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Dirac fermions in condensed matter physics hold great promise for novelfundamental physics, quantum devices and data storage applications. IV-VIsemiconductors, in the inverted regime, have been recently shown to exhibitmassless topological surface Dirac fermions protected by crystalline symmetry,as well as massive bulk Dirac fermions. Under a strong magnetic field (B), bothsurface and bulk states are quantized into Landau levels that disperse asB^1/2, and are thus difficult to distinguish. In this work, magneto-opticalabsorption is used to probe the Landau levels of high mobility Bi-dopedPb0.54Sn0.46Te topological crystalline insulator (111)-oriented films. The highmobility achieved in these thin film structures allows us to probe anddistinguish the Landau levels of both surface and bulk Dirac fermions andextract valuable quantitative information about their physical properties. Thiswork paves the way for future magnetooptical and electronic transportexperiments aimed at manipulating the band topology of such materials.

Massive and massless Dirac fermions in Pb1-xSnxTe topological crystalline insulator probed by magneto-optical absorption