engleski

Evidence of 3D Dirac dispersion in PbSnSe by the de Haas - van Alphen oscillations

Single crystals of mixed chalcogenide PbSnSe in composition Pb0.83Sn0.17Se is predicted to be a 3D Dirac semimetal. Materials with a 3D linear band dispersion represent a novel class of material which is an extension of the well- known 2D Dirac dispersion in graphene. Recently predicted and discovered materials with the 3D Dirac dispersion are Cd2As3, Na3Bi and topological insulators at the topological phase transition, of which PbSnSe is an example. By SQUID magnetometry up to 5T we have observed well-defined de Haas von Alphon oscillations. Temperature analysis of the dHvA oscillations allowed us to find microscopic parameters such as the scattering time, effective mass and charge concentration. Analyzing the phase of dHvA oscillations we observed the π-Berry phase shift which is a result of the linear band dispersion.

Dirac Semimetals; SdH Oscillations

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