Armchair nanoribbons of silicon and germanium honeycomb structures

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buir.contributor.authorÇıracı, Salim
buir.contributor.orcidÇıracı, Salim|0000-0001-8023-9860
dc.citation.epage195120-6en_US
dc.citation.issueNumber19en_US
dc.citation.spage195120-1en_US
dc.citation.volumeNumber81en_US
dc.contributor.authorCahangirov, S.en_US
dc.contributor.authorTopsakal, M.en_US
dc.contributor.authorÇıracı, Salimen_US
dc.date.accessioned2016-02-08T09:58:29Z
dc.date.available2016-02-08T09:58:29Z
dc.date.issued2010en_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractWe present a first-principles study of bare and hydrogen passivated armchair nanoribbons of the puckered single layer honeycomb structures of silicon and germanium. Our study includes optimization of atomic structure, stability analysis based on the calculation of phonon dispersions, electronic structure, and the variation in band gap with the width of the ribbon. The band gaps of silicon and germanium nanoribbons exhibit family behavior similar to those of graphene nanoribbons. The edges of bare nanoribbons are sharply reconstructed, which can be eliminated by the hydrogen termination of dangling bonds at the edges. Periodic modulation of the nanoribbon width results in a superlattice structure which can act as a multiple quantum well. Specific electronic states are confined in these wells. Confinement trends are qualitatively explained by including the effects of the interface. In order to investigate wide and long superlattice structures we also performed empirical tight-binding calculations with parameters determined from ab initio calculations.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T09:58:29Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2010en
dc.identifier.doi10.1103/PhysRevB.81.195120en_US
dc.identifier.issn1098-0121
dc.identifier.urihttp://hdl.handle.net/11693/22317
dc.language.isoEnglishen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1103/PhysRevB.81.195120en_US
dc.source.titlePhysical Review B - Condensed Matter and Materials Physicsen_US
dc.titleArmchair nanoribbons of silicon and germanium honeycomb structuresen_US
dc.typeArticleen_US

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