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Magnetic Dirac Semimetal State of (Mn,Ge)Bi2Te4 Full article

Journal

Communications Physics
ISSN: 2399-3650

Output data

Year: 2024, Volume: 7, Number: 1, Article number : 180, Pages count : 11 DOI: 10.1038/s42005-024-01675-w

Tags

Electronic properties and materials; Magnetic properties and materials; Surfaces, interfaces and thin films; Topological insulators; Bismuth compounds; Germanium compounds; Manganese compounds; Quantum theory; Tellurium compounds

Authors

Frolov Alexander S. ^1,2 , Usachov Dmitry Yu. ^1,3,4 , Tarasov Artem V. ^1,3 , Fedorov Alexander V. ⁵ , Bokai Kirill A. ^1,3 , Klimovskikh Ilya ^1,3,6 , Stolyarov Vasily S. ^1,4 , Sergeev Anton I. ^1,7 , Lavrov Alexander N. ⁸ , Golyashov Vladimir A. ⁹ , Tereshchenko Oleg E. ^9,10 , Di Santo Giovanni ¹¹ , Petacсia Luca ¹¹ , Clark Oliver J. ⁵ , Sanchez-Barriga Jaime ^5,12 , Yashina Lada V. ^1,4,7

Affiliations

1	Center for Advanced Mesoscience and Nanotechnology, Moscow Institute of Physics and Technology, 9 Institutskiy Pereulok, Dolgoprudny 141700, Russia
2	N.N. Semenov Federal Research Center for Chemical Physics, Kosygina Street 4, Moscow 119991, Russia
3	St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
4	National University of Science and Technology MISIS, Moscow 119049, Russia
5	Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Str. 15, Berlin 12489, Germany
6	Donostia International Physics Center, 20018 San Sebastian, Spain
7	Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow 119991, Russia
8	Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Acad. Lavrentiev Ave, Novosibirsk 630090, Russian Federation
9	Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis SB RAS, 630559 Kol’tsovo, Russia
10	M.N. Mikheev Institute of Metal Physics of UB RAS, 18 S. Kovalevskaya Str., Ekaterinburg 620108, Russian Federation
11	Elettra Sincrotrone Trieste, Strada Statale 14 km 163.5, 34149 Trieste, Italy
12	IMDEA Nanoscience, 28049 Madrid, Spain

The ability to finely tune the properties of magnetic topological insulators (TIs) is crucial for quantum electronics. We studied solid solutions with a general formula GexMn1-xBi2Te4 between two isostructural Z2 TIs, magnetic MnBi2Te4 and nonmagnetic GeBi2Te4 with Z2 invariants of 1;000 and 1;001, respectively. We observed linear x-dependent magnetic properties, composition-independent pairwise exchange interactions, and topological phase transitions (TPTs) between topologically nontrivial phases and the semimetal state. The TPTs are driven purely by the variation of orbital contributions. By tracing the x-dependent Bi 6p contribution to the states near the fundamental gap, the effective spin-orbit coupling variation is extracted. The gapless state observed at x = 0.42 closely resembles a Dirac semimetal above the Néel temperature and shows a magnetic gap below, which is clearly visible in raw photoemission data. The observed behavior demonstrates an ability to precisely control topological and magnetic properties of TIs.

Frolov A.S. , Usachov D.Y. , Tarasov A.V. , Fedorov A.V. , Bokai K.A. , Klimovskikh I. , Stolyarov V.S. , Sergeev A.I. , Lavrov A.N. , Golyashov V.A. , Tereshchenko O.E. , Di Santo G. , Petacсia L. , Clark O.J. , Sanchez-Barriga J. , Yashina L.V.
Magnetic Dirac Semimetal State of (Mn,Ge)Bi2Te4
Communications Physics. 2024. V.7. N1. 180 :1-11. DOI: 10.1038/s42005-024-01675-w WOS Scopus РИНЦ OpenAlex publication_identifier_short.sciact_skif_identifier_type

Submitted:	Oct 4, 2023
Accepted:	May 24, 2024
Published online:	Jun 5, 2024
Published print:	Dec 1, 2024

Web of science:	WOS:001244360700001
Scopus:	2-s2.0-85195504848
Elibrary:	68094165
OpenAlex:	W4399369554
publication_identifier.sciact_skif_identifier_type:	3609

DB	Citing
Scopus	6
OpenAlex	6
Web of science	4
Elibrary	3