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  • Title: Optical response of relativistic electrons in the polar BiTeI semiconductor.
    Author: Lee JS, Schober GA, Bahramy MS, Murakawa H, Onose Y, Arita R, Nagaosa N, Tokura Y.
    Journal: Phys Rev Lett; 2011 Sep 09; 107(11):117401. PubMed ID: 22026701.
    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.
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