Abstract
We report the observation of Shubnikov--de Haas oscillations in single crystals of the Rashba spin-splitting compound BiTeI, from both longitudinal [${R}_{xx}(B)$] and Hall [${R}_{xy}(B)$] magnetoresistance. Under magnetic fields up to 65 T, we resolved unambiguously only one frequency $F=284.3\ifmmode\pm\else\textpm\fi{}1.3$ T, corresponding to a Fermi momentum ${k}_{F}=0.093\ifmmode\pm\else\textpm\fi{}0.002$ \AA{}${}^{\ensuremath{-}1}$. The amplitude of oscillations is strongly suppressed by a tilting magnetic field, suggesting a highly two-dimensional Fermi surface. Combining with optical spectroscopy, we show that quantum oscillations may be consistent with a bulk conduction band having a Rashba splitting momentum ${k}_{R}=0.046\ifmmode\pm\else\textpm\fi{}0.0005$ \AA{}${}^{\ensuremath{-}1}$.
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