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. 2021 Jan 4;12:70. doi: 10.1038/s41467-020-20376-w

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — a–c Bias-dependent STM images of G/FL-CrI₃/Gr. STM images taken at (a) V_s = 2.5 V and (b) at V_s = −2.5 V with the superimposed atomic structure of ML-CrI₃ (I atoms on the bottom atomic plane are removed for clarity). STM images taken at (c) V_s = −0.3 V. The tunneling current is I_t = 1 nA. d, e Simulated STM images taken at (d) V_s = 3.1 V and (e) V_s = −2 V with the superimposed atomic structure of ML-CrI₃. f STM image acquired across the single-layer step of CrI₃ (V_s = 0.6 V, I_t = 0.2 nA). g The atomic structure of adjacent CrI₃ layers with rhombohedral stacking and monoclinic stacking. The upper (lower) panels are side (top) views. The top view shows the honeycomb lattice formed by Cr atoms (I atoms are removed for clarity), where the center of each hexagon in the upper (lower) layer is indicated by the red (blue) circle. h The processed STM image of f by using edge enhancement filters to better visualize the atomic lattice of both layers. The lattice of the upper (lower) layer is represented by the red (blue) circle. To intuitively show the atomic translation between two layers, a replica of the upper-layer lattice (translated by (8a + 16b) with respect to the original lattice of the upper layer) is shown as the red circle on the lower layer. The red arrow represents the vector (8a + 16b).