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The recently observed large Rashba-type spin splitting in the BiTeX (X = I,Br, Cl) bulk states due to the absence of inversion asymmetry and large chargepolarity enables observation of the transition in Fermi surface topology fromspindle-torus to torus with varying the carrier density. These BiTeX systemswith high spin-orbit energy scales offer an ideal platform for achievingpractical spintronic applications and realizing non-trivial phenomena such astopological superconductivity and Majorana fermions. Here we use Shubnikov-deHaas oscillations to investigate the electronic structure of the bulkconduction band of BiTeCl single crystals with different carrier densities. Weobserve the topological transition of the Fermi surface (FS) from aspindle-torus to a torus. The Landau level fan diagram reveals the expectednon-trivial {\pi} Berry phase for both the inner and outer FSs. Angle-dependentoscillation measurements reveal three-dimensional FS topology when the Fermilevel lies in the vicinity of the Dirac point. All the observations areconsistent with large Rashba spin-orbit splitting in the bulk conduction band.

Observation of topological transition of Fermi surface from a spindle-torus to a torus in large bulk Rashba spin-split BiTeCl