Giant surface charge density of graphene resolved from scanning tunneling microscopy and first-principles theory

Article

关键词: ELECTRONIC-PROPERTIES;    ATOMIC-STRUCTURE;    GRAPHITE;    IMAGES;    SPECTROSCOPY;    TRANSPORT;    FILMS;   

DOI  :  10.1103/PhysRevB.84.161409

来源: SCIE

【 摘 要 】

In this work, systematic constant-bias, variable-current scanning tunneling microscopy (STM) measurements and STM simulations from density-functional theory are carried out, yielding critical insights into the spatial structure of electrons in graphene. A foundational comparison is drawn between graphene and graphite, showing the surface charge density of graphene to be 300% that of graphite. Furthermore, simulated STM images reveal that high-current STM better resolves graphene's honeycomb bonding structure because of a retraction which occurs in the topmost dangling bond orbitals.

【 授权许可】

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