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Using the non-commutative Kubo formula for aperiodic solids [1-3] and arecently developed numerical implementation [4], we study the conductivity$\sigma$ and resistivity $\rho$ tensors as functions of Fermi level andtemperature, for models of strongly disordered Chern insulators. The formalismenabled us to converge the transport coefficients at temperatures low enough toenter the quantum critical regime at the Chern-to-trivial insulator transition.We find that the $\rho_{xx}$-curves at different temperatures intersect eachother at one single critical point, and that they obey a single-parameterscaling law with an exponent close to the universally accepted value for theunitary symmetry class. However, when compared with the establishedexperimental facts on the plateau-insulator transition in the Integer QuantumHall Effect, we find a universal critical conductance $\sigma_{xx}^c$ twice aslarge, an ellipse rather than a semi-circle law, and absence of the quantizedHall insulator phase.

Quantum criticality at the Chern-to-normal insulator transition