Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>MnBi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Te</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Li, Bing; Yan, Jiaqiang; Pajerowski, Daniel M.; Gordon, Elijah E.; Nedić, Ana-Marija; Sizyuk, Yuriy; Ke, Liqin; Orth, Peter P.; Vaknin, David; McQueeney, R. J.

doi:10.1103/physrevlett.124.167204

Cited by 118 publications

(75 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Both sets of data indicate Ising anisotropy, with the c axis as the easy axis in these two compounds. Ising anisotropy has also been suggested in MnBi 2 Te 4 by the inelastic neutron scattering measurement (28). The saturation moment measured at 7 T for MnBi 8 Te 13 is M s = 3.5(1)  B /Mn, whereas it is 3.4(1)  B /Mn for MnBi 6 Te 10 .…”

Section: Long-range Ferromagnetism and Its Strong Coupling With Chargmentioning

confidence: 84%

Realization of an intrinsic ferromagnetic topological state in MnBi ₈ Te ₁₃

et al. 2020

View full text Add to dashboard Cite

Novel magnetic topological materials pave the way for studying the interplay between band topology and magnetism. However, an intrinsically ferromagnetic topological material with only topological bands at the charge neutrality energy has so far remained elusive. Using rational design, we synthesized MnBi8Te13, a natural heterostructure with [MnBi2Te4] and [Bi2Te3] layers. Thermodynamic, transport, and neutron diffraction measurements show that despite the adjacent [MnBi2Te4] being 44.1 Å apart, MnBi8Te13 manifests long-range ferromagnetism below 10.5 K with strong coupling between magnetism and charge carriers. First-principles calculations and angle-resolved photoemission spectroscopy measurements reveal it is an axion insulator with sizable surface hybridization gaps. Our calculations further demonstrate the hybridization gap persists in the two-dimensional limit with a nontrivial Chern number. Therefore, as an intrinsic ferromagnetic axion insulator with clean low-energy band structures, MnBi8Te13 serves as an ideal system to investigate rich emergent phenomena, including the quantized anomalous Hall effect and quantized magnetoelectric effect.

show abstract

Section: Long-range Ferromagnetism and Its Strong Coupling With Chargmentioning

confidence: 84%

Realization of an intrinsic ferromagnetic topological state in MnBi ₈ Te ₁₃

et al. 2020

View full text Add to dashboard Cite

show abstract

“…On the other hand, competing magnetic interactions in can induce a number of various magnetic phases, including skyrmion ones (see Ref. 43 ). We speculate that the formation of the skyrmion-like spin textures can be generated at elevated temperatures in the Mn-Te bilayers inside SLs, like as it is in heterostructures MnTe/TI 44 .…”

Section: Resultsmentioning

confidence: 99%

Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator $${\hbox {MnBi}}_2 {\hbox {Te}}_4$$

Shikin

Estyunin

Климовских

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Modification of the gap at the Dirac point (DP) in axion antiferromagnetic topological insulator and its electronic and spin structure have been studied by angle- and spin-resolved photoemission spectroscopy (ARPES) under laser excitation at various temperatures (9–35 K), light polarizations and photon energies. We have distinguished both large (60–70 meV) and reduced ( ) gaps at the DP in the ARPES dispersions, which remain open above the Neél temperature ( ). We propose that the gap above remains open due to a short-range magnetic field generated by chiral spin fluctuations. Spin-resolved ARPES, XMCD and circular dichroism ARPES measurements show a surface ferromagnetic ordering for the “large gap” sample and apparently significantly reduced effective magnetic moment for the “reduced gap” sample. These observations can be explained by a shift of the Dirac cone (DC) state localization towards the second Mn layer due to structural disturbance and surface relaxation effects, where DC state is influenced by compensated opposite magnetic moments. As we have shown by means of ab-initio calculations surface structural modification can result in a significant modulation of the DP gap.

show abstract

“…However, other techniques such as electron energy loss spectroscopy can be, in principle, used 61 . Our work suggests the necessity of an explicit treatment of electron correlations to accurately describe the magnetism in the broad family of layered magnetic materials 62,63 , including magnetic topological vdW materials 64,65 , where the interaction between magnetization and the topological surface state is essential.…”

Section: Stacking-dependent Magnetic Orderingmentioning

confidence: 99%

Electron correlation effects on exchange interactions and spin excitations in 2D van der Waals materials

Katsnelson

2021

npj Comput Mater

Self Cite

View full text Add to dashboard Cite

Despite serious effort, the nature of the magnetic interactions and the role of electron-correlation effects in magnetic two-dimensional (2D) van der Waals materials remains elusive. Using CrI3 as a model system, we show that the calculated electronic structure including nonlocal electron correlations yields spin excitations consistent with inelastic neutron-scattering measurements. Remarkably, this approach identifies an unreported correlation-enhanced interlayer super-superexchange, which rotates the magnon Dirac lines off, and introduces a gap along the high-symmetry Γ-K-M path. This discovery provides a different perspective on the gap-opening mechanism observed in CrI3, which was previously associated with spin–orbit coupling through the Dzyaloshinskii–Moriya interaction or Kitaev interaction. Our observation elucidates the critical role of electron correlations on the spin ordering and spin dynamics in magnetic van der Waals materials and demonstrates the necessity of explicit treatment of electron correlations in the broad family of 2D magnetic materials.

show abstract

Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi2Te4

Cited by 118 publications

References 33 publications

Realization of an intrinsic ferromagnetic topological state in MnBi ₈ Te ₁₃

Realization of an intrinsic ferromagnetic topological state in MnBi ₈ Te ₁₃

Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator $${\hbox {MnBi}}_2 {\hbox {Te}}_4$$

Electron correlation effects on exchange interactions and spin excitations in 2D van der Waals materials

Contact Info

Product

Resources

About

Competing Magnetic Interactions in the Antiferromagnetic Topological Insulator MnBi2Te4

Cited by 118 publications

References 33 publications

Realization of an intrinsic ferromagnetic topological state in MnBi 8 Te 13

Realization of an intrinsic ferromagnetic topological state in MnBi 8 Te 13

Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator $${\hbox {MnBi}}_2 {\hbox {Te}}_4$$

Electron correlation effects on exchange interactions and spin excitations in 2D van der Waals materials

Contact Info

Product

Resources

About

Realization of an intrinsic ferromagnetic topological state in MnBi ₈ Te ₁₃

Realization of an intrinsic ferromagnetic topological state in MnBi ₈ Te ₁₃