Three-dimensional bulk band dispersion in polar BiTeI with giant Rashba-type spin splitting

Abstract

In layered polar semiconductor BiTeI, giant Rashba-type spin-split band dispersions show up due to the crystal structure asymmetry and the strong spin-orbit interaction. Here we investigate the 3-dimensional (3D) bulk band structures of BiTeI using the bulk-sensitive $h\nu$-dependent soft x-ray angle resolved photoemission spectroscopy (SX-ARPES). The obtained band structure is shown to be well reproducible by the first-principles calculations, with huge spin splittings of $\sim 300$ meV at the conduction-band-minimum and valence-band-maximum located in the $k_z=\pi /c$ plane. It provides the first direct experimental evidence of the 3D Rashba-type spin splitting in a bulk compound.

9 pages, 4 figures

References in corpus (2)

• Rashba type spin-orbit splitting of quantum well states in ultrathin Pb films
• Topological Change of the Fermi Surface in Low Density Rashba Gases: Application to Superconductivity

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