We performed thermoelectric Hall conductivity αxy​ measurements on
single crystal graphite in the quantum limit up to 13 T. Both electrical and
thermoelectric transport measurements were performed on the same crystal to
extract pure αxy​ avoiding any sample quality dependence. The
αxy​ converges to a plateau in the quantum limit with a linear
dependence on temperature. This behavior is analogous to the quantized
thermoelectric Hall effect (QTHE) observed in 3D Dirac/Weyl nodal point
semimetals, and experimentally confirms a theoretical proposal on the QTHE in
semimetals with nodal lines like graphite.Comment: 14 pages, 3 figures, with supplemental informatio