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Topological insulators (TIs) are new insulating materials with exotic surfacestates, where the motion of charge carriers is described by the Dirac equationsand their spins are locked in a perpendicular direction to their momentum.Recent studies by angle-resolved photoemission spectroscopy have demonstratedthat a conventional two-dimensional electron gas can coexist with thetopological surface state due to the quantum confinement effect. Thecoexistence is expected to give rise to exotic transport properties, which,however, have not been explored so far. Here, we report a magneto-transportstudy on single crystals of the topological insulator BiSbTe3. BesidesShubnikov-de Haas oscillations and weak anti-localization (WAL) from thetopological surface state, we also observed a crossover from the weakanti-localization to weak localization (WL) with increasing magnetic field,which is temperature dependent and exhibits two-dimensional features. Thecrossover is proposed to be the transport manifestation of the coexistence ofthe topological surface state and two-dimensional electron gas on the surfaceof TIs.

Transport evidence for the coexistence of the topological surface state and a two-dimensional electron gas in BiSbTe3 topological insulator