Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.117401
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Funding
- MEXT [20740167, 19048008, 19048015, 21244053]
- Japan Science and Technology Agency
- Japan Society for the Promotion of Science (JSPS)
- DAAD
- Grants-in-Aid for Scientific Research [20740167, 21244053] Funding Source: KAKEN
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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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