Fig. 4 Borophene-graphene vertical heterostructures.

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Presentation transcript:

Fig. 4 Borophene-graphene vertical heterostructures. Borophene-graphene vertical heterostructures. (A) STM topography image of a triangular borophene-intercalated graphene domain (Vs = 35 mV, It = 250 pA) with a CO-functionalized tip in CC mode and (B) differential tunneling conductance map of the same region (Vs = −50 mV, It = 200 pA). (C) Point STS spectra of graphene and borophene-intercalated graphene (stabilized at Vs = −0.1 V, It = 100 pA). (D) Zoomed-in STM image of the graphene-graphene/borophene interface (red arrowheads) indicated by the red dashed rectangle in (A) (Vs = 35 mV, It = 250 pA). (E) Zoomed-in STM image of borophene-intercalated graphene domain indicated by the yellow dashed rectangle in (A) with a CO-functionalized tip in CH mode (stabilized at Vs = 30 mV, It = 500 pA). (F) STM topography image and (G) simultaneously acquired |dlnI/dz| image of borophene-intercalated graphene with a bare metal tip (Vs = −8 mV, It = 500 pA). A linear structure with 5 Å periodicity is marked in (F). The graphene lattice is marked in (G). (H) Fourier transform of the image in (G), showing an orthogonal pair of points corresponding to a rectangular lattice (3 Å × 5 Å). (I) Schematic representation of the rotationally commensurate borophene-graphene vertical heterostructure, where the boron row direction and the graphene AC direction are aligned as indicated by the pink and gray arrows, respectively. Xiaolong Liu, and Mark C. Hersam Sci Adv 2019;5:eaax6444 Copyright © 2019 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).