Extended Data Fig. 6: Field-orientation-dependent nonlocal transport in presence of nonuniform edge accumulation.

Numerical simulations of the normalized potential \({\mathscr{V}}\) (left column) and of the magnitude of the normalized current density \({\mathscr{J}}\) (right column) at B = ±4 T and λ = 2.54W (η = 0.05, V_bg = −4 V) for the case of charge edge accumulation being present only in the top-right and bottom-left quadrants of the sample indicated by the pink outlines in b. a, b, B = 4 T and V₀ applied to the top contact. Highly nonlocal transport is observed similar to the case presented in Fig. 4e, f with charge accumulation along the entire edges. c, d, Same as a, b but with V₀ applied to the bottom contact. The polarities of the potentials and the currents are flipped but the spatial distributions remain the same. e, f, B = −4 T and V₀ applied to the top contact. The transport becomes local resembling the ohmic case in Fig. 4c, d in absence of edge accumulation. g, h, Same as e, f but with V₀ applied to the bottom contact. The transport remains local with flipped current and potential polarities. This nonuniform edge accumulation exemplifies the strong field-orientation dependence of the nonlocal transport that can arise in presence of edge accumulation disorder.