TY - JOUR

T1 - Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI

T2 - A Combined Photoemission and Ab Initio Study

AU - Klimovskikh, I. I.

AU - Shikin, A. M.

AU - Otrokov, M. M.

AU - Ernst, A.

AU - Rusinov, I. P.

AU - Tereshchenko, O. E.

AU - Golyashov, V. A.

AU - Sánchez-Barriga, J.

AU - Varykhalov, A. Yu

AU - Rader, O.

AU - Kokh, K. A.

AU - Chulkov, E. V.

PY - 2017/6/13

Y1 - 2017/6/13

N2 - 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.

AB - 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.

KW - APPROXIMATION

KW - BULK

KW - DIRAC-FERMION

KW - ELECTRON-GAS

KW - MAJORANA FERMIONS

KW - SUPERCONDUCTOR

UR - http://www.scopus.com/inward/record.url?scp=85020924348&partnerID=8YFLogxK

U2 - 10.1038/s41598-017-03507-0

DO - 10.1038/s41598-017-03507-0

M3 - Article

C2 - 28611416

AN - SCOPUS:85020924348

VL - 7

SP - 3353

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

IS - 1

M1 - 3353

ER -