  Topological Insulators are the best thermoelectric materials involving a
sophisticated physics beyond their solid state and electronic structure. We
show that exists a topological contribution to the thermoelectric effect that
arise between topological and thermal quantum field theories applied at very
low energies. This formalism provides us with a quantized topological mass
proportional to the temperature T, being both quantities directly related with
an electric potential V and getting a Seebeck coefficient where we identify an
anomalous contribution that we associate to the creation of real electron-hole
Schwinger's pairs close to the topological bands. Finally, we find a general
expression, considering the electronic contribution, for the dimensionless
figure of merit of these topological materials, getting a value of 2.73 that is
applicable to the Bi$_2$Te$_3$, for which it was reported a value of 2.4, using
only the most basic topological numbers (0 or 1).
