2024
DOI: 10.1038/s42005-024-01675-w
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Magnetic Dirac semimetal state of (Mn,Ge)Bi2Te4

Alexander S. Frolov,
Dmitry Yu. Usachov,
Artem V. Tarasov
et al.

Abstract: 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 semi… Show more

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Cited by 2 publications
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“…As the Ge concentration approaches 90%, the states of the upper cone shift back towards lower binding energies, again forming a pronounced band gap. The ARPES data then resemble those more characteristic of Mn-doped GeBi 2 Te 4 , featuring the bulk band gap and TSS branches in the region of their intersection with the edge of the VB (for comparison, see 37,38 for GeBi 2 Te 4 ).…”
Section: (B)mentioning
confidence: 73%
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“…As the Ge concentration approaches 90%, the states of the upper cone shift back towards lower binding energies, again forming a pronounced band gap. The ARPES data then resemble those more characteristic of Mn-doped GeBi 2 Te 4 , featuring the bulk band gap and TSS branches in the region of their intersection with the edge of the VB (for comparison, see 37,38 for GeBi 2 Te 4 ).…”
Section: (B)mentioning
confidence: 73%
“…The observed decrease in the band gap, culminating in an apparent zero gap with increasing Ge concentration, and the formation of a plateau with a minimum band gap in the concentration range of 45-55%, followed by a transition to the electronic structure of Mn-doped GeBi 2 Te 4 (at 90%), is consistent with previously reported data in the literature. This pattern has been observed both in systems where Mn atoms are replaced by Ge atoms 37,38 , as well as for substitutions with other Group IV elements such as Sn 36 and Pb 39 . However, the underlying reason for the formation of the minimum band gap plateau remains unclear.…”
Section: (B)mentioning
confidence: 76%
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