The elusive quantum anomalous Hall effect in MnBi2Te4: a materials perspective

Yan, Jiaqiang

doi:10.48550/arxiv.2112.09070

Cited by 2 publications

(2 citation statements)

References 24 publications

(27 reference statements)

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“…Specifically, elements such as Sn, Pb, and Ge have been investigated as potential substitutes for Mn due to their ability to form the desired ternary compounds, including SnBi

[ 18 , 19 ], PbBi

[ 20 ], and GeBi

[ 21 , 22 ], which possess crystal structures similar to MnBi

. Experimental findings have revealed that the replacement of Mn with either Pb [ 23 ], Sn [ 24 , 25 ] or Ge [ 26 , 27 ] not only reduces the magnetic moments of the system, but also induces variation in the band structure due to the changes in orbital composition of valence and conduction bands.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Mn1−xGexBi2Te4 Electronic Structure under Variation of Ge Content

Estyunina,

Shikin,

Estyunin

et al. 2023

Nanomaterials

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One of the approaches to manipulate MnBi2Te4 properties is the magnetic dilution, which inevitably affects the interplay of magnetism and band topology in the system. In this work, we carried out angle-resolved photoemission spectroscopy (ARPES) measurements and density functional theory (DFT) calculations for analysing changes in the electronic structure of Mn1−xGexBi2Te4 that occur under parameter x variation. We consider two ways of Mn/Ge substitution: (i) bulk doping of the whole system; (ii) surface doping of the first septuple layer. For the case (i), the experimental results reveal a decrease in the value of the bulk band gap, which should be reversed by an increase when the Ge concentration reaches a certain value. Ab-initio calculations show that at Ge concentrations above 50%, there is an absence of the bulk band inversion of the Te pz and Bi pz contributions at the Γ-point with significant spatial redistribution of the states at the band gap edges into the bulk, suggesting topological phase transition in the system. For case (ii) of the vertical heterostructure Mn1−xGexBi2Te4/MnBi2Te4, it was shown that an increase of Ge concentration in the first septuple layer leads to effective modulation of the Dirac gap in the absence of significant topological surface states of spatial redistribution. The results obtained indicate that surface doping compares favorably compared to bulk doping as a method for the Dirac gap value modulation.

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“…Specifically, elements such as Sn, Pb, and Ge have been investigated as potential substitutes for Mn due to their ability to form the desired ternary compounds, including SnBi

[ 18 , 19 ], PbBi

[ 20 ], and GeBi

[ 21 , 22 ], which possess crystal structures similar to MnBi

Section: Introductionmentioning

confidence: 99%

Evolution of Mn1−xGexBi2Te4 Electronic Structure under Variation of Ge Content

Estyunina,

Shikin,

Estyunin

et al. 2023

Nanomaterials

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“…To address the discrepancy between experiment and theory, several candidate mechanisms based on either surface magnetic reconstruction, surface structural relaxation, or surface-bulk band hybridization have been proposed [15,18,20,22,[28][29][30][31][32][33][34], among which the surface magnetic reconstruction is most extensively discussed. The ground state of bulk materials has the A-type anti-ferromagnetic configuration [intralayer ferromagnetic (FM) and interlayer anti-ferromagnetic (AFM)] for n = 0, 1, 2 and FM configuration for n ≥ 3 due to the intensely weakening of the interlayer AFM supersuperexchange coupling [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Momentum-inversion symmetry breaking on the Fermi surface of magnetic topological insulators

Tan,

Kaplan,

Yan

2022

Preprint

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Magnetic topological insulators (MnBi2Te4)(Bi2Te3)n were anticipated to exhibit magnetic energy gaps while recent spectroscopic studies did not observe them. Thus, magnetism on the surface is under debate. In this work, we propose another symmetry criterion to probe the surface magnetism. Because of both time-reversal symmetry-breaking and inversion symmetry-breaking, we demonstrate that the surface band structure violates momentum-inversion symmetry and leads to a three-fold rather than six-fold rotational symmetry on the Fermi surface if corresponding surface states couple strongly to the surface magnetism. Such a momentum-inversion symmetry violation is significant along the Γ − K direction for surface bands on the (0001) plane.

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The elusive quantum anomalous Hall effect in MnBi2Te4: a materials perspective

Cited by 2 publications

References 24 publications

Evolution of Mn1−xGexBi2Te4 Electronic Structure under Variation of Ge Content

Evolution of Mn1−xGexBi2Te4 Electronic Structure under Variation of Ge Content

Momentum-inversion symmetry breaking on the Fermi surface of magnetic topological insulators

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