Fig. 2: Theoretical analysis of ferroelectricity in ReSe2 flakes.
From: Emergence of sliding ferroelectricity in naturally parallel-stacked multilayer ReSe2 semiconductor
a Schematic illustration of the atomic arrangement for parallel stacking. b, c Schematic illustration of the atomic arrangement for different polarization directions (state 1 and 2), and the state 2 can be obtained by mirroring the state 1 with respect to the central horizontal plane. d Ferroelectric switching pathway for multilayer ReSe2 from polar state 1 to polar state 2. e The charge density difference between the layers in polar state 1 produces a vertical polarization. The arrows indicate the polarization direction. Purple and yellow spheres represent Re and Se atoms, respectively.
