Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Magnetic Dirac semimetal state of (Mn,Ge)Bi2Te4. / Frolov, Alexander S.; Усачев, Дмитрий Юрьевич; Тарасов, Артем Вячеславович; Fedorov, Alexander V.; Бокай, Кирилл Андреевич; Климовских, Илья Игоревич; Stolyarov, Vasily S.; Sergeev, Anton I.; Lavrov, Alexander N.; Golyashov, Vladimir A.; Tereshchenko, Oleg E.; Di Santo, Giovanni; Petacсia, Luca; Clark, Oliver J.; Sánchez-Barriga, Jaime; Yashina, Lada V.
в: Communications Physics, Том 7, № 1, 180, 01.12.2024.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Magnetic Dirac semimetal state of (Mn,Ge)Bi2Te4
AU - Frolov, Alexander S.
AU - Усачев, Дмитрий Юрьевич
AU - Тарасов, Артем Вячеславович
AU - Fedorov, Alexander V.
AU - Бокай, Кирилл Андреевич
AU - Климовских, Илья Игоревич
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 - Sánchez-Barriga, Jaime
AU - Yashina, Lada V.
PY - 2024/12/1
Y1 - 2024/12/1
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.mendeley.com/catalogue/2f286704-7861-3e29-bf08-4c6d7ff3987e/
U2 - 10.1038/s42005-024-01675-w
DO - 10.1038/s42005-024-01675-w
M3 - Article
VL - 7
JO - Communications Physics
JF - Communications Physics
SN - 2399-3650
IS - 1
M1 - 180
ER -
ID: 121262370