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arXiv · 1706.00642

Two-dimensional Dirac signature of germanene

L. Zhang·P. Bampoulis·A. van Houselt·H. J. W. Zandvliet
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Abstract

The structural and electronic properties of germanene coated Ge$_2$Pt clusters have been determined by scanning tunneling microscopy and spectroscopy at room temperature. The interior of the germanene sheet exhibits a buckled honeycomb structure with a lattice constant of 4.3 \AA and a buckling of 0.2 \AA. The zigzag edges of germanene are reconstructed and display a 4$\times$ periodicity. The differential conductivity of the interior of the germanene sheet has a V-shape, which is reminiscent of the density of states of a two-dimensional Dirac system. The minimum of the differential conductivity is located close to the Fermi level and has a non-zero value, which we ascribe to the metallic character of the underlying Ge$_2$Pt substrate. Near the reconstructed germanene zigzag edges the shape of the differential conductivity changes from a V-shape to a more parabolic-like shape, revealing that the reconstructed germanene zigzag edges do not exhibit a pronounced metallic edge state.

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L. Zhang, P. Bampoulis, A. van Houselt, H. J. W. Zandvliet. 2017-06-02. Two-dimensional Dirac signature of germanene. https://doi.org/10.1063/1.4931102

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