Massless Electrons on Hexagonal Dangling Bond Network on Hydrogen Deposited Diamond (111) and Si(111) Surfaces
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概要
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Based on total-energy electronic-structure calculations within density functional theory, we find that massless electrons emerge on hexagonally arranged dangling bond networks on partially hydrogen-covered (111) surfaces of diamond and Si. Fermi velocities for linear dispersion bands on diamond and Si are 10% slower than that of graphene. The linear dispersion bands on diamond (111) surfaces are found to be robust against surface reconstructions, while those on Si(111) surfaces are fragile to 2\times 1 buckling reconstruction. We further show that Fermi velocity and electron correlation in the hexagonal dangling bond networks on diamond (111) surfaces are tunable by controlling the coverage of H atoms on the surfaces and the substrate atom species.
- 2013-06-15
著者
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Okada Susumu
Graduate School of Pure and Applied Sciences and Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan
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Sone Junki
Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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