Optical response of relativistic electrons in the polar BiTeI semiconductor

J. S. Lee, G. A.H. Schober, M. S. Bahramy, H. Murakawa, Y. Onose, R. Arita, N. Nagaosa, Y. Tokura

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Abstract

The transitions between the spin-split bands by spin-orbit interaction are relevant to many novel phenomena such as the resonant dynamical magnetoelectric effect and the spin Hall effect. We perform optical spectroscopy measurements combined with first-principles calculations to study these transitions in the recently discovered giant bulk Rashba spin-splitting system BiTeI. Several novel features are observed in the optical spectra of the material including a sharp edge singularity due to the reduced dimensionality of the joint density of states and a systematic doping dependence of the intraband transitions between the Rashba-split branches. These confirm the bulk nature of the Rashba-type splitting in BiTeI and manifest the relativistic nature of the electron dynamics in a solid.

Original languageEnglish
Article number117401
JournalPhysical Review Letters
Volume107
Issue number11
DOIs
Publication statusPublished - 2011 Sep 9
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Lee, J. S., Schober, G. A. H., Bahramy, M. S., Murakawa, H., Onose, Y., Arita, R., Nagaosa, N., & Tokura, Y. (2011). Optical response of relativistic electrons in the polar BiTeI semiconductor. Physical Review Letters, 107(11), [117401]. https://doi.org/10.1103/PhysRevLett.107.117401