Fig. 5: High-temperature response of R and VTh of MATBLG, and comparison with Mott formula.
From: Thermopower probes of emergent local moments in magic-angle twisted bilayer graphene
a, The evolution of R with ν for T in the range 70–300 K. Beyond 100 K, the flat-band features fade and show a graphene-like resistance spectrum. b, The evolution of VTh with ν within the temperature range 70–300 K. For T within 80–100 K, the VTh remains flat and close to zero within the doping range ∣ν∣ ≈ 2. For T beyond 120 K, VTh remains negative (positive) throughout the conduction (valence) band, similar to graphene. c, Validation of Mott, measured VTh and derivative of resistance (dlnR/dν) of MATBLG at several T. The dlnR/dν in light-blue lines and VTh in orange curves. The violation of the Mott formula persists up to 120 K, beyond which VTh starts to fall in good agreement with Mott, as evident from 200 K and 300 K data.
