Muhammad Saqib Abbasi - Academia.edu (original) (raw)
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Papers by Muhammad Saqib Abbasi
Thermal oxidation of the (0001) basal plane of highly oriented pyrolitic graphite leads to the re... more Thermal oxidation of the (0001) basal plane of highly oriented pyrolitic graphite leads to the removal of monoatomic carbon layers from the surface and to the formation of circular pits and steps on the exposed plane. Scanning tunneling microscopy and current imaging tunneling spectroscopy are used to study a localized surface state at the Fermi level on the circular edges of the pit. The surface state appears as the maximum of the local density of states at 10-50 meV below the Fermi level. The appearance of the state does not depend on the orientation of the step. The explanation for this effect includes the superposition of the two different surface states. The first one is due to the existence of an edge in the graphite sheet. The second one is due to fused disclination centers caused by mechanical deformations on the terrace.
Thermal oxidation of the (0001) basal plane of highly oriented pyrolitic graphite leads to the re... more Thermal oxidation of the (0001) basal plane of highly oriented pyrolitic graphite leads to the removal of monoatomic carbon layers from the surface and to the formation of circular pits and steps on the exposed plane. Scanning tunneling microscopy and current imaging tunneling spectroscopy are used to study a localized surface state at the Fermi level on the circular edges of the pit. The surface state appears as the maximum of the local density of states at 10-50 meV below the Fermi level. The appearance of the state does not depend on the orientation of the step. The explanation for this effect includes the superposition of the two different surface states. The first one is due to the existence of an edge in the graphite sheet. The second one is due to fused disclination centers caused by mechanical deformations on the terrace.