Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Correlated states in magic angle twisted bilayer graphene under the
  optical conductivity scrutiny   Moir\'e systems displaying flat bands have emerged as novel platforms to
study correlated electron phenomena. Insulating and superconducting states
appear upon doping magic angle twisted bilayer graphene (TBG), and there is
evidence of correlation induced effects at the charge neutrality point (CNP)
which could originate from spontaneous symmetry breaking. Our theoretical
calculations show how optical conductivity measurements can distinguish
different symmetry breaking states, and reveal the nature of the correlated
states. In the specific case of nematic order, which breaks the discrete
rotational symmetry of the lattice, we find that the Dirac cones are displaced,
not only in momentum space but also in energy, inducing finite Drude weight at
the CNP. We also show that the sign of the dc conductivity anisotropy induced
by a nematic order depends on the degree of lattice relaxation, the doping and
the nature of the symmetry breaking.

3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: hep-lat