Giant magnetic band gap in the Rashba-split surface state of vanadium-doped 
BiTel: A combined photoemission and ab initio study

Klimovshikh, I. I.; Shikin, A. M.; Otrokov, M. M.; Ernst, A.; Rusinov, I. P.; Tereshchenko, O. E.; Golyashov, V. A.; Sanchez-Barriga, J.; Varykhalov, A. Yu.; Rader, O.; Kokh, K. A.; Chulkov, E. V.

doi:10.1038/s41598-017-03507-0

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Giant magnetic band gap in the Rashba-split surface state of vanadium-doped BiTel: A combined photoemission and ab initio study

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Ernst, A.
Max Planck Institute of Microstructure Physics, Max Planck Society;

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Klimovshikh, I. I., Shikin, A. M., Otrokov, M. M., Ernst, A., Rusinov, I. P., Tereshchenko, O. E., et al. (2017). Giant magnetic band gap in the Rashba-split surface state of vanadium-doped BiTel: A combined photoemission and ab initio study. Scientific Reports, 7: 3353. doi:10.1038/s41598-017-03507-0.

Cite as: https://hdl.handle.net/21.11116/0000-000B-2341-4

Abstract

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.