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

M. Sakano, J. Miyawaki, A. Chainani, Y. Takata, T. Sonobe, T. Shimojima, M. Oura, S. Shin, M. S. Bahramy, R. Arita, N. Nagaosa, H. Murakawa, Y. Kaneko, Y. Tokura, K. Ishizaka

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

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 three-dimensional (3D) bulk band structures of BiTeI using the bulk-sensitive hν-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 ∼300 meV at the conduction-band minimum and valence-band maximum located in the k z=π/c plane. It provides direct experimental evidence of the 3D Rashba-type spin splitting in a bulk compound.

Original languageEnglish
Article number085204
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number8
DOIs
Publication statusPublished - 2012 Aug 16

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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