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Magnetic Dirac semimetal state of (Mn,Ge)Bi2Te4статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Frolov Alexander S., Usachov Dmitry Yu, Tarasov Artem V., Fedorov Alexander V., Bokai Kirill A., Klimovskikh Ilya, Stolyarov Vasily S., Sergeev Anton I., Lavrov Alexander N., Golyashov Vladimir A., Tereshchenko Oleg E., Di Santo Giovanni, Petacсia Luca, Clark Oliver J., Sanchez-Barriga Jaime, Yashina Lada V.
- Журнал: Communications Physics
- Том: 7
- Номер: 1
- Год издания: 2024
- Издательство: Springer Nature
- Местоположение издательства: Switzerland
- Номер статьи: 180
- DOI: 10.1038/s42005-024-01675-w
- Аннотация: 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 and1;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.
- Добавил в систему: Яшина Лада Валерьевна