Quantum oscillations and optical conductivity in Rashba spin-splitting BiTeI

Abstract

We report the observation of Shubnikov-de Haas (SdH) 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 field up to 65 T, we resolved unambiguously only one frequency $F=284.3\pm 1.3$ T, corresponding to a Fermi momentum $k_F=0.093\pm 0.002$Å${}^{-1}$.The amplitude of oscillations is strongly suppressed by 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 $k_R=0.046\pm$Å${}^{-1}$.

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• Strong spin-orbit splitting on Bi surfaces
• Topological origin of subgap conductance in insulating bilayer graphene
• Two-dimensional Dirac fermions in a topological insulator: transport in the quantum limit
• Ideal two-dimensional electron systems with a giant Rashba-type spin splitting in real materials: surfaces of bismuth tellurohalides
• Giant ambipolar Rashba effect in a semiconductor: BiTeI
• Three-dimensional bulk band dispersion in polar BiTeI with giant Rashba-type spin splitting

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