Limits of Validity of Rashba Model in BiTeI: A High-field Magneto-optical Study
| Autor: | Bordacs, S., Orlita, M., Sikula, M., Murakawa, H., Tokura, Y. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 100, 155203 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.100.155203 |
| Popis: | It was recently shown that BiTeI, a semiconductor with polar crystal structure, possesses a giant spin-splitting of electrons, which has been interpreted in terms of Rashba-type spin-orbit coupling. Here, we use high field magneto-optical spectroscopy to quantify the deviations of the conduction-band profile from this appealing, but at the same time, strongly simplifying model. We find that the optical response -- comprising a series of inter-Landau level excitations -- can be described by the Rashba model only at low magnetic fields. In contrast, the high-field response appears to be more consistent with a simple picture of massless electrons in a conical band. This points towards more linear rather than parabolic at energies well above the bottom of the conduction band. Comment: 4 pages, 3 figures |
| Databáze: | arXiv |
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