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We present the Fermi-surface map of the spin-chiral bulk states for thenon-centrosymmetric semiconductor BiTeI using de Haas-van Alphen andShubnikov-de Haas oscillations. We identify two distinct Fermi surfaces with aunique spindle-torus-type topology and the non-trivial Berry phases, confirmingthe spin chirality with oppositely circulating spin-texture. Near the quantumlimit at high magnetic fields, we find a substantial Zeeman effect with aneffective g-factor of ~ 60 for the Rashba-split Fermi surfaces. These findingsprovide clear evidence of strong Rashba and Zeeman coupling in the bulk statesof BiTeI, suggesting that BiTeI is a good platform hosting the spin-polarizedchiral states.

Spin-Chiral Bulk Fermi Surfaces of BiTeI Proven by Quantum Oscillations