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. 2016 Dec 12;7:13713. doi: 10.1038/ncomms13713

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) STM topographic image of Bi-doped SnSe. The dotted ellipses indicate Bi dopants. (b) High resolution image of a Bi dopant taken from one of the circled areas in a. The height scale (Δz) is given by the colour bar on the right of the STM images. (c) Simulated STM image of SnSe supercell with Bi dopant at Sn site. ρ in the colour bar represents charge density (e Å⁻³). The white arrows in b,c indicate the substitutional Bi atoms occupying Sn site. All STM images were taken with V_b=−1.8 V and I_t=30 pA.