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Autorzy (20)

• AGHChrobak Maciej
• AGHMaćkosz Krzysztof
• AGHJurczyszyn Michał Leszek
• AGHDobrzański Michał
• AGHNowak Kamil
• AGHŚlęzak Tomasz
• Zając M.
• AGHSikora Marcin
• Rams M.
• Eelbo T.
• AGHStępień Joanna
• Waśniowska M.
• Mathon Olivier
• Yakhou F.
• Merkel D. G.
• Miotkowski Ireneusz
• AGHKąkol Zbigniew
• AGHKozłowski Andrzej
• AGHPrzybylski Marek
• AGHTarnawski Zbigniew

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Dane bibliometryczne

ID BaDAP	129144
Data dodania do BaDAP	2020-09-16
Tekst źródłowy	URL
DOI	10.1088/1367-2630/ab890d
Rok publikacji	2020
Typ publikacji	artykuł w czasopiśmie
Otwarty dostęp
Creative Commons
Czasopismo/seria	New Journal of Physics

Abstract

Both preserved gapless states and gapping of Dirac states due to broken time reversal symmetry in bismuth chalcogenide topological insulators with surface and bulk magnetic impurities have been observed and reported in the literature. In order to shed more light on the mechanism of such effects we have performed comprehensive element selective study of the impact of Fe impurity position in the Bi2Se3 lattice on its magnetism. The iron atoms were imbedded in the structure (volume dopants) or deposited on the surface (adatoms) and they revealed striking phenomena. Volume doping preserves non-trivial topology of Bi1.98Fe0.02Se3. Fe atoms not only substitute Bi, but also locate in van der Waals gap. The former are magnetically isotropic, while the latter reveal large magnetic moment (4.5 μ B) with perpendicular anisotropy if located near the surface. Majority of Fe adatoms on the surface of Bi2Se3 exhibit weaker moment (3.5 μ B) with in-plane anisotropy, as expected for non-interacting species. Negligible interaction between surface electronic states and magnetic adatoms is confirmed by identical vibration spectra of Fe deposited on TI surface of Bi2Se3 and non-TI surface of Bi2S3. The data gathered show how indispensable is the knowledge of the magnetic impurity distribution for applications of bismuth chalcogenide systems.

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