  In a recent work, a contribution to the Nernst current of a Dirac or Weyl
semimetal coming from the conformal anomaly was reported. Being originated from
an anomaly - a vacuum contribution -, a non-zero transport coefficient was
predicted at zero temperature and chemical potential. In this work we perform a
Kubo formula calculation of the thermoelectrical coefficient and confirm that
the result agrees with the quantum field theory estimation in the limit of zero
temperature and chemical potential. For finite chemical potential {\mu} around
{\mu} = 0 the transverse Seebeck coefficient shows a plateau indicating that
only the zero conformal Landau levels contributes to this intrinsic effect.
This result opens the way to the experimental observation of a geometric
anomaly which is much harder to explore than the standard chiral anomaly.
