Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-dimensional Dirac signature of germanene   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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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: math
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: stat
1
The categories of this paper are: cs