
a, d Topography, b, e Out-of-phase images after writing box-in-box patterns by applying reverse voltage bias. c, f Local phase (red) and amplitude (blue) hysteresis loops.
