Above Tc the thermal Hall conductivity is exactly κ_xy/T = (π² k_B²/6h) C tanh[Δ_pg(T)/(2 k_B T)], fixed by the Chern number and the measurable preformed-pair gap.
The sign flip ofδε(6,4) occurs at ∆cross pg ≈0.507, givingξ cross =v F /∆cross pg = 3.95, consis- tent with √4×6≈4.9
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Parity Anomaly of Preformed Pairs Governs the Thermal Hall Effect above $T_c$
Above Tc the thermal Hall conductivity is exactly κ_xy/T = (π² k_B²/6h) C tanh[Δ_pg(T)/(2 k_B T)], fixed by the Chern number and the measurable preformed-pair gap.