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We demonstrate evidences of electronic transport via topological Diracsurface states in a thin film of strained HgTe. At high perpendicular magneticfields, we show that the electron transport reaches the quantum Hall regimewith vanishing resistance. Furthermore, quantum Hall transport spectroscopyreveals energy splittings of relativistic Landau levels specific to coupledDirac surface states. This study provides new insights in the quantum Halleffect of topological insulator (TI) slabs, in the cross-over regime betweentwo- and three-dimensional TIs, and in the relevance of thin TI films toexplore novel circuit functionalities in spintronics and quantumnanoelectronics.

Revealing topological Dirac fermions at the surface of strained HgTe thin films via Quantum Hall transport spectroscopy