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. 2016 Sep 15;6:33487. doi: 10.1038/srep33487

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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) Large scale STM topographic image (1000 × 1000 nm², 800 meV, 0.5 nA), (b) STM image of trilayer graphene over a terrace (25 × 25 nm², 100 mV, 200 pA), (c) STS spectrum acquired in the zone A, left side of the figure (b,d) STS spectrum acquired in the zone B, right side of figure (b). The local minimum in the dI/dV curves highlighted by the arrow indicate the position of the Dirac point.