Show simple item record

dc.contributor.authorKiliç, Ç.en_US
dc.contributor.authorMehrez, H.en_US
dc.contributor.authorCiraci, S.en_US
dc.date.accessioned2016-02-08T10:44:18Z
dc.date.available2016-02-08T10:44:18Z
dc.date.issued1998en_US
dc.identifier.issn0163-1829
dc.identifier.urihttp://hdl.handle.net/11693/25409
dc.description.abstractThe conductance through a quantum point contact created by a sharp and hard metal tip on the graphite surface has features which to our knowledge have not been encountered so far in metal contacts or in nanowires. In this paper we first investigate these features which emerge from the strongly directional bonding and electronic structure of graphite, and provide a theoretical understanding for the electronic conduction through quantum point contacts. Our study involves molecular-dynamics simulations to reveal the variation of interlayer distances and atomic structure at the proximity of the contact that evolves by the tip pressing toward the surface. The effects of the elastic deformation on the electronic structure, state density at the Fermi level, and crystal potential are analyzed by performing self-consistent-field pseudopotential calculations within the local-density approximation. It is found that the metallicity of graphite increases under the uniaxial compressive strain perpendicular to the basal plane. The quantum point contact is modeled by a constriction with a realistic potential. The conductance is calculated by representing the current transporting states in Laue representation, and the variation of conductance with the evolution of contact is explained by taking the characteristic features of graphite into account. It is shown that the sequential puncturing of the layers characterizes the conductance.en_US
dc.language.isoEnglishen_US
dc.source.titlePhysical Review B - Condensed Matter and Materials Physicsen_US
dc.titleQuantum point contact on graphite surfaceen_US
dc.typeArticleen_US
dc.departmentDepartment of Physics
dc.citation.spage7872en_US
dc.citation.epage7881en_US
dc.citation.volumeNumber58en_US
dc.citation.issueNumber12en_US
dc.publisherAmerican Physical Societyen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record