Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatially resolved electronic structure of twisted graphene   We have used scanning tunneling microscopy and spectroscopy to resolve the
spatial variation of the density of states of twisted graphene layers on top of
a highly oriented pyrolytic graphite substrate. Owing to the twist a moire
pattern develops with a periodicity that is substantially larger than the
periodicity of a single layer graphene. The twisted graphene layer has
electronic properties that are distinctly different from that of a single layer
graphene due to the nonzero interlayer coupling. For small twist angles (about
1-3.5 degree) the integrated differential conductivity spectrum exhibits two
well-defined Van Hove singularities. Spatial maps of the differential
conductivity that are recorded at energies near the Fermi level exhibit a
honeycomb structure that is comprised of two inequivalent hexagonal
sub-lattices. For energies |E-E_F|>0.3 eV the hexagonal structure in the
differential conductivity maps vanishes. We have performed tight-binding
calculations of the twisted graphene system using the propagation method, in
which a third graphene layer is added to mimic the substrate. This third layer
lowers the symmetry and explains the development of the two hexagonal
sub-lattices in the moire pattern. Our experimental results are in excellent
agreement with the tight-binding calculations.

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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: math
5
The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg