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. 2019 Apr 16;10:1775. doi: 10.1038/s41467-019-09669-x

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© The Author(s) 2019

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 — Atomic structure and theoretical calculations on ferroelectricity in d1T-MoTe₂. a Top-view HRTEM image and intensity profile, the atomic structure of d1T-MoTe₂ is placed on top, scale-bar, 0.5 nm. b Atomic structure image of monolayer d1T-MoTe₂ and the inset shows atomic structure model (cyan and orange colors represent Mo and Te atoms, respectively), scale-bar, 2 Å. c Phonon dispersion of d1T-MoTe₂. d, e Top-view and side-view of charge density difference between ferroelectric d1T and paraelectric 1T phases (green, purple, cyan, orange, and pink colors denote negative charge, positive charge, Mo atom, Te atom, and polarization, respectively)