Emergence of surface states in nanoscale Cu2N islands

Article

关键词: SCANNING TUNNELING MICROSCOPE;    AUGMENTED-WAVE METHOD;    SPECTROSCOPY;    SCATTERING;    CLUSTERS;    ATOM;   

DOI  :  10.1103/PhysRevB.83.245430

来源: SCIE

【 摘 要 】

We studied electronic states in nanoscale Cu2N islands on Cu(100) using scanning tunneling microscopy and density functional theory. Tunneling spectra indicate a state at similar to 2 V in large islands (>20 nm(2)), which shifts due to quantum confinement in smaller islands. This state is not observed for islands with fewer than similar to 50 atoms. In contrast, a 4 V state persists down to 12 atom islands, but it does not shift within experimental error. Theory suggests that these differences reflect the different effective masses of the two Cu2N bands, as well as their coupling to a Cu surface state.

【 授权许可】

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