Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical absorption of twisted bilayer graphene with interlayer potential
  asymmetry   We investigate the band structure and the optical absorption spectrum of
twisted bilayer graphenes with changing interlayer bias and Fermi energy
simultaneously. We show that the interlayer bias lifts the degeneracy of the
superlattice Dirac point, while the amount of the Dirac point shift is
significantly suppressed in small rotation angles, and even becomes opposite to
the applied bias. We calculate the optical absorption spectrum in various
asymmetric potentials and Fermi energies, and associate the characteristic
spectral features with the band structure. The spectroscopic features are
highly sensitive to the interlayer bias and the Fermi energy, and widely
tunable by the external field effect.

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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
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The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th