Band Gap Opening in the BiSbTeSe2 Topological Surface State Induced by Ferromagnetic Surface Reordering | Sciact - CRIS-system of Boreskov Institute of Catalysis

Band Gap Opening in the BiSbTeSe2 Topological Surface State Induced by Ferromagnetic Surface Reordering Full article

Journal

Physical Review Materials
, E-ISSN: 2475-9953

Output data

Year: 2021, Volume: 5, Number: 12, Article number : 124204, Pages count : 11 DOI: 10.1103/physrevmaterials.5.124204

Tags

Antimony compounds; Atoms; Bismuth compounds; Calculations; Electric insulators; Energy gap; Magnetization; Magnetometry; Photoelectron spectroscopy; Quantum Hall effect; Topological insulators; Topology; Vanadium compounds

Authors

Kaveev A.K. ¹ , Suturin S.M. ¹ , Golyashov V.A. ² , Kokh K.A. ³ , Eremeev S.V. ^4,5 , Estyunin D.A. ⁶ , Shikin A.M. ⁶ , Okotrub A.V. ⁷ , Lavrov A.N. ⁷ , Schwier E.F. ⁸ , Tereshchenko O.E. ^2,9

Affiliations

1	Solid state physics department, Ioffe Institute, 194021 Saint-Petersburg, Russia
2	Rzhanov Institute of Semiconductor Physics, 630090 Novosibirsk, Russia
3	Sobolev Institute of Geology and Mineralogy, 630090 Novosibirsk, Russia
4	Institute of Strength Physics and Materials Science, 634055 Tomsk, Russia
5	Tomsk State University, 634050 Tomsk, Russia
6	Saint-Petersburg State University, 198504, Saint-Petersburg, Russia
7	Nikolaev Institute of Inorganic Chemistry, SB RAS, 630090 Novosibirsk, Russia
8	Julius-Maximilians University, D-97074 Würzburg, Germany
9	Novosibirsk State University, 630090 Novosibirsk, Russia

Introducing magnetic exchange interaction into topological insulators is known to break the time-reversal symmetry and to open a gap at the Dirac point in the otherwise gapless topological surface states. This allows various novel topological quantum phenomena to be attained, including the quantum anomalous Hall effect and can lead to the emergence of the axion insulator phase. Among the different approaches, magnetic doping is an effective, but still experimentally challenging pathway to provide the magnetic exchange interaction. Here we demonstrate that epitaxial deposition of Co and Mn magnetic atoms onto the (0001) surface of the BiSbTeSe2 topological insulator with a coverage between 0.6 and 3 atoms per surface cell performed in a finely tuned temperature range of 300∘–330∘C leads to the substitution of pnictogen atoms in the surface layer with magnetic atoms and to the formation of a two-dimensional magnetic phase with out-of-plane magnetization as proved by SQUID magnetometry. This magnetic layer is responsible for the appearance of a gap in the Dirac surface state as revealed by laser-based microfocused angle-resolved photoelectron spectroscopy. Our measurements have shown that the gap exists within the temperature range of 15–100 K, where the out-of-plane magnetization persists. The presented experimental results are supported by relativistic ab initio calculations.

Kaveev A.K. , Suturin S.M. , Golyashov V.A. , Kokh K.A. , Eremeev S.V. , Estyunin D.A. , Shikin A.M. , Okotrub A.V. , Lavrov A.N. , Schwier E.F. , Tereshchenko O.E.
Band Gap Opening in the BiSbTeSe2 Topological Surface State Induced by Ferromagnetic Surface Reordering
Physical Review Materials. 2021. V.5. N12. 124204 :1-11. DOI: 10.1103/physrevmaterials.5.124204 WOS Scopus AN OpenAlex

Submitted:	Aug 19, 2021
Accepted:	Nov 29, 2021
Published print:	Dec 1, 2021
Published online:	Dec 14, 2021

Web of science:	WOS:000733386500002
Scopus:	2-s2.0-85122544842
Chemical Abstracts:	2022:109622
OpenAlex:	W4200026727

DB	Citing
Scopus	5
Web of science	5
OpenAlex	7