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Giant magnetic band gap in the rashba-split surface state of vanadium-doped BiTeI: A combined photoemission and Ab initio study

AuthorsKlimovskikh, Ilya I.; Shikin, Alexander M.; Otrokov, M. M.; Ernst, A.; Rusinov, Igor P.; Tereshchenko, O. E.; Golyashov, V. A.; Sánchez-Barriga, J.; Varykhalov, A. Yu.; Rader, O.; Kokh, K. A.; Chulkov, Eugene V.
Issue Date2017
PublisherNature Publishing Group
CitationScientific Reports 7: 3353 (2017)
AbstractOne 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.
Publisher version (URL)https://doi.org/10.1038/s41598-017-03507-0
Identifiersdoi: 10.1038/s41598-017-03507-0
e-issn: 2045-2322
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