Topological Aspects of Antiferromagnets

Bonbien, V.; Zhuo, Fengjun; Salimath, A.; Ly, O.; Abbout, A.; Manchon, A.

doi:10.48550/arxiv.2102.01632

Cited by 3 publications

(3 citation statements)

References 444 publications

(402 reference statements)

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“…It may also occur in magnetic excitations, where it is providing fresh insights into old physics (10)(11)(12)(13). Spin waves were introduced by Felix Bloch in 1930 to account for the temperature dependence of the magnetization of ferromagnets (14).…”

Section: Introductionmentioning

confidence: 99%

Topological Magnons: A Review

McClarty

2022

Annu. Rev. Condens. Matter Phys.

128

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At sufficiently low temperatures, magnetic materials often enter correlated phases hosting collective, coherent magnetic excitations such as magnons or triplons. Drawing on the enormous progress on topological materials of the past few years, recent research has led to new insights into the geometry and topology of these magnetic excitations. Berry phases associated with magnetic dynamics can lead to observable consequences in heat and spin transport, whereas analogs of topological insulators and semimetals can arise within magnon band structures from natural magnetic couplings. Magnetic excitations offer a platform to explore the interplay of magnetic symmetries and topology, to drive topological transitions using magnetic fields; examine the effects of interactions on topological bands; and generate topologically protected spin currents at interfaces. In this review, we survey progress on all these topics, highlighting aspects of topological matter that are unique to magnon systems and the avenues yet to be fully investigated. Expected final online publication date for the Annual Review of Condensed Matter Physics, Volume 13 is March 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: Introductionmentioning

confidence: 99%

Topological Magnons: A Review

McClarty

2022

Annu. Rev. Condens. Matter Phys.

128

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“…Magnetic topological quantum states have attracted significant attentions as a fertile playground to explore intriguing quantum physics and promising applications in low-dissipation spintronics devices [1][2][3][4]. The quantum spin Hall effect (QSHE), characterized by quantized spin Hall conductance σ S xy (or nonzero Z 2 invariant) and helical gapless edge states, is protected by the time-reversal symmetry T [5][6][7][8][9] and has been observed experimentally in nonmagnetic HgTe/CdTe quantum wells [10] and WTe 2 monolayer [11].…”

Section: Introductionmentioning

confidence: 99%

Switchable quantum anomalous and spin Hall effects in honeycomb magnet EuCd₂As₂

Sun

Zou

et al. 2022

New J. Phys.

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Creating and engineering the topological features of intrinsic magnets are essential for topological spintronic applications. Here, we propose a material platform to realize the switchable topological phase transition between quantum anomalous Hall (QAH) and quantum spin Hall (QSH) effects, unlike generally used magnetic doping, by strain engineering. At equilibrium lattice parameters, the QAH effect emerges in EuCd2As2 quintuple layers with nonzero Chern number and chiral edge states. Accompanying a strain-engineered magnetic phase transition from out-of-plane ferromagnetic (FM) to in-plane antiferromagnetic (AFM) states, a topological phase transition is simultaneously achieved, resulting in the QSH effect, which is explicitly confirmed by nonzero spin Chern number and the emergence of gapless edge states, even without time-reversal symmetry. Remarkably, the obtained QSH effect is highly robust against the magnetic configurations, including FM and AFM configurations with both out-of-plane and in-plane directions, hereby promoting EuCd2As2 as a wonderful candidate for understanding and utilizing the magnetic topological states in spintronics.

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“…This feature is general to the ferromagnetic, antiferromagnetic, and canted antiferromagnetic phases, and enables the design of spin-sensitive devices, with the possibility of reversing the hinge spin polarization of the currents. Introduction.-The recent discovery of intrinsic magnetic topological insulator (TI) multilayered MnBi 2 Te 4 [1,2] has boosted the expectations for more resilient quantum anomalous Hall effect (QAHE) [3][4][5][6][7][8][9] and observability of axion insulator states [10][11][12]. The material platforms to realize the quantum anomalous Hall (QAH) phase can be classified, in a broad sense, in two-and threedimensional systems.…”

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confidence: 99%