Topological Magnets: Functions Based on Berry Phase and Multipoles

Nakatsuji, Satoru; Arita, Ryotaro

doi:10.1146/annurev-conmatphys-031620-103859

Cited by 55 publications

(21 citation statements)

References 156 publications

(250 reference statements)

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“…Looking ahead, identifying new magnetic topological systems with suitable properties for implementing QAH effect, or exploring the interplay between magnetism and topology in general, is of paramount interest [139][140][141].…”

Section: Discussionmentioning

confidence: 99%

Progress and prospects in the quantum anomalous Hall effect

Chi¹,

Moodera²

2022

Preprint

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The quantum anomalous Hall effect refers to the quantization of Hall effect in the absence of applied magnetic field. The quantum anomalous Hall effect is of topological nature and well suited for field-free resistance metrology and low-power information processing utilizing dissipationless chiral edge transport. In this Perspective, we provide an overview of the recent achievements as well as the materials challenges and opportunities, pertaining to engineering intrinsic/interfacial magnetic coupling, that are expected to propel future development of the field.

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Section: Discussionmentioning

confidence: 99%

Progress and prospects in the quantum anomalous Hall effect

Chi¹,

Moodera²

2022

Preprint

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“…It is, therefore, a robust elementary magnetic phase. The theoretical prediction of altermagnetism thus complements in a unique fundamental way modern studies of spin quantum phases associated with more complex, and often more subtle, topological phenomena, many-body correlations, relativistic physics, or frustrated magnetic interactions [29][30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Emerging research landscape of altermagnetism

Šmejkal¹,

Sinova²,

Jungwirth³

2022

Preprint

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Magnetism is one of the largest, most fundamental, and technologically most relevant fields of condensed-matter physics. Traditionally, two basic magnetic phases have been considered -ferromagnetism and antiferromagnetism. The breaking of the time-reversal symmetry and spin splitting of the electronic states by the magnetization in ferromagnets underpins a range of macroscopic responses in this extensively explored and exploited type of magnets. By comparison, antiferromagnets have vanishing net magnetization. This Perspective reflects on recent observations of materials hosting an intriguing ferromagnetic-antiferromagnetic dichotomy, in which spin-split spectra and macroscopic observables, akin to ferromagnets, are accompanied by antiparallel magnetic order with vanishing magnetization, typical of antiferromagnets. An unconventional non-relativistic symmetry-group formalism offers a resolution of this apparent contradiction by delimiting a third basic magnetic phase, dubbed altermagnetism. Our Perspective starts with an overview of the still emerging unique phenomenology of the phase, and of the wide array of altermagnetic material candidates. In the main part of the article, we illustrate how altermagnetism can enrich our understanding of overarching condensed-matter physics concepts, and have impact on prominent condensed-matter research areas. CONTENTS I. Introduction 1 II. Altermagnetic phase 3 A. Ab initio band-structures 3 B. Symmetry classification and description 4 C. Identification rules 6 D. Material candidates 7 III. Physical concepts 9 A. Kramers theorem 9 B. Fermi-liquid instabilities 10 C. Electron and magnon quasiparticles 12 D. Berry phase and non-dissipative transport 14 IV. Research areas 15 A. Spintronics 15 B. Ultra-fast optics and neuromorphics 17 C. Thermoelectrics, field-effect electronics and multiferroics 19 D. Superconductivity 20 V. Conclusion 20 Acknowledgement 20 References 21

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“…This review article presents the recent highlights of studies on Weyl magnets and other topological magnets, which have gained global interest as examples of quantum materials. Their existence was theoretically proposed in 2011 [1], and ever since our group pioneered research by developing them experimentally [2][3][4][5][6][7], the number of such examples has been increasing [8]. Here, "quantum" indicates that the quantum phase (Berry phase) of the wavefunction is controlled through the topology of the band structure.…”

Section: Introductionmentioning

confidence: 99%

Topological magnets—their basic science and potential applications

Nakatsuji

2022

AAPPS Bull.

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The performance limitations of conventional electronic materials pose a major problem in the era of digital transformation (DX). Consequently, extensive research is being conducted on the development of quantum materials that may overcome such limitations, by utilizing quantum effects to achieve remarkable performances. In particular, considerable progress has been made on the fundamental theories of topological magnets and has had a widespread impact on related fields of applied research. An important advance in the field of quantum manipulation is the development of the technology to control the quantum phase of conduction electron wavefunctions through the spin structure. This new technology has led to the realization of phenomena that had been considered infeasible for more than a century, such as the anomalous Hall effect in antiferromagnets and the giant magneto-thermoelectric effect in ferromagnets. This review article presents the remarkable properties of Weyl antiferromagnets and topological ferromagnets, which have been discovered recently. Additionally, this paper examines the current status of how advances in the basic principles of topological magnetism are facilitating the development of next-generation technologies that support the DX era, such as energy harvesting, heat flow sensors, and ultrafast nonvolatile memory.

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Topological Magnets: Functions Based on Berry Phase and Multipoles

Cited by 55 publications

References 156 publications

Progress and prospects in the quantum anomalous Hall effect

Progress and prospects in the quantum anomalous Hall effect

Emerging research landscape of altermagnetism

Topological magnets—their basic science and potential applications

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