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In this paper, the authors report the results of an experimental study ofeffective mass, electron mobility and phase shift of Shubnikov de Haasoscillations of transverse magnetoresistance in an extended electronconcentration region from 8.8*10^15 cm^-3 to 4.3*10^18 cm^-3 in single crystalsof mercury selenide. The revealed features confirm the existence of a Weylsemimetal phase in HgSe at low electron density, which has been indicated byprevious magnetotransport studies. However, the most significant result is thediscovery of an abrupt change of Berry phase of Pi at electron concentration2*10^18 cm^-3, which we explain in terms of a manifestation of topologicalLifshitz transition in HgSe that occurs by tuning Fermi energy via doping.

Nontrivial topology of bulk HgSe from the study of cyclotron effective mass, electron mobility and phase shift of Shubnikov-de Haas oscillations