Abstract
In situ high-vacuum scanning tunneling microscopy and scanning tunneling spectroscopy are used to investigate a surface of highly oriented pyrolytic graphite (HOPG) after 200 MeV Au +13 ion irradiation at 2×10 13 ions/cm 2 fluence. The surface topographic image shows the delocalization of the electronic states after swift heavy ion irradiation. The spectroscopy result shows the linear variation of tunneling current with bias voltage after irradiation. The ohmic behavior of I– V curve along with the delocalization of the covalent bonded electronic wave functions suggests the metallic nature of HOPG surface after irradiation. This is attributed to the electronic-excitation-induced enhancement in the metallicity of the bonding orbitals.
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