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The quadratic nodal line is a one-dimensional double degenerate line with quadratic dispersion. The only necessary symmetries for QNL are threefold rotation symmetry C3 and the combination of mirror perpendicular to the rotation axis and time-reversal symmetry M T . Here, the Δ ( 0 , 0 , k z ) high symmetry line of magnetic little co-group in P 6 3 ′ / m ′ m ′ c is considered.
INTRODUCTION Compared to synthetic carbon materials such as graphene and carbon nanotubes (1), heavy hydrocarbon (HH)–based materials such as coal, tar, and pitch have rarely been explored as an affordable and abundant material for electronics and optoelectronic applications (2, 3).
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