TY - JOUR
T1 - Magnetic Dirac semimetal state of (Mn,Ge)Bi2Te4
AU - Frolov, Alexander S.
AU - Usachov, Dmitry Yu
AU - Tarasov, Artem V.
AU - Fedorov, Alexander V.
AU - Bokai, Kirill A.
AU - Klimovskikh, Ilya
AU - Stolyarov, Vasily S.
AU - Sergeev, Anton I.
AU - Lavrov, Alexander N.
AU - Golyashov, Vladimir A.
AU - Tereshchenko, Oleg E.
AU - Di Santo, Giovanni
AU - Petacсia, Luca
AU - Clark, Oliver J.
AU - Sanchez-Barriga, Jaime
AU - Yashina, Lada V.
N1 - Funding Information:
The\u00A0Magnetic Force Microscopy at 4 K was partially supported by the Ministry of Science and Higher Education of the Russian Federation (No. FSMG-2023-0014). A.S.F. thank Russian Science Foundation (grant\u00A0No. 22-72-10074 https://rscf.ru/en/project/22-72-10074/)\u00A0for the support of ARPES study and synthesis. A.V.T. thank\u00A0Saint Petersburg State University (Grant No. 95442847)\u00A0for the supporting the theorethical modeling\u00A0within the KKR approach.\u00A0D.Yu.U. and V.S.S.\u00A0thank\u00A0Russian Science Foundation, Grant No. 23-72-30004 (https://rscf.ru/project/23-72-30004/) for supporting the DFT study. We thank Helmholtz-Zentrum Berlin and Elettra Sincrotrone Trieste for granting access to the beamlines UE112-PGM2a (13), RGBL, and BaDElPh, respectively, and for the provision of beamtimes. The project that gave rise to these results received the support of a fellowship from \u201Cla Caixa\u201D Foundation (ID 100010434). We appreciate Dr. Anna Makarova, Dr. Vera Neudachina, and Elena Ushakova for their participation in spectra measurements. Calculations were performed using the facilities of the Joint Supercomputer Center of the Russian Academy of Sciences.
Funding Information:
The Magnetic Force Microscopy at 4 K was partially supported by the Ministry of Science and Higher Education of the Russian Federation (No. FSMG-2023-0014). A.S.F. thank Russian Science Foundation (grant No. 22-72-10074 https://rscf.ru/en/project/22-72-10074/ ) for the support of ARPES study and synthesis. A.V.T. thank Saint Petersburg State University (Grant No. 95442847) for the supporting the theorethical modeling within the KKR approach. D.Yu.U. and V.S.S. thank Russian Science Foundation, Grant No. 23-72-30004 ( https://rscf.ru/project/23-72-30004/ ) for supporting the DFT study. We thank Helmholtz-Zentrum Berlin and Elettra Sincrotrone Trieste for granting access to the beamlines UE112-PGM2a (1), RGBL, and BaDElPh, respectively, and for the provision of beamtimes. The project that gave rise to these results received the support of a fellowship from \u201Cla Caixa\u201D Foundation (ID 100010434). We appreciate Dr. Anna Makarova, Dr. Vera Neudachina, and Elena Ushakova for their participation in spectra measurements. Calculations were performed using the facilities of the Joint Supercomputer Center of the Russian Academy of Sciences.
Publisher Copyright:
© The Author(s) 2024.
PY - 2024/6/5
Y1 - 2024/6/5
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85195504848
U2 - 10.1038/s42005-024-01675-w
DO - 10.1038/s42005-024-01675-w
M3 - Article
AN - SCOPUS:85195504848
SN - 2399-3650
VL - 7
JO - Communications Physics
JF - Communications Physics
IS - 1
M1 - 180
ER -