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Clean two-dimensional Dirac systems have received a lot of attention forbeing a prime candidate to observe hydrodynamical transport behavior ininteracting electronic systems. This is mostly due to recent advances in thepreparation of ultrapure samples with sufficiently strong interactions. In thispaper, we investigate the role of collective modes in the thermo-electrictransport properties of those systems. We find that dynamical particle-holepairs, plasmons, make a sizeable contribution to the thermal conductivity.While the increase at the Dirac point is moderate, it becomes large towardslarger doping. We suspect, that this is a generic feature of ultracleantwo-dimensional electronic systems, also applicable to degenerate systems.

Thermo-electric response in two-dimensional Dirac systems: the role of particle-hole pairs