Transition from edge- to bulk-currents in the quantum Hall regime

The supplementary material contains a complete set of Hall measurements with the inner contact floated or grounded, respectively, as well as a detailed explanation of the current flow into the inner contact including a comparison with the Corbino geometry. We also present additional data exploring the breakdown of the quantum Hall effect. They indicate that the inner contact current presented in the main article is not related with the breakdown of the quantum Hall effect.