Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study | Sciact - CRIS-system of Boreskov Institute of Catalysis

Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study Full article

Journal

Scientific Reports
, E-ISSN: 2045-2322

Output data

Year: 2017, Volume: 7, Article number : 3353, Pages count : 8 DOI: 10.1038/s41598-017-03507-0

Tags

Electronic properties and materials Magnetic properties and materials; Surfaces, interfaces and thin films; Topological matter

Authors

Klimovskikh I.I. ¹ , Shikin A.M. ¹ , Otrokov M.M. ^1,2,3 , Ernst A. ^8,10 , Rusinov I.P. ^1,2 , Tereshchenko O.E. ^1,5,6 , Golyashov V.A. ^1,5 , Sánchez-Barriga J. ⁹ , Varykhalov A.Yu. ⁹ , Rader O. ⁹ , Kokh K.A. ^1,6,7 , Chulkov E.V. ^1,2,3,4

Affiliations

1	Saint Petersburg State University, 198504, Saint Petersburg, Russia
2	Tomsk State University, 634050, Tomsk, Russia
3	Donostia International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain
4	Departamento de Física de Materiales UPV/EHU, Centro de Física de Materiales CFM - MPC and Centro Mixto CSIC-UPV/EHU, 20080 San Sebastián/Donostia, Basque Country, Spain
5	A.V. Rzhanov Institute of Semiconductor Physics, 630090, Novosibirsk, Russia
6	Novosibirsk State University, 630090, Novosibirsk, Russia
7	V.S. Sobolev Institute of Geology and Mineralogy, 630090, Novosibirsk, Russia
8	Max Planck Institute of Microstructure Physics, Weinberg 2, 06120, Halle, Germany
9	Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Strasse 15, 12489, Berlin, Germany
10	Institut für Theoretische Physik, Johannes Kepler Universität, A 4040, Linz, Austria

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.

Klimovskikh I.I. , Shikin A.M. , Otrokov M.M. , Ernst A. , Rusinov I.P. , Tereshchenko O.E. , Golyashov V.A. , Sánchez-Barriga J. , Varykhalov A.Y. , Rader O. , Kokh K.A. , Chulkov E.V.
Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study
Scientific Reports. 2017. V.7. 3353 :1-8. DOI: 10.1038/s41598-017-03507-0 WOS Scopus ANCAN PMID OpenAlex

Submitted:	Feb 7, 2017
Accepted:	Apr 28, 2017
Published online:	Jun 13, 2017
Published print:	Dec 1, 2017

Web of science:	WOS:000403140000024
Scopus:	2-s2.0-85020924348
Chemical Abstracts:	2018:1840212
Chemical Abstracts (print):	174:93725
PMID:	28611416
OpenAlex:	W2623748572

DB	Citing
Scopus	13
OpenAlex	20
Web of science	16