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No bulk thermal currents in massive Dirac fermions

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arxiv 2404.16937 v1 pith:RYONILM3 submitted 2024-04-25 cond-mat.mes-hall

No bulk thermal currents in massive Dirac fermions

classification cond-mat.mes-hall
keywords bulkcurrentdimensionaldiracdomainfermionsmassivesystem
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We calculate the energy current flowing in the bulk of a (2+1)-dimensional system of massive Dirac fermions and along a (1+1)-dimensional domain wall generated by flipping the sign of the particle mass. We show that, at low temperatures and in the long-wavelenghth limit, the system does not support a bulk thermal Hall current proportional to the temperature gradient. The only such contribution is due to states localised at the domain wall. This puts an end to a controversy existing in the literature and amends previous results obtained via first-order perturbation calculations.

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