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. 2018 Jul 13;4(7):eaar7720. doi: 10.1126/sciadv.aar7720

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 4 — (A) AFM topography image of β′-In₂Se₃. Inset: Optical image of the cantilever and the exfoliated crystal. The horizontal scanning direction is indicated by the black double-headed arrow. (B and C) PFM amplitude and phase of vertical signal. (D and E) PFM amplitude and phase of lateral signal. (F) Schematic of the example optical axis (white double-headed arrow) and ferroelectric polarization directions (white/black arrows) of the domains. Scale bars, 5 and 30 μm (inset).