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Título: | Giant magnetic band gap in the rashba-split surface state of vanadium-doped BiTeI: A combined photoemission and Ab initio study |
Autor: | Klimovskikh, Ilya I.; Shikin, Alexander M.; Otrokov, M. M. CSIC ORCID; Ernst, Arthur; Rusinov, Igor P.; Tereshchenko, Oleg E.; Golyashov, V. A.; Sánchez-Barriga, Jaime; Varykhalov, A. Yu.; Rader, Oliver; Kokh, Konstantin A.; Chulkov, Eugene V. CSIC ORCID | Fecha de publicación: | 2017 | Editor: | Nature Publishing Group | Citación: | Scientific Reports 7: 3353 (2017) | Resumen: | One of the most promising platforms for spintronics and topological quantum computation is the two-dimensional electron gas (2DEG) with strong spin-orbit interaction and out-of-plane ferromagnetism. In proximity to an s-wave superconductor, such 2DEG may be driven into a topologically non-Trivial superconducting phase, predicted to support zero-energy Majorana fermion modes. Using angle-resolved photoemission spectroscopy and ab initio calculations, we study the 2DEG at the surface of the vanadium-doped polar semiconductor with a giant Rashba-Type splitting, BiTeI. We show that the vanadium-induced magnetization in the 2DEG breaks time-reversal symmetry, lifting Kramers degeneracy of the Rashba-split surface state at the Brillouin zone center via formation of a huge gap of about 90 meV. As a result, the constant energy contour inside the gap consists of only one circle with spin-momentum locking. These findings reveal a great potential of the magnetically-doped semiconductors with a giant Rashba-Type splitting for realization of novel states of matter. | Versión del editor: | https://doi.org/10.1038/s41598-017-03507-0 | URI: | http://hdl.handle.net/10261/176723 | DOI: | 10.1038/s41598-017-03507-0 | Identificadores: | doi: 10.1038/s41598-017-03507-0 e-issn: 2045-2322 |
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