Berry Phase and Magnetotransport Evidences for Nontrivial Topology in the Electronic Band Structure of HgSe

Longitudinal and transverse magnetotransport effects were investigated in a monocrystalline HgSe sample (electron concentration n = 4 × 10 cm, electron mobility µ = 1.2 × 10 cm V s) under a planar electric and magnetic field configuration. Analysis of Shubnikov-de Haas oscillations in both longitudinal and transverse magnetoresistance yielded data on the half-filling of the zeroth Landau level and revealed a nontrivial Berry phase. These signatures of the relativistic nature of the HgSe electronic spectrum are complemented by two key magnetotransport signatures of the chiral anomaly: the chiral magnetic effect and the planar Hall effect.