Ultrathin epitaxial graphite: 2D electron gas properties and a route toward graphene-based nanoelectronics

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dc.creatorBerger, Claire
dc.creatorSong, Zhimin
dc.creatorLi, Tianbo
dc.creatorLi, Xuebin
dc.creatorOgbazghi, Asmerom Y.
dc.creatorFeng, Rui
dc.creatorDai, Zhenting
dc.creatorMarchenkov, Alexei N.
dc.creatorConrad, Edward H.
dc.creatorFirst, Phillip N.
dc.creatorde Heer, Walt A.
dc.date2004-10-10
dc.date.accessioned2026-07-07T03:01:23Z
dc.date.available2026-07-07T03:01:23Z
dc.descriptionWe have produced ultrathin epitaxial graphite films which show remarkable 2D electron gas (2DEG) behavior. The films, composed of typically 3 graphene sheets, were grown by thermal decomposition on the (0001) surface of 6H-SiC, and characterized by surface-science techniques. The low-temperature conductance spans a range of localization regimes according to the structural state (square resistance 1.5 kOhm to 225 kOhm at 4 K, with positive magnetoconductance). Low resistance samples show characteristics of weak-localization in two dimensions, from which we estimate elastic and inelastic mean free paths. At low field, the Hall resistance is linear up to 4.5 T, which is well-explained by n-type carriers of density 10^{12} cm^{-2} per graphene sheet. The most highly-ordered sample exhibits Shubnikov - de Haas oscillations which correspond to nonlinearities observed in the Hall resistance, indicating a potential new quantum Hall system. We show that the high-mobility films can be patterned via conventional lithographic techniques, and we demonstrate modulation of the film conductance using a top-gate electrode. These key elements suggest electronic device applications based on nano-patterned epitaxial graphene (NPEG), with the potential for large-scale integration.
dc.description5 pages, figure files: figure1.eps, figure2a.eps, figure2b.eps, figure3.eps
dc.identifierhttps://arxiv.org/abs/cond-mat/0410240
dc.identifierhttp://arxiv.org/abs/cond-mat/0410240
dc.identifierJ. Phys. Chem., vol. 108, pp. 19912-16 (2004)
dc.identifierdoi:10.1021/jp040650f
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/25039
dc.subjectMaterials Science
dc.subjectMesoscale and Nanoscale Physics
dc.titleUltrathin epitaxial graphite: 2D electron gas properties and a route toward graphene-based nanoelectronics
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