Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tuning Structures and Electronic Spectra of Graphene Layers by Tilt
  Grain Boundaries   Despite the structures and properties of tilt grain boundaries of graphite
surface and graphene have been extensively studied, their effect on the
structures and electronic spectra of graphene layers has not been fully
addressed. Here we study effects of one-dimensional tilt grain boundaries on
structures and electronic spectra of graphene multilayers by scanning tunneling
microscopy and spectroscopy. A tilt grain boundary of a top graphene sheet in
graphene multilayers leads to a twist between consecutive layers and generates
superstructures (Moir\'e patterns) on one side of the boundary. Our results
demonstrate that the twisting changes the electronic spectra of Bernal graphene
bilayer and graphene trilayers dramatically. We also study quantum-confined
twisted graphene bilayer generated between two adjacent tilt grain boundaries
and find that the band structure of such a system is still valid even when the
number of superstructures is reduced to two in one direction. It implies that
the electronic structure of this system is driven by the physics of a single
Moir\'e spot.

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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas